摘要
研究了半熔 -电感耦合等离子体质谱法 (ICP -MS)同时测定地质样品中痕量碘、溴、硒和砷等非金属元素的可行性。重点研究了不同介质中碘以及溴、砷、硒不同形态对测定信号的影响。比较并讨论了在纯水溶液、0 .0 7mol/LNH3·H2 O溶液以及 0 .32mol/LHNO3溶液中碘等元素不同形态阴离子的ICP -MS信号强度和记忆效应问题。相同浓度但不同形态的碘离子(I- 、IO-3 、IO-4 )在不同溶剂介质中其ICP -MS离子计数率不一致 ,I- 的信号比其他两种形态碘变化大 ,尤其是在HNO3介质中 ,信号很强 ,但波动大而且无规则性。在弱酸或稀NH3·H2 O介质中 ,碘信号比较稳定。选择稀NH3·H2 O清洗进样系统 ,显著降低了碘、溴的记忆效应。在弱酸或弱碱性介质中 ,碘、溴、硒和砷等非金属元素具有较高的信背比 ,可用ICP
The feasibility of simultaneous determination of trace iodine,bromine,selenium and arsenic in geological samples by inductively coupled plasma mass spectrometry was investigated. The signal response of different anion species in different solution mediums was assessed. It is shown that in nitric acid solution the ion signal intensity of I - is much higher than that of IO - 3 and IO - 4. In addition,the observed I - signal in nitric acid solution is not stable. The results from the experiments also show that weak acid solution or ammonia solution is a suitable medium for determination of these elements and addition of ammonia solution is a effective way in eliminating the memory effect from iodine and bromine.
出处
《岩矿测试》
CAS
CSCD
北大核心
2001年第3期161-166,共6页
Rock and Mineral Analysis
基金
国土资源部地质大调查项目 (DKD 990 40 13)
关键词
电感耦合等离子体质谱法
溴
碘
硒
砷
记忆效应
地质样品
阴离子形态
inductively coupled plasma mass spectrometry
geological sample
iodine
bromine
selenium
arsenic
memory effect
