SPE-ICP-MS联用测定地下水中的Pb、Cu、Cd和Cr

发布时间：2018-05-18 01:34

本文选题：多壁碳纳米管 + 固相萃取　；参考：《环境科学与技术》2016年S2期

【摘要】：建立了一种以多壁碳纳米管固相萃取(SPE)与电感耦合等离子体质谱法(ICP-MS)联用技术为基础的测定高盐地下水中Pb、Cu、Cd和Cr的方法。考察了溶液pH值、洗脱溶液浓度及体积、样品流速、样品体积和基体效应对测定结果的影响。结果表明:溶液pH=9,1 mol/L硝酸为洗脱剂,样品流速为2 mL/min时,多壁碳纳米管对Pb、Cu、Cd和Cr有较好的萃取效率;样品体积为50 mL,洗脱体积为2 mL时,富集倍数为25倍;钾、钠、钙、镁等基体对Pb、Cu、Cd和Cr的萃取影响不大。方法采用海水标准物质CASS-5和GBW(E)080040进行了验证,结果令人满意。在最佳条件下,Pb、Cu、Cd和Cr的检出限分别为3、10、7和15 ng/L,1μg/L Pb、Cu、Cd和Cr混合溶液7次平行实验的相对标准偏差均3%。
[Abstract]:A new method for the determination of CD and Cr in high salt groundwater by inductively coupled plasma mass spectrometry (ICP-MS) and solid-phase extraction (SPE) with multi-walled carbon nanotubes (MCNTs) was developed. The effects of pH value, elution concentration and volume, sample flow rate, sample volume and matrix effect on the results were investigated. The results showed that when pH 9 mol/L nitric acid was used as eluant and the flow rate of sample was 2 mL/min, the extraction efficiency of CD and Cr was better by multiwalled carbon nanotubes, the concentration ratio of potassium, sodium and calcium was 25 times when the volume of sample was 50 mL and the volume of elution was 2 mL. Magnesium and other substrates have little effect on the extraction of CD and Cr. The method was verified by CASS-5 and GBW(E)080040, and the results were satisfactory. Under the optimum conditions, the detection limits of CD and Cr in the mixed solution of PbCU / Cu and Cr are 3107 and 15ng / L respectively. The relative standard deviations are 3 for 7 parallel experiments of mixed solution of Pb ~ (2 +) Cu ~ (2 +) CD and Cr in 1 渭 g / L ~ (-1) 渭 g 路L ~ (-1) 渭 g 路L ~ (-1).
【作者单位】：江苏省地质调查研究院;
【基金】：长三角典型地面沉降区水土污染监测与防治技术研发与示范(201111021)资助
【分类号】：X832

【相似文献】