Determination of trace cadmium by flame atomic absorption spectrometry after adsorption and enrichment with exopolymers
MAO Yan-li1,2, ZHANG Tai-zhi3, WANG Tian-hai3,TONG Sui-bao3, PAN Jian-ming1, OU Hong-xiang1, YAN Yong-sheng*1
1. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China; 2. School of Environmental and Municipal Engineering Department, Henan University of Urban Construction, Pingdingshan 467001, China; 3. Henan Fifth Construction and Installation Project Limited Company, Pingdingshan 467001, China
Abstract：The adsorption behavior of exopolymers PS-2 to cadmium, a kind of sorbent produced from Pseudomonas sp., was studied by flame atomic absorption spectrometry. As a result, a novel determination method of trace Cd（Ⅱ） in environmental water samples was proposed after concentration and separation with exopolymers PS-2 as sorbent. The results showed that when the dosage of exopolymers PS-2 was 0.30 g at pH 6.0, the adsorption rate was up to 99.5 % with static adsorption capacity of 35.97 mg/g. Cadmium adsorbed on exopolymers PS-2 could be eluted quantitatively with 10 mL of 1 mol/L HCl as the desorption reagent. The detection limit of this method was 2.4 ng/L and the relative standard deviation (RSD) was 2.5 % (c=0.3 μg/mL, n=9) for Cd（Ⅱ）. The proposed method has been applied to the determination of trace Cd（Ⅱ） in tap water and Yudai river water samples with recoveries of 95%-101%, and the results were consistent with those obtained by standard method.
毛艳丽，张太志，王天海，童绥保，潘建明，欧红香，闫永胜*. 胞外高聚物吸附富集-火焰原子吸收光谱法测定痕量镉[J]. 冶金分析, 2011, 31(6): 43-47.
MAO Yan-li, ZHANG Tai-zhi, WANG Tian-hai,TONG Sui-bao, PAN Jian-ming, OU Hong-xiang, YAN Yong-sheng*. Determination of trace cadmium by flame atomic absorption spectrometry after adsorption and enrichment with exopolymers. , 2011, 31(6): 43-47.
