正热电离质谱同时测定硝酸盐中氮和氧同位素组成  

A Preliminary Investigation on Isotopic Determination of N and O in Nitrate by Positive Thermal Ionization Mass Spectrometry

作　　者：尹德忠[1] 肖应凯[1] 逯海[1] 

机构地区：[1]中国科学院青海盐湖研究所,青海西宁810008

出　　处：《盐湖研究》2001年第3期17-22,共6页Journal of Salt Lake Research

基　　金：国家自然科学基金 ( 2 9775 0 2 8)

摘　　要：初步研究了一种硝酸盐中氮和氧同位素质谱测定的新方法。该法利用石墨的非还原热离子发射特性 ,建立了以测定 Cs2 NO2 + 离子的正热电离质谱测定硝酸盐中氮和氧同位素组成的过程 ,对方法的可行性、特点和存在的问题进行了讨论 ,并对几种测定氮和氧同位素的方法进行了比较。运用正热电离质谱法对几种不同厂家生产的硝酸盐试剂的氮和氧同位素组成进行了测定 。The positive ionization mass spectrometry Procedure based on Cs 2NO 2 + ion for isotopic measurements of N and O in nitrate is first reported here.The addition of graphite onto the filament loading significantly enhances Cs 2NO 2 + ion emission from CsNO 3.The reliability and peculiarity of this procedure,as well as factors affecting the measurement precision were investigated preliminarily.The isotopic compositions of N and O in several nitrate reagents from different sources are determined and a significant diversity in isotopic compositions of N and O is observed.

关 键 词：氮 氧 硝酸盐 正热电离质谱 同位素 组成 测定 

分 类 号：O613.61[理学—无机化学] O615.2[理学—化学]