The effect of natural organic ligands on trace metal speciation in San Francisco Bay: Implications for water quality criteria

Sander, Sylvia G.; Buck, Kristen N.; Wells, Mona

doi:10.1016/j.marchem.2014.09.015

Cited by 27 publications

(19 citation statements)

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“…Table 1 show that Hg speciation was strongly influenced by pH and organic ligands of various structures and functionalities. Sander et al (2015) reported that a recognized shortcoming in some speciation models is inadequacies in the specification of interactions between trace metals and natural organic matter in some environmental settings. The strong metal binding ligands, that are naturally occurring, are often neglected in the speciation calculations.…”

Section: Resultsmentioning

confidence: 99%

“…Knowledge of metal speciation and the role of organic ligands is a key to understanding metal mobility and ecotoxicity (Ahmad et al 2012(Ahmad et al , 2014Ren et al 2015). Finding the proper stability constants between metals and ligands under specific environmental conditions is challenging in studies of metal bioavailability and toxicity (Kosmulski 2002;Pettite 2006;Ren et al 2015;Sander et al 2015).…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption process is an important step in the ultimate removal of Hg from natural waters and is an important liquid/solid interfacial reaction that is of considerable significance not only in environmental chemistry but also for industrial applications Ren et al 2015;Sander et al 2015). Thus, much research effort focused on the mechanism of adsorption of metal ions to the surfaces of hydrous oxides of A1, Fe, Mn, and Si Wang et al 1985aWang et al , 1985bBowers & Huang 1986;Helal 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Hg adsorption is dependent on the Hg species, which also determine the toxicity or bioavailability to aquatic life, rather than on the total Hg present, in natural waters (Ravichandran 2004;Ren et al 2015;Sander et al 2015). Hg speciation is greatly influenced by various environmental parameters, such as pH, pe, Hg concentration, and types and concentrations of ligand that can complex with Hg (Parker et al 1995;Ravichandran 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Metal complexes with organic ligands have molecular weights of 500-100,000 (Kalis et al 2008;Ren et al 2015;Sander et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Hg adsorption onto noncrystalline Al hydroxide as influenced by low-molecular-weight organic ligands

Yang

2016

Archives of Agronomy and Soil Science

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This study was conducted to investigate the kinetics of Hg adsorption by noncrystalline Al hydroxide as influenced by various pH conditions and cysteine (cys), glycine (gly), and citric acid (cit), which have different structures and functionalities, as low-molecular-weight organic ligands using the GEOCHEM-PC software. The influence of these organic ligands on the kinetics of Hg adsorption varied according to their concentration, structure, and functionality and pH. The adsorption of Hg followed multiple first order kinetics with initial rapid adsorption, followed by slow adsorption. Cysteine suppressed or enhanced Hg adsorption, depending on pH and its concentration. Glycine and citric acid exerted suppressing and enhancing effects, respectively, with the exception of at pH 4.5 and at lower concentrations, at which no influence was observed as compared to the control. Two mechanisms were thought to mediate the adsorption of Hg(II); specific surface complexation in the control, cysteine and glycine systems, and ligand exchange in the citric acid system. The Hg adsorption at all levels of organic ligands decreased with increasing pH, with the exception of at the higher concentration of cysteine, at which the reverse trend was observed. The influence of organic ligands on the dynamics of Hg in the freshwater environment merits further study. ARTICLE HISTORY

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Metal complexes with organic ligands have molecular weights of 500-100,000 (Kalis et al 2008;Ren et al 2015;Sander et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Hg adsorption onto noncrystalline Al hydroxide as influenced by low-molecular-weight organic ligands

Yang

2016

Archives of Agronomy and Soil Science

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Trace Metals

Middag

Zitoun

Conway

2022

Marine Analytical Chemistry

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In this chapter an overview of sampling and analytical techniques for the marine trace metals (and their stable isotope ratios) is given, focusing largely on the six bio-essential transition metals (iron, manganese, copper, nickel, zinc and cobalt). The aim of this chapter is to introduce the reader to the breadth of techniques and methods currently available to study the biogeochemical cycles of trace metals and their isotopes in the ocean. We note that we do not cover all existing and historical techniques as some are no longer used, some remain immature for trace metal studies, and some are just emerging or are still being developed. A more detailed focus on the methods used by the authors is also provided. We anticipate the continuing development and refinement of methods; as with any expanding and developing scientific field, novel strategies and techniques continuously come and go. For further background reading on marine trace metal distribution and key biogeochemical processes in the ocean, the reader is referred throughout the chapter to appropriate overviews, articles and textbooks available online, including the freely available GEOTRACES electronic atlas and data products, as well as the GEOTRACES 'cookbook'. Keywords:Marine trace metal biogeochemistry • Marine trace metal sampling • Marine trace metal sample handling • Marine trace metal analysis • Marine metal stable isotope analysis • Marine trace metal speciation analysis 3.1

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Thermodynamic Elucidation of the Relationship Chemical Species in Aqueous Soil Extracts—Phytoaccumulation

et al. 2023

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The effect of natural organic ligands on trace metal speciation in San Francisco Bay: Implications for water quality criteria

Cited by 27 publications

References 43 publications

Kinetics of Hg adsorption onto noncrystalline Al hydroxide as influenced by low-molecular-weight organic ligands

Kinetics of Hg adsorption onto noncrystalline Al hydroxide as influenced by low-molecular-weight organic ligands

Trace Metals

Thermodynamic Elucidation of the Relationship Chemical Species in Aqueous Soil Extracts—Phytoaccumulation

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