CAJ | 학술논문

多接收杯电感耦合等离子体质谱仪（MC-ICP-MS）因操作简单、Cr 用量少和省时等特点，已成为测定铬同位素组成的一种发展趋势。通过对水样中 Cr 的回收率、干扰离子的去除、进样方式的研究，建立了基于 MC-ICP-MS 的水环境中铬同位素的测试方法。进而通过测定标准物质 SRM 979的铬同位素组成，验证了该分析技术的可靠性和准确性。结果表明，21组 SRM 979的53 Cr／52 Cr 加权平均值为0．11341±0．00002（53 Cr／52 Cr 推荐值为0．11339±0．00015），精度为±0．17‰（2σ，95％置信度），达到国际水平。
다접수배전감우합등리자체질보의（MC-ICP-MS）인조작간단、Cr 용량소화성시등특점，이성위측정락동위소조성적일충발전추세。통과대수양중 Cr 적회수솔、간우리자적거제、진양방식적연구，건립료기우 MC-ICP-MS 적수배경중락동위소적측시방법。진이통과측정표준물질 SRM 979적락동위소조성，험증료해분석기술적가고성화준학성。결과표명，21조 SRM 979적53 Cr／52 Cr 가권평균치위0．11341±0．00002（53 Cr／52 Cr 추천치위0．11339±0．00015），정도위±0．17‰（2σ，95％치신도），체도국제수평。
It has been a trend that high-resolution multiple collector inductively coupled plasma mass spectrometry (MC-ICP-MS) is widely used in analyzing Cr stable isotope due to its simple operation,lower dosage and time saving.The MC-ICP-MS method was developed to determine the isotopic composition of Cr in water by investigating the recovery of Cr in samples,the removal of interference ions and the injection method of samples.Furthermore,the reliability and accuracy of this method were verified by measuring the chromium isotopic composition of standard material SRM 979.The weighted average of 21 SRM 979 samples was 0.113 41±0.000 02 (the certificated value was 0.113 39 ±0.000 15),and the uncertainty of the isotope measurements was ±0.17‰ (2 SD,95% confidence level),which reached international standards.