STUDY ON THE CONTENT OF LEAD IN SOIL AND ITS CHEMICAL SPECIATION
摘 要
对广州市黄埔港区所取土壤中铅的化学形态分析进行了研究.采用含不同组分提取剂的连续提取程序对1 g土壤进行提取,使之分成8种形态的铅,并用火焰原子吸收光谱法(FAAS)对每种提取所得的形态中的铅进行了测定.另在一份试样中直接测定其总铅量,对提取剂的组成及其溶液的浓度及提取操作条件进行了研究和优化,对FAAS测定方法的仪器工作条件作了说明.试验结果表明,所取试样中大部分铅以稳定的结合形态存在,以可交换态和碳酸盐结合态存在的铅仅达6%,总铅量随土壤深度的增加而减少.FAAS测定方法的灵敏度和检出限依次为0.007 mg·L-1及0.01 mg·L-1,分析和测定了4个试样中8种形态的铅量,其加和量为147.9 mg·kg-1,与直接测得的总铅量(159.9 mg·kg-1)之间的偏差小于10%.
Abstract
A study on the chemical speciation of lead in soil taken from Huangpu port district in Guangzhou was performed and reported in this paper.A successive extraction program using different extractants was applied to 1 gram of soil sample to separate the lead into 8 different species and lead content in each of the extracted species was determined by FAAS.The composition and concentration of the extractants,and the working conditions of the extraction procedure were studied and optimized.The optimum instrumental parameters used in the FAAS determination were described.As shown by experimental results,most of lead in soil sample taken were present in the form of stable species.Lead present as the exchangeable species and as the carbonate combined species amounted only around 6%,the amounts of total lead decreased with the increase of depth of soil.The sensitivity and detection limit of the FAAS method were found to be 0.007 mg·L-1 and 0.01 mg·L-1 respectively.The sum of lead found in 8 species of 4 samples were 147.9 mg·kg-1 the deviation of which were less than 10% of the value of total lead (159.9 mg·kg-1) found directly in the sample.
中图分类号 O657.31
所属栏目 试验与研究
基金项目
收稿日期 2005/10/18
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备注赵秋香(1976-),女,湖南衡阳人,硕士,工程师,研究方向为环境化学研究.
引用该论文: ZHANG Han-ping,ZHAO Qiu-xiang,ZHANG Xue-rong,HUANG Yan-bo,LI Hai-ping,ZHANG Hua-xin,ZHAO Wen-hai. STUDY ON THE CONTENT OF LEAD IN SOIL AND ITS CHEMICAL SPECIATION[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2006, 42(9): 705~708
张汉萍,赵秋香,张雪容,黄艳波,李海萍,张华新,赵文海. 土壤中铅的含量及其化学形态分析[J]. 理化检验-化学分册, 2006, 42(9): 705~708
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【2】陈怀满,陈能场,陈英旭,等.土壤圈物质循环专著——土壤植物系统中的重金属污染[M].北京:科学出版社,1996:201.
【3】陈树元,唐肖玫.矿物物相分析[M].北京:冶金工业出版社,1959:118-123.
【4】Le Riche,H H,Weir A H.A method of studying trace elements of soil fractions[J].J Soil Sci,1963,14(2):225-235.
【5】Shuman L M.Zinc manganese and copper in soil fractions[J].Soil Sci,1979,127(1):10-17.
【6】Shuman L M.Sodium hypochlorite methods for extracting microelements associated with soil organic matter[J].Soil Sci Soc Am J,1983,47:656-660.
【7】Iyengar S S,Martens D C,Miller W P.Distribution and plant availability of soil zinc fractions[J].Soil Sci Soc Am J,1981,45:735-739.
【8】卢瑛,龚子同,张甘霖.南京城市土壤铅的含量及其化学形态[J].环境科学学报,2002,22(2):156-160.
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