Cd Adsorption Properties of Components in Different Freshwater Surface Coatings:  The Important Role of Ferromanganese Oxides

• Published in: Environmental science & technology Vol. 37; no. 18; pp. 4106 - 4112
• Main Authors: Dong, Deming, Hua, Xiuyi, Li, Yu, Zhang, Jingjing, Yan, Dongxu
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 15.09.2003
• Subjects: Adsorption; Applied sciences; Biological and physicochemical phenomena; Cadmium - chemistry; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Environmental conditions; Environmental Monitoring; Exact sciences and technology; Freshwater; Iron - chemistry; Manganese - chemistry; Manganese Compounds - chemistry; Materials Testing; Natural water pollution; Oxidation; Oxides - chemistry; Pollution; Pollution, environment geology; Protons; Water Pollutants - analysis; Water treatment and pollution; Asia; China; Aluminium oxide; Cadmium; Organic matter; Iron oxide; Pollutant behavior; Heavy metal; Transport process; Sorption; Manganese oxides; Adsorption; Surface water; Lakes; Stream; Water pollution; Speciation
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/es034070s

Surface coatings developed in different natural waters were used to study the role of the composition of surface coatings in controlling Cd adsorption in aquatic environ ments. To investigate the adsorption property of each component, the method of extraction techniques followed by Cd adsorption and statistical analysis were employed. Hydroxylamine hydrochloride was used to remove Mn oxides selectively, sodium dithionite was used to remove Mn and Fe oxides, and oxalic acid was used to remove most metal oxides and part of the organic material. Adsorption of Cd to surface coatings was measured before and after extraction under controlled laboratory conditions. The observed Cd adsorptions to unextracted and extracted surface coatings were analyzed using nonlinear least-squares fitting to estimate the adsorption property of each surface coating constituent. In different waters, the relative contribution to Cd adsorption of each component was different, but in all the waters studied, ferromanganese oxides contributed most with lesser roles indicated for organic phase and Al oxides. The Cd adsorption ability of manganese oxides was significantly higher than that of the other components.