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Adsorption–Desorption Characteristics of Mercury in Paddy Soils of China

^a MOE Key Lab. of Environ., Remediation and Ecosystem Health, College of Natural Resource and Environment Sciences, Zhejiang Univ., Hangzhou 310029, China
^b Dep. of Resources and Planning, Qufu Normal Univ., Jining 273165, China
^c Univ. of Florida, Inst. of Food and Agricultural Sciences, Indian River Research and Education Center, Fort Pierce, FL 34945, USA

View larger version (15K): [in this window] [in a new window]   Fig. 1. Isotherms of Hg2+ adsorption in the paddy soils. Data are means of three replications. Error bar indicates standard error.

View larger version (20K): [in this window] [in a new window]   Fig. 2. The pH changes in relation to Hg2+ adsorption in the two paddy soils. Error bar indicates standard error.

View larger version (13K): [in this window] [in a new window]   Fig. 3. Effect of initial Hg2+ concentration on Hg2+ distribution coefficient (Kd) in the two paddy soils. Data are means of three replications.

View larger version (13K): [in this window] [in a new window]   Fig. 4. The relationship between Kd and pH of adsorption equilibrium. Data are means of three replications.

View larger version (25K): [in this window] [in a new window]   Fig. 5. Fractions of five successive extractions and residual Hg2+ in the total adsorbed Hg2+ in the SLS soil. The terms D1 to D5 represent the fraction of desorbed Hg2+ from each of the five successive extractions and the residual Hg2+ represents the fraction of adsorbed Hg2+ that was not recovered by the five successive extraction with 0.01 mol L–1 KCl (pH 5.4). Data are means of three replications.

View larger version (24K): [in this window] [in a new window]   Fig. 6. Fractions of five successive extractions and residual Hg2+ in the total adsorbed Hg2+ in the YRS soil. The terms D1 to D5 represent the fraction of desorbed Hg2+ from each of the five successive extractions and the residual Hg2+ represents the fraction of adsorbed Hg2+ that was not recovered by the five successive extraction with 0.01 mol L–1 KCl (pH 5.4). Data are means of three replications.

View larger version (20K): [in this window] [in a new window]   Fig. 7. The relationship between Hg2+ adsorption and desorption. Data are means of three replications.