Application of Tessier-AAS to the Non-Biological Transformation Mechanism of Chemical Speciation of Lead in Red Soil in Agricultural Area of Central China
FAN Chun-hui1, ZHANG Ying-chao2, WANG Jia-hong1
1. College of Resource & Environment, Shaanxi University of Science & Technology, Xi’an 710021, China 2. College of Environment, Tsinghua University, Beijing 100084, China
Abstract:The soil contamination of heavy metals, from the areas of mine, highway, industrial area, agricultural land and so on, is nowadays a serious issue all over the world. The contamination of heavy metals in large agricultural area might lead to the decrease of products quality and economic value. Actually, the accumulation amount of heavy metals by crops is much more related to the activated speciation, which is exchangeable and able to transform to the forms of carbonates, Fe-Mn oxides, organic matter and residual. Thus, the investigation to reveal the transformation mechanism of heavy metals caused by soil conditions might be appropriate to reduce the contaminated risk to crops. The vermicular red soil from the agricultural area of central China was used as sample in the paper, and the Tessier Sequential Extraction Procedure-atomic absorption spectroscopy (AAS) was applied to discuss the chemical speciation and non-biological transformation mechanism of Pb at different conditions. The results showed: the total amount of Pb is 32.56 mg·kg-1, lower than the first level of the State Environmental Quality Standard for Soils. The Pb content of different speciation, with decreased concentration, is residual (54.55% of total Pb content), bound to Fe-Mn oxides, bound to organic matter, bound to carbonates and exchangeable. The pH value of red soil is related to the charge amount on surface of inorganic colloids and organic matter, and the water content of red soil would change the redox potential, effective for the variation of chemical speciation of Pb. The environmental factors of straw dosage and aging time could change Pb speciation, with Pb concentration of residual form the highest. The Muller Index of Igeo is 0.302 5, indicating the contribution of human activities. The Tessier Sequential Extraction Procedure-AAS is effective for the non-biological transformation mechanism identification of Pb speciation in red soil.
Key words:Pb;Acid red soil;Chemical speciation;Muller index;Transformation mechanism
范春辉1,张颖超2,王家宏1 . 基于Tessier-AAS法的华中大农区污染红土Pb赋存形态非生物转化机制研究 [J]. 光谱学与光谱分析, 2015, 35(02): 534-538.
FAN Chun-hui1, ZHANG Ying-chao2, WANG Jia-hong1 . Application of Tessier-AAS to the Non-Biological Transformation Mechanism of Chemical Speciation of Lead in Red Soil in Agricultural Area of Central China. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(02): 534-538.
[1] Giller K E, Witter E, McGrath S P. Soil Biology & Biochemistry, 2009, 41(10): 2031. [2] Sawidis T, Breuste J, Mitrovic M, et al. Environmental Pollution, 2011, 159(12): 3560. [3] Wang S L, Xu X R, Sun Y X, et al. Marine Pollution Bulletin, 2013, 76(1/2): 7. [4] Tessier A, Campbell P G C, Blsson M. Analytical Chemistry, 1979, 51(7): 844. [5] Kim K R, Gary O. Journal of Environmental Sciences, 2009, 21(11): 1532. [6] Lin S, Iqbal J, Hu R G, et al. Agriculture, Ecosystems & Environment, 2012, 146(1): 168. [7] National Standard of the People’s Republic of China (中华人民共和国国家标准). GB/T17141—1997. [8] BAO Shi-dan(鲍士旦). Analysis on Soil & Agricultural Chemistry(土壤农化分析). 3rd Edition(第3版). Beijing: China Agriculture Press(北京:中国农业出版社), 2000. 29. [9] National Standard of the People’s Republic of China (中华人民共和国国家标准). GB15618—1995. [10] State Environmental Protection Administration(国家环境保护局). The Environmental Background Value & Environmental Capability(环境背景值和环境容量研究). Beijing: Science Press(北京: 科学出版社), 1993. 37. [11] Kumar R N, Nagendran R. Chemosphere, 2007, 66(9): 1775. [12] XU Hua, CAI Zu-cong, LI Xiao-ping(徐 华, 蔡祖聪, 李小平). Acta Pedologica Sinica(土壤学报), 2000, 37(1): 70. [13] SHAN Yu-hua, LI Chang-gui, CHEN Chen, et al(单玉华, 李昌贵, 陈 晨, 等). Chinese Journal of Ecology(生态学杂志), 2008, 27(8): 1362. [14] Tu C, Zheng C R, Chen H M. Chemosphere, 2000, 41(1/2): 133. [15] FAN Wen-hong, CHEN Jun, WANG Qiong(范文宏, 陈 俊, 王 琼). Environmental Chemistry(环境化学), 2007, 26(2): 224. [16] Muller G. Geochemical Journal, 1969, 2(3): 108. [17] FAN Chun-hui, ZHANG Ying-chao, HE Lei, et al(范春辉, 张颖超, 贺 磊, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2013, 33(7): 1820.