Abstract：The different speciations of cadmium in soil samples from Chengdu greenbelt were extracted by Tessier sequential extraction method. The contents of total cadmium and different speciation cadmium were determined using HG-AFS. Under optimization condition of HG-AFS and using 2% HCl as medium, and 30 g·L-1 KBH4 as reductive reagent, 1 mg·L-1 Co2+ acting together with 10 g·L-1 CH4N2S can advance the generating efficiency of cadmium compound. The effects of the coexisting elements in soil on the determination of cadmium can be reduced if certain amount of Na4P2O7, K2SO4 and BaCl2 are added. The linear range is 0-10 mg·L-1 with r=0.999 1 and the detection limit is 0.016 mg·L-1. The recovery is 97.80%-100.2% with RSD of 1.93%. The analytical method is very sensitive and accurate. The distribution of average percentage of five speciations of cadmium in experimental soil samples is: residual fraction (62.1%)＞exchangeable fraction (11.7%)＞Fe-Mn oxide-bound (9.71%)＞carbonate-bound (4.17%)＞organic-bound (3.47%). Although residual fraction is the main speciation of cadmium in soil, the content of exchangeable fraction is relatively high. Thus the bioactivity of cadmium in the research area should be recognized. The concentration of cadmium exceeds the country standard in 19 soil sample, accounting for 86.4% of all soil samples. The soil from Chengdu greenbelt located in 1st ring road, 2nd ring road and 3rd ring road was polluted to different degree. The relative pollution magnitude of them is: 2nd ring road＞1st ring road＞3rd ring road.
陈媛,曾英*,吴虹霁,王琴儿. 原子荧光光谱法测定成都市公共绿地土壤层中的镉[J]. 光谱学与光谱分析, 2008, 28(12): 2979-2983.
CHEN Yuan,ZENG Ying*,WU Hong-ji,WANG Qin-er. Determination of Cadmium by HG-AFS in Soil of Virescent Zone in Chengdu City. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(12): 2979-2983.
[1] HUANG Ji-hou(黄吉厚). Chinese J. World J. Med. Today.(世界今日医学杂志), 2002, 3(9): 854. [2] PEI Xiu-cong, XU Zhao-fa(裴秀从，徐兆发). Chinese J. Environ. Occup. Med.(环境与职业医学), 2003, 20(1): 58. [3] Tessier A, et al. Analytical Chemistry, 1979, 51(7): 844. [4] WU Cheng(吴 成). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2003, 23(5): 990. [5] Guo Xiaowei, Guo Xuming. Anal. Chim. Acta, 1955, 310: 337. [6] ZHOU Guo-hua, HUANG Huai-zeng, HE Hong-liao(周国华，黄怀曾，何红蓼). Journal of Agro-Environment Science(农业环境科学学报), 2003, 22(1): 25. [7] Ministry of Environmental Protection of the People’s Republic of China, General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China(国家环境保护部，国家质量监督检验检疫总局编). Environmental Quality Standard for Soils(土壤环境质量标准). Beijing: Science Press(北京：科学出版社), 1996. [8] ZHANG Cong(张 从). Tutorial of Environment Estimate(环境评价教程). Beijing: Chinese Environment Science Press(北京：中国环境科学出版社), 2002.
