土壤和底泥中六价铬提取与检测方法  

Extraction and Detection of Chromium(Ⅵ) in Soil and Sediment

作　　者：蔡晔 林怡雯 李月娥 林休休[2] 

机构地区：[1]苏州环境监测中心,江苏苏州215004 [2]苏州市职业大学,江苏苏州215104

出　　处：《实验室研究与探索》2015年第1期21-25,共5页Research and Exploration In Laboratory

基　　金：国家"十二五"水体污染控制与治理科技重大专项资助项目(2012ZX07506-003)

摘　　要：采用0.5 mol/L氢氧化钠和0.5 mol/L氯化钾混合液、1 mol/L氢氧化钠溶液、1 mol/L氯化钾溶液、0.5 mol/L氢氧化钠和0.28 mol/L碳酸钠混合液四种盐溶液作为提取剂,研究土壤和底泥中六价铬的最优提取方法。结果表明,0.5mol/L氢氧化钠和0.5 mol/L氯化钾混合液能够较好地提取不同类型土壤和底泥样品中的六价铬。采用连续流动分析法检测提取液中的六价铬,结果表明在置信水平(P<0.001)下,该方法与分光光度法的线性相关性较好(R2=0.965 9)且无显著性差异,能够快速、灵敏、准确地检测土壤和底泥样品中的六价铬。This study described the process of extracting Chromium（ Ⅵ） from soil and sediment samples,and detecting the Chromium（ VI） in the digestion solution by continuous flow analysis. Chromium（ Ⅵ） in soil and sediment samples were extracted with 4 extractants： 0. 5 mol / L Na OH ＋ 0. 5 mol / L KCl,1 mol / L Na OH,1 mol / L KCl and 0. 5 mol / L Na OH ＋ 0. 28 mol / L Na2CO3. It found that 0. 5 mol / L Na OH ＋ 0. 5 mol / L KCl is the most effective eatractant for operationally defining total Chromium（ Ⅵ） in various soil and sediment samples. A continuous flow analysis was applied to the rapid determination of the concentration of Chromium（ Ⅵ） in the digestion solution. The well linear correlation between the continuous flow analysis method and spectrophotometric method（ R2= 0. 965 9） were observed,and the unobvious significant difference（ P 0. 001） of these two methods indicated that continuous flow analysis showed to be a rapid,sensitive and accurate method for detection of Chromium（ Ⅵ） in soil and sediment samples.

关 键 词：六价铬 土壤 底泥 提取剂 连续流动分析法 

分 类 号：X831[环境科学与工程—环境工程]