摘要
目的：研究持久化学改进剂W—Ir电热原子吸收光谱法（ETAAS）直接测定尿中痕量镉。方法：选用250μgW＋200μgIr作为持久改进剂处理石墨平台并进行试验，考察了尿样在不同稀释倍数下的灰化温度、原子化温度及各项分析性能指标，并与常规改进剂NH4H2PO4＋Mg（NO3）：比较。结果：采用W—Ir作持久改进剂，电热原子吸收光谱法直接测定尿中镉，灵敏度高于常规改进剂，背景信号值低，且较低的原子化温度，有利于延长石墨管使用寿命。尿镉测定的相对标准偏差RSD值（n=5）为0．3％～2．7％，样品加标回收率为92％-108％，检出限及特征质量分别为0．025μg/L和1.5 pg。结论：所建立的分析方法准确、灵敏、简便。
Objective ：To study W -Ir as permanent chemical modifier in the direct determination of cadmium in urine by electrothermal atomic absorption spectrometry（ETAAS）. Methods：250μg W ＋ ：200 μg Ir coating on the integrated platform of a transversely heated graphite atomizer （THGA）was used in the tests. Pyrolysis temperature curves and atomic temperature curves of urine with different dilution times were observed. The analytical performances were estimated and comparisons with the conventional modifier NH4 H2 PO4 ＋ Mg （ NO3 ） 2 were performed. Results： The background signal was low and the sensitivity was high. The lower atomic temperature was in favor of prolonging the lifetime of graphite platform when compared with NH4H2PO4 ＋ Mg（ NO3 ）2 conventional modifiers. Under the optimized conditions, the RSD（ n = 5 ） was 0. 3% - 2.7%, the recoveries 92. 0% - 108.0%, the detect limit for urine 0. 025μg/L and the characteristic mass （mo） 1.5 pg. Conclusion：This method is accurate, simple and sensitive.
出处
《中国卫生检验杂志》
CAS
2009年第2期245-247,250,共4页
Chinese Journal of Health Laboratory Technology
基金
四川省卫生厅科学研究项目(05147)资助
关键词
持久化学改进剂W—Ir
电热原子吸收光谱法
镉
尿
直接测定
Permanent chemical modifier W - Ir
Electrothermal atomic absorption spectrometry
Cadmium
Direct determi-nation
Urine
