摘要
采用硝酸和氨水体系为流动相,等度洗脱方式,建立了液相色谱-电感耦合等离子体质谱(LC-ICP-MS)同时测定水嘴浸泡液中超痕量六价铬和三价铬的方法。考察了不同p H值、质谱条件等因素对实验体系的影响,使用动态反应技术(DRC)消除离子干扰。通过优化实验,实现了六价铬和三价铬的分离,避免了高含量三价铬对低含量六价铬出峰的干扰。测得六价铬和三价铬的检出限分别为0.013,0.028μg/L,线性范围分别0.02-10μg/L和0.04-20μg/L,加标回收率为76.0%-116.4%,相对标准偏差(RSD)分别为1.8%和2.8%。该方法样品用量小、检出限低、快速、准确,能够满足水嘴产品的检测需求。
Abstract: A liquid chromatography- inductively coupled plasma mass spectrometric (LC -ICP- MS) method was established for the determination of chromium ( Ⅵ ) and chromium ( Ⅲ ) stripped from stopcock. By investigating pH value, ICP - MS operation conditions and parameters, the de- tection limits of chromium(Ⅵ) and chromium( Ⅲ ) were obtained to be 0. 013 μg/L and 0. 028 μg/ L, respectively. Linear ranges of chromium ( Ⅵ ) and chromium ( Ⅲ ) were 0. 02 - 10 μg/L and 0. 04 - 20 μg/L, respectively. The spiked recoveries varied from 76.0% to 116.4% , with RSDs of 1.8% - 2. 8% . The method is fast and accurate, and has a low detection limit. It is suitable for the detection requirement of stopcock products.
出处
《分析测试学报》
CAS
CSCD
北大核心
2016年第12期1639-1642,共4页
Journal of Instrumental Analysis
关键词
液相色谱-电感耦合等离子体质谱法
水嘴
六价铬
三价铬
liquid chromatography -inductively coupled plasma mass spectrometry (LC -ICP-MS)
stopcock
chromium ( VI )
chromium ( Ⅲ )