摘要
提出用5步连续提取法分离稻田土壤样品中汞的各种形态（水溶和可交换态、铁锰氧化物结合态、有机结合态、硝酸可溶态、残渣态）。用冷蒸气原子荧光光谱法测定总汞及各种形态汞的含量。汞的质量浓度在32．Oμg·L叫以内与荧光强度呈线性关系，方法的检出限（3s）为0．0229μg·L-1。对方法的精密度做了试验，测定值的相对标准偏差（n=10）为1．1％。以4个土壤样品为基体，用标准加入法做回收试验，测得回收率在89．0％～94．0％之间。土壤的分析结果表明：垂直方向上5种不同形态的汞含量均随深度增加而减少；水平方向上土壤中不同形态汞含量大小依次为有机结合态、硝酸可溶态、残渣态汞、铁锰氧化物结合态、可交换态。
A method of 5-step successive extraction for separation of various species of mercury [including： （a） soluble and changeable species; （b） Mn, Fe oxide combined species; （c） combined organic species; （d） HNO：- soluble species and （e） residual species in paddy field soil was proposed, and contents of the 5 species as well as the content of total mercury were determined by CV-AFS. Linear relationship between values of fluorescence intensity and mass concentration of mercury was found in the range within 32. 0 μg L 1, with detection limit （3s） of 0. 022 9 ptg L 1. Precision of the method was tested giving value of RSD （n= 10） of 1. 1. Recovery was also made by standard addition method, using 4 soil samples as matrixes, give results in the range of 89.0%--94.0%. As shown by the analytical results of the paddy field soil samples, the contents of the 5 species of mercury were decreased in samples with increase of depth of soil-sampling in vertical directions; and the magnitude of contents of the 5 species of mercury in samples sampled in the horizontal directions were found to decrease in the following order： species（ c ） 〉 （ d ） 〉 （ e ） 〉 （ b ） 〉 （ a ）.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2013年第8期920-923,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
