同位素稀释质谱法在丙烯腈-丁二烯-苯乙烯聚合物标准物质汞定值中的应用

Certification of Mercury in Acrylonitrile Butadiene Styrene by Using Isotope Dilution Mass Spectrometry

为应对欧盟的RoHS指令,中日韩三国建立了标准物质联合定值工作机制。文章系统介绍第一次联合定值合作中应用同位素稀释质谱法(IDMS)为日本丙烯腈-丁二烯-苯乙烯聚合物(ABS)塑料标准物质中汞定值的方法。首先利用MC-ICP-MS准确测量了202Hg稀释剂、国家标准物质和ABS塑料中汞的全丰度,然后采用国家标准物质标定202Hg稀释剂的浓度,最后利用IDMS测定ABS塑料中汞的浓度。为消除汞的记忆效应,采用5μg/g的Au(2%硝酸溶液)清洗1 min,而后用5μg/g的EDTA清洗2 min的程序。实验结果验证了实验室的测量能力,首次联合定值为下阶段工作奠定了技术基础。

Under the framework of a co-certification system tor the development of Certiffed Reference Materials （CRMs） among China, Japan and Korea, the 1st co-certification campaign of mercury in acrylonitrile butadiene styrene （ABS） for Japanese CRMs was taken. In this campaign isotope dilution mass spectrometry （IDMS） was used. First, all abundances of Hg in spike 202 Hg, CRM and ABS were analyzed by MC-ICPMS before the certification. Then the concentrations of 202 Hg and Hg in ABS were determined with IDMS by Q-ICP-MS. A new procedure to reduce memory effect was used. first, dilute with 5 μg/g Au solution for 1 mini then, 5μg/g EDTA solution for 2 min. The results accord to each other very well and this implies that the coertification system can run swimmingly.