Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria

Abstract Deterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is pa...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Umeh, Theresa C. [verfasserIn] Nduka, John K. [verfasserIn] Akpomie, Kovo G. [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2021

Schlagwörter:	Adsorption Heavy metals Ultisol Farming site Isotherm Kinetics

Übergeordnetes Werk:	Enthalten in: Applied water science - Berlin : Springer, 2011, 11(2021), 4 vom: Apr.
Übergeordnetes Werk:	volume:11 ; year:2021 ; number:4 ; month:04

Links:	Volltext

DOI / URN:	10.1007/s13201-021-01402-8

Katalog-ID:	SPR043693458

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520			\|a Abstract Deterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of $ Pb^{2+} $ and $ Cd^{2+} $ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the $ Pb^{2+} $ and $ Cd^{2+} $ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients ($ Pb^{2+} $, 0.935 and $ Cd^{2+} $, 0.971). On the basis of sorption capacity mechanism of the soil, pseudo-second-order model best described the kinetics of both metal ions retention process. The results of the present study indicated that the soil being a low cost-effective adsorbent can be utilized to minimize the environmental risk impact of these metal ions.
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spelling	10.1007/s13201-021-01402-8 doi (DE-627)SPR043693458 (DE-599)SPRs13201-021-01402-8-e (SPR)s13201-021-01402-8-e DE-627 ger DE-627 rakwb eng 550 ASE Umeh, Theresa C. verfasserin aut Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Deterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of $ Pb^{2+} $ and $ Cd^{2+} $ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the $ Pb^{2+} $ and $ Cd^{2+} $ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients ($ Pb^{2+} $, 0.935 and $ Cd^{2+} $, 0.971). On the basis of sorption capacity mechanism of the soil, pseudo-second-order model best described the kinetics of both metal ions retention process. The results of the present study indicated that the soil being a low cost-effective adsorbent can be utilized to minimize the environmental risk impact of these metal ions. Adsorption (dpeaa)DE-He213 Heavy metals (dpeaa)DE-He213 Ultisol (dpeaa)DE-He213 Farming site (dpeaa)DE-He213 Isotherm (dpeaa)DE-He213 Kinetics (dpeaa)DE-He213 Nduka, John K. verfasserin aut Akpomie, Kovo G. verfasserin aut Enthalten in Applied water science Berlin : Springer, 2011 11(2021), 4 vom: Apr. (DE-627)64730242X (DE-600)2594789-8 2190-5495 nnns volume:11 year:2021 number:4 month:04 https://dx.doi.org/10.1007/s13201-021-01402-8 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2021 4 04
allfields_unstemmed	10.1007/s13201-021-01402-8 doi (DE-627)SPR043693458 (DE-599)SPRs13201-021-01402-8-e (SPR)s13201-021-01402-8-e DE-627 ger DE-627 rakwb eng 550 ASE Umeh, Theresa C. verfasserin aut Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Deterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of $ Pb^{2+} $ and $ Cd^{2+} $ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the $ Pb^{2+} $ and $ Cd^{2+} $ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients ($ Pb^{2+} $, 0.935 and $ Cd^{2+} $, 0.971). On the basis of sorption capacity mechanism of the soil, pseudo-second-order model best described the kinetics of both metal ions retention process. The results of the present study indicated that the soil being a low cost-effective adsorbent can be utilized to minimize the environmental risk impact of these metal ions. Adsorption (dpeaa)DE-He213 Heavy metals (dpeaa)DE-He213 Ultisol (dpeaa)DE-He213 Farming site (dpeaa)DE-He213 Isotherm (dpeaa)DE-He213 Kinetics (dpeaa)DE-He213 Nduka, John K. verfasserin aut Akpomie, Kovo G. verfasserin aut Enthalten in Applied water science Berlin : Springer, 2011 11(2021), 4 vom: Apr. (DE-627)64730242X (DE-600)2594789-8 2190-5495 nnns volume:11 year:2021 number:4 month:04 https://dx.doi.org/10.1007/s13201-021-01402-8 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2021 4 04
allfieldsGer	10.1007/s13201-021-01402-8 doi (DE-627)SPR043693458 (DE-599)SPRs13201-021-01402-8-e (SPR)s13201-021-01402-8-e DE-627 ger DE-627 rakwb eng 550 ASE Umeh, Theresa C. verfasserin aut Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Deterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of $ Pb^{2+} $ and $ Cd^{2+} $ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the $ Pb^{2+} $ and $ Cd^{2+} $ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients ($ Pb^{2+} $, 0.935 and $ Cd^{2+} $, 0.971). On the basis of sorption capacity mechanism of the soil, pseudo-second-order model best described the kinetics of both metal ions retention process. The results of the present study indicated that the soil being a low cost-effective adsorbent can be utilized to minimize the environmental risk impact of these metal ions. Adsorption (dpeaa)DE-He213 Heavy metals (dpeaa)DE-He213 Ultisol (dpeaa)DE-He213 Farming site (dpeaa)DE-He213 Isotherm (dpeaa)DE-He213 Kinetics (dpeaa)DE-He213 Nduka, John K. verfasserin aut Akpomie, Kovo G. verfasserin aut Enthalten in Applied water science Berlin : Springer, 2011 11(2021), 4 vom: Apr. (DE-627)64730242X (DE-600)2594789-8 2190-5495 nnns volume:11 year:2021 number:4 month:04 https://dx.doi.org/10.1007/s13201-021-01402-8 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2021 4 04
allfieldsSound	10.1007/s13201-021-01402-8 doi (DE-627)SPR043693458 (DE-599)SPRs13201-021-01402-8-e (SPR)s13201-021-01402-8-e DE-627 ger DE-627 rakwb eng 550 ASE Umeh, Theresa C. verfasserin aut Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Deterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of $ Pb^{2+} $ and $ Cd^{2+} $ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the $ Pb^{2+} $ and $ Cd^{2+} $ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients ($ Pb^{2+} $, 0.935 and $ Cd^{2+} $, 0.971). On the basis of sorption capacity mechanism of the soil, pseudo-second-order model best described the kinetics of both metal ions retention process. The results of the present study indicated that the soil being a low cost-effective adsorbent can be utilized to minimize the environmental risk impact of these metal ions. Adsorption (dpeaa)DE-He213 Heavy metals (dpeaa)DE-He213 Ultisol (dpeaa)DE-He213 Farming site (dpeaa)DE-He213 Isotherm (dpeaa)DE-He213 Kinetics (dpeaa)DE-He213 Nduka, John K. verfasserin aut Akpomie, Kovo G. verfasserin aut Enthalten in Applied water science Berlin : Springer, 2011 11(2021), 4 vom: Apr. (DE-627)64730242X (DE-600)2594789-8 2190-5495 nnns volume:11 year:2021 number:4 month:04 https://dx.doi.org/10.1007/s13201-021-01402-8 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2021 4 04
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source	Enthalten in Applied water science 11(2021), 4 vom: Apr. volume:11 year:2021 number:4 month:04
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topic_facet	Adsorption Heavy metals Ultisol Farming site Isotherm Kinetics
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authorswithroles_txt_mv	Umeh, Theresa C. @@aut@@ Nduka, John K. @@aut@@ Akpomie, Kovo G. @@aut@@
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Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of $ Pb^{2+} $ and $ Cd^{2+} $ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the $ Pb^{2+} $ and $ Cd^{2+} $ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients ($ Pb^{2+} $, 0.935 and $ Cd^{2+} $, 0.971). 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author	Umeh, Theresa C.
spellingShingle	Umeh, Theresa C. ddc 550 misc Adsorption misc Heavy metals misc Ultisol misc Farming site misc Isotherm misc Kinetics Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria
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topic_title	550 ASE Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria Adsorption (dpeaa)DE-He213 Heavy metals (dpeaa)DE-He213 Ultisol (dpeaa)DE-He213 Farming site (dpeaa)DE-He213 Isotherm (dpeaa)DE-He213 Kinetics (dpeaa)DE-He213
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title	Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria
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title_full	Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria
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author_browse	Umeh, Theresa C. Nduka, John K. Akpomie, Kovo G.
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title_sort	kinetics and isotherm modeling of pb(ii) and cd(ii) sequestration from polluted water onto tropical ultisol obtained from enugu nigeria
title_auth	Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria
abstract	Abstract Deterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of $ Pb^{2+} $ and $ Cd^{2+} $ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the $ Pb^{2+} $ and $ Cd^{2+} $ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients ($ Pb^{2+} $, 0.935 and $ Cd^{2+} $, 0.971). On the basis of sorption capacity mechanism of the soil, pseudo-second-order model best described the kinetics of both metal ions retention process. The results of the present study indicated that the soil being a low cost-effective adsorbent can be utilized to minimize the environmental risk impact of these metal ions.
abstractGer	Abstract Deterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of $ Pb^{2+} $ and $ Cd^{2+} $ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the $ Pb^{2+} $ and $ Cd^{2+} $ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients ($ Pb^{2+} $, 0.935 and $ Cd^{2+} $, 0.971). On the basis of sorption capacity mechanism of the soil, pseudo-second-order model best described the kinetics of both metal ions retention process. The results of the present study indicated that the soil being a low cost-effective adsorbent can be utilized to minimize the environmental risk impact of these metal ions.
abstract_unstemmed	Abstract Deterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of $ Pb^{2+} $ and $ Cd^{2+} $ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the $ Pb^{2+} $ and $ Cd^{2+} $ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients ($ Pb^{2+} $, 0.935 and $ Cd^{2+} $, 0.971). On the basis of sorption capacity mechanism of the soil, pseudo-second-order model best described the kinetics of both metal ions retention process. The results of the present study indicated that the soil being a low cost-effective adsorbent can be utilized to minimize the environmental risk impact of these metal ions.
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title_short	Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria
url	https://dx.doi.org/10.1007/s13201-021-01402-8
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up_date	2024-07-03T20:16:22.999Z
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Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria

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