Silver(I) Binding Properties of Organic Soil Materials Are Different from Those of Isolated Humic Substances

被引:7
作者
Kleja, Dan B. [1 ,2 ]
Nakata, Satomi [1 ,3 ]
Persson, Ingmar [4 ]
Gustafsson, Jon Petter [1 ,5 ]
机构
[1] Swedish Univ Agr Sci, Dept Soil & Environm, POB 7014, SE-75007 Uppsala, Sweden
[2] Swedish Geotech Inst, Kornhamnstorg 61, SE-11127 Stockholm, Sweden
[3] Kyoto Inst Technol, Matsugasaki Sakyo Ku, Kyoto 6068585, Japan
[4] Swedish Univ Agr Sci, Dept Chem & Biotechnol, POB 7015, SE-75007 Uppsala, Sweden
[5] KTH Royal Inst Technol, Dept Land & Water Resources Engn, SE-10044 Stockholm, Sweden
基金
美国国家卫生研究院; 瑞典研究理事会;
关键词
X-RAY-ABSORPTION; SOFT ACIDS; COORDINATION CHEMISTRY; CATION-BINDING; ION-BINDING; BASES HSAB; MATTER; SPECIATION; WATER; COMPLEXATION;
D O I
10.1021/acs.est.6b00970
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The solubility of silver(I) in many soils is controlled by complexation reactions with organic matter. In this work we have compared the ability of isolated humic and fulvic acids to bind silver(I) with that of mor and peat materials. One new data set for Suwannee River Fulvic Acid was produced, which was consistent with published data sets for isolated fulvic and humic acids. The ability of soil materials to bind silver(I) was studied as a function of pH in the range 2.5-5.0, at a wide range of silver(I)-to-soil ratios (10(-4.2) - 10(-1.9) mol kg(-1)). By calibrating the Stockholm Humic Model on the humic and fulvic acids data sets, we showed that binding of silver(I) to both types of soil materials was much stronger (up to 2 orders of magnitude) than predicted from the silver(I) binding properties of the isolated humic materials. Thus, the approach taken for many other metals, that is, to model solubility in soils by using metal and proton binding parameters derived from isolated humic and fulvic acids, cannot be used for silver(I). One possible explanation for the discrepancy could be that silver(I) predominately interacted with various biomolecules in the soil samples, instead of humic- and fulvic-acid type materials.
引用
收藏
页码:7453 / 7460
页数:8
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