Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C

Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_...
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Autor*in:	Zhu, Y. N. [verfasserIn] Zhang, X. H. Xie, Q. L. Wang, D. Q. Cheng, G. W.

Format:	Artikel
Sprache:	Englisch

Erschienen:	2006

Schlagwörter:	calcium arsenates free energies of forming solubility products stability

Systematik:	ZC 7520 ZC 7520

Anmerkung:	© Springer Science + Business Media, Inc. 2006

Übergeordnetes Werk:	Enthalten in: Water, air & soil pollution - Kluwer Academic Publishers, 1971, 169(2006), 1-4 vom: Jan., Seite 221-238
Übergeordnetes Werk:	volume:169 ; year:2006 ; number:1-4 ; month:01 ; pages:221-238

Links:	Volltext

DOI / URN:	10.1007/s11270-006-2099-y

Katalog-ID:	OLC2084493242

Internformat


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520			\|a Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol.
650		4	\|a calcium arsenates
650		4	\|a free energies of forming
650		4	\|a solubility products
650		4	\|a stability
700	1		\|a Zhang, X. H. \|4 aut
700	1		\|a Xie, Q. L. \|4 aut
700	1		\|a Wang, D. Q. \|4 aut
700	1		\|a Cheng, G. W. \|4 aut
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Indexfelder

author_variant	y n z yn ynz x h z xh xhz q l x ql qlx d q w dq dqw g w c gw gwc
matchkey_str	article:00496979:2006----::ouiiynsaiiyfacua
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allfields	10.1007/s11270-006-2099-y doi (DE-627)OLC2084493242 (DE-He213)s11270-006-2099-y-p DE-627 ger DE-627 rakwb eng 570 333.7 VZ 12 13 ssgn BIODIV DE-30 fid ZC 7520 VZ rvk ZC 7520 VZ rvk Zhu, Y. N. verfasserin aut Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C 2006 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science + Business Media, Inc. 2006 Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol. calcium arsenates free energies of forming solubility products stability Zhang, X. H. aut Xie, Q. L. aut Wang, D. Q. aut Cheng, G. W. aut Enthalten in Water, air & soil pollution Kluwer Academic Publishers, 1971 169(2006), 1-4 vom: Jan., Seite 221-238 (DE-627)12929134X (DE-600)120499-3 (DE-576)014472643 0049-6979 nnns volume:169 year:2006 number:1-4 month:01 pages:221-238 https://doi.org/10.1007/s11270-006-2099-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-FOR SSG-OLC-IBL SSG-OPC-GGO GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4082 GBV_ILN_4219 GBV_ILN_4309 GBV_ILN_4313 ZC 7520 ZC 7520 AR 169 2006 1-4 01 221-238
spelling	10.1007/s11270-006-2099-y doi (DE-627)OLC2084493242 (DE-He213)s11270-006-2099-y-p DE-627 ger DE-627 rakwb eng 570 333.7 VZ 12 13 ssgn BIODIV DE-30 fid ZC 7520 VZ rvk ZC 7520 VZ rvk Zhu, Y. N. verfasserin aut Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C 2006 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science + Business Media, Inc. 2006 Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol. calcium arsenates free energies of forming solubility products stability Zhang, X. H. aut Xie, Q. L. aut Wang, D. Q. aut Cheng, G. W. aut Enthalten in Water, air & soil pollution Kluwer Academic Publishers, 1971 169(2006), 1-4 vom: Jan., Seite 221-238 (DE-627)12929134X (DE-600)120499-3 (DE-576)014472643 0049-6979 nnns volume:169 year:2006 number:1-4 month:01 pages:221-238 https://doi.org/10.1007/s11270-006-2099-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-FOR SSG-OLC-IBL SSG-OPC-GGO GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4082 GBV_ILN_4219 GBV_ILN_4309 GBV_ILN_4313 ZC 7520 ZC 7520 AR 169 2006 1-4 01 221-238
allfields_unstemmed	10.1007/s11270-006-2099-y doi (DE-627)OLC2084493242 (DE-He213)s11270-006-2099-y-p DE-627 ger DE-627 rakwb eng 570 333.7 VZ 12 13 ssgn BIODIV DE-30 fid ZC 7520 VZ rvk ZC 7520 VZ rvk Zhu, Y. N. verfasserin aut Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C 2006 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science + Business Media, Inc. 2006 Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol. calcium arsenates free energies of forming solubility products stability Zhang, X. H. aut Xie, Q. L. aut Wang, D. Q. aut Cheng, G. W. aut Enthalten in Water, air & soil pollution Kluwer Academic Publishers, 1971 169(2006), 1-4 vom: Jan., Seite 221-238 (DE-627)12929134X (DE-600)120499-3 (DE-576)014472643 0049-6979 nnns volume:169 year:2006 number:1-4 month:01 pages:221-238 https://doi.org/10.1007/s11270-006-2099-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-FOR SSG-OLC-IBL SSG-OPC-GGO GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4082 GBV_ILN_4219 GBV_ILN_4309 GBV_ILN_4313 ZC 7520 ZC 7520 AR 169 2006 1-4 01 221-238
allfieldsGer	10.1007/s11270-006-2099-y doi (DE-627)OLC2084493242 (DE-He213)s11270-006-2099-y-p DE-627 ger DE-627 rakwb eng 570 333.7 VZ 12 13 ssgn BIODIV DE-30 fid ZC 7520 VZ rvk ZC 7520 VZ rvk Zhu, Y. N. verfasserin aut Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C 2006 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science + Business Media, Inc. 2006 Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol. calcium arsenates free energies of forming solubility products stability Zhang, X. H. aut Xie, Q. L. aut Wang, D. Q. aut Cheng, G. W. aut Enthalten in Water, air & soil pollution Kluwer Academic Publishers, 1971 169(2006), 1-4 vom: Jan., Seite 221-238 (DE-627)12929134X (DE-600)120499-3 (DE-576)014472643 0049-6979 nnns volume:169 year:2006 number:1-4 month:01 pages:221-238 https://doi.org/10.1007/s11270-006-2099-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-FOR SSG-OLC-IBL SSG-OPC-GGO GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4082 GBV_ILN_4219 GBV_ILN_4309 GBV_ILN_4313 ZC 7520 ZC 7520 AR 169 2006 1-4 01 221-238
allfieldsSound	10.1007/s11270-006-2099-y doi (DE-627)OLC2084493242 (DE-He213)s11270-006-2099-y-p DE-627 ger DE-627 rakwb eng 570 333.7 VZ 12 13 ssgn BIODIV DE-30 fid ZC 7520 VZ rvk ZC 7520 VZ rvk Zhu, Y. N. verfasserin aut Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C 2006 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science + Business Media, Inc. 2006 Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol. calcium arsenates free energies of forming solubility products stability Zhang, X. H. aut Xie, Q. L. aut Wang, D. Q. aut Cheng, G. W. aut Enthalten in Water, air & soil pollution Kluwer Academic Publishers, 1971 169(2006), 1-4 vom: Jan., Seite 221-238 (DE-627)12929134X (DE-600)120499-3 (DE-576)014472643 0049-6979 nnns volume:169 year:2006 number:1-4 month:01 pages:221-238 https://doi.org/10.1007/s11270-006-2099-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-FOR SSG-OLC-IBL SSG-OPC-GGO GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4082 GBV_ILN_4219 GBV_ILN_4309 GBV_ILN_4313 ZC 7520 ZC 7520 AR 169 2006 1-4 01 221-238
language	English
source	Enthalten in Water, air & soil pollution 169(2006), 1-4 vom: Jan., Seite 221-238 volume:169 year:2006 number:1-4 month:01 pages:221-238
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topic_facet	calcium arsenates free energies of forming solubility products stability
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authorswithroles_txt_mv	Zhu, Y. N. @@aut@@ Zhang, X. H. @@aut@@ Xie, Q. L. @@aut@@ Wang, D. Q. @@aut@@ Cheng, G. W. @@aut@@
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N.</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2006</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">ohne Hilfsmittel zu benutzen</subfield><subfield code="b">n</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Band</subfield><subfield code="b">nc</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="500" ind1=" " ind2=" "><subfield code="a">© Springer Science + Business Media, Inc. 2006</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">calcium arsenates</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">free energies of forming</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">solubility products</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">stability</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Zhang, X. H.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Xie, Q. L.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Wang, D. 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author	Zhu, Y. N.
spellingShingle	Zhu, Y. N. ddc 570 ssgn 12 fid BIODIV rvk ZC 7520 misc calcium arsenates misc free energies of forming misc solubility products misc stability Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C
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topic_title	570 333.7 VZ 12 13 ssgn BIODIV DE-30 fid ZC 7520 VZ rvk Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C calcium arsenates free energies of forming solubility products stability
topic	ddc 570 ssgn 12 fid BIODIV rvk ZC 7520 misc calcium arsenates misc free energies of forming misc solubility products misc stability
topic_unstemmed	ddc 570 ssgn 12 fid BIODIV rvk ZC 7520 misc calcium arsenates misc free energies of forming misc solubility products misc stability
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title	Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C
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title_full	Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C
author_sort	Zhu, Y. N.
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author_browse	Zhu, Y. N. Zhang, X. H. Xie, Q. L. Wang, D. Q. Cheng, G. W.
container_volume	169
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doi_str_mv	10.1007/s11270-006-2099-y
dewey-full	570 333.7
title_sort	solubility and stability of calcium arsenates at $ 25^{∘} $c
title_auth	Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C
abstract	Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol. © Springer Science + Business Media, Inc. 2006
abstractGer	Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol. © Springer Science + Business Media, Inc. 2006
abstract_unstemmed	Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol. © Springer Science + Business Media, Inc. 2006
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title_short	Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C
url	https://doi.org/10.1007/s11270-006-2099-y
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author2	Zhang, X. H. Xie, Q. L. Wang, D. Q. Cheng, G. W.
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up_date	2024-07-04T03:00:41.412Z
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N.</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2006</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">ohne Hilfsmittel zu benutzen</subfield><subfield code="b">n</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Band</subfield><subfield code="b">nc</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="500" ind1=" " ind2=" "><subfield code="a">© Springer Science + Business Media, Inc. 2006</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract The solubility and stability of calcium arsenates at 25 ∘C was determined by both precipitation and dissolution experiments. $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were identified in our experiment over a wide range of pH and for Ca/As molar ratios between 1.25 and 4.0. The solids precipitated at pH = 3 ∼ 7 and Ca/As = 1.5 were phase-pure and well-crystallized $ Ca_{3} $($ AsO_{4} $)2⋅ $ xH_{2} $O(c) and had relatively larger grain size than those formed at pH > 7. Based on the analytical results and using the computer program PHREEQC, the solubility products for $ Ca_{3} $($ AsO_{4} $)2⋅ $ 3H_{2} $O(c), $ Ca_{3} $($ AsO_{4} $)2⋅ $ 2^{1} $/4$ H_{2} $O(c), $ Ca_{5} $($ AsO_{4} $)3(OH)(c) and $ Ca_{4} $(OH)2($ AsO_{4} $)2⋅ $ 4H_{2} $O(c) were calculated as Ksp of $ 10^{− 21.14} $($ 10^{− 20.01} $ ∼ $ 10^{− 22.02} $), $ 10^{− 21.40} $($ 10^{− 20.08} $ ∼ $ 10^{− 21.98} $), $ 10^{− 40.12} $($ 10^{− 37.53} $ ∼ $ 10^{− 42.72} $) and $ 10^{− 27.49} $($ 10^{− 26.10} $ ∼ $ 10^{− 28.91} $), respectively. Correspondingly, the free energies of forming (Δ Gfo) of these calcium arsenates were calculated to be −3787.87 kJ/mol, −3611.50 kJ/mol, −5096.47 kJ/mol and −4928.86 kJ/mol.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">calcium arsenates</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">free energies of forming</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">solubility products</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">stability</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Zhang, X. H.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Xie, Q. L.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Wang, D. 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Solubility and Stability of Calcium Arsenates at $ 25^{∘} $C

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