Characterization of copper(II) binding by molecular weight fractions of a soil fulvic acid

Persistent Link:
http://hdl.handle.net/10150/278240
Title:
Characterization of copper(II) binding by molecular weight fractions of a soil fulvic acid
Author:
Meyer, Thomas Mark, 1962-
Issue Date:
1992
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Cu(II) binding characteristics of bulk, <30,000, <10,000, <5,000, <1,000, and <500 dalton molecular weight (MW) fractions of soil fulvic acid were determined from Cu(II)/dissolved organic matter interactions. Manual complexometric and potentiometric titrations measured Cu(II) MW fraction binding capacities and acidities. Ionic strength, temperature, and pH were varied. Cu averaged 7.3 x 10⁻⁴ micromoles per liter and carbon ranged between 0.5 and 3.5 ppm. Total Cu(II) binding capacity differed among all but bulk and <30,000 fractions due to site concentration differences; binding was insignificant for the <500 fraction. A three-site discrete ligand model determined conditional stability constants 10⁷˙⁰ 10¹¹˙⁰ and 10¹³˙⁸ and site concentrations 1.8 x 10⁻⁶ 8.5 x 10⁻⁶ and 7.6 x 10⁻⁵ M L⁻¹ for the bulk and 30,000 fractions (pH 6.2, 0.01 M, 22°C). Similar stability constants were determined for lower MW fractions. Cu(II) complexation capacity was pH-dependent; Ionic strength effects were significant at pH 7.0, not at 6.2. Temperature effects were insignificant.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Agriculture, Agronomy.; Hydrology.; Chemistry, Organic.; Environmental Sciences.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College
Degree Grantor:
University of Arizona
Advisor:
Conklin, Martha H.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleCharacterization of copper(II) binding by molecular weight fractions of a soil fulvic aciden_US
dc.creatorMeyer, Thomas Mark, 1962-en_US
dc.contributor.authorMeyer, Thomas Mark, 1962-en_US
dc.date.issued1992en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractCu(II) binding characteristics of bulk, <30,000, <10,000, <5,000, <1,000, and <500 dalton molecular weight (MW) fractions of soil fulvic acid were determined from Cu(II)/dissolved organic matter interactions. Manual complexometric and potentiometric titrations measured Cu(II) MW fraction binding capacities and acidities. Ionic strength, temperature, and pH were varied. Cu averaged 7.3 x 10⁻⁴ micromoles per liter and carbon ranged between 0.5 and 3.5 ppm. Total Cu(II) binding capacity differed among all but bulk and <30,000 fractions due to site concentration differences; binding was insignificant for the <500 fraction. A three-site discrete ligand model determined conditional stability constants 10⁷˙⁰ 10¹¹˙⁰ and 10¹³˙⁸ and site concentrations 1.8 x 10⁻⁶ 8.5 x 10⁻⁶ and 7.6 x 10⁻⁵ M L⁻¹ for the bulk and 30,000 fractions (pH 6.2, 0.01 M, 22°C). Similar stability constants were determined for lower MW fractions. Cu(II) complexation capacity was pH-dependent; Ionic strength effects were significant at pH 7.0, not at 6.2. Temperature effects were insignificant.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectAgriculture, Agronomy.en_US
dc.subjectHydrology.en_US
dc.subjectChemistry, Organic.en_US
dc.subjectEnvironmental Sciences.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorConklin, Martha H.en_US
dc.identifier.proquest1351318en_US
dc.identifier.bibrecord.b27148130en_US
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