岩矿测试2011，Vol.30Issue(3)：333-336,4.
石墨炉原子吸收光谱法测定地球化学样品中微量铬
Determination of Trace Chromium in Geochemical Samples by Graphite Furnace Atomic Absorption Spectrometry
摘要
Abstract
This article described the application of the ZEEnit 600 graphite furnace atomic absorption spectrophotometer on determination of trace chromium in geochemical samples. The HClO4 was added during digestion to oxidize both Cr( Ⅱ ) and Cr( Ⅲ) to Cr(Ⅳ) , which avoid the analysis error caused by the different absorbencies of Cr( Ⅱ ) and Cr(Ⅲ ). The atomization temperature of Cr was reduced to 2100 ℃ by the technique of longitudinal heating at maximum speed in graphite furnace. The addition of ascorbic acid as matrix modifier improved the sensitivity and precision of the measurement, meanwhile increased the service life of graphite furnace. The linear range is from 0 to 200 ng/mL and the correlation coefficient is 0.9980 with background correction by using inverse Zeeman effect. The detection limits of the method is 0.05 μg/g (dilution factor is 2500) , the precision of the method (RSD) is 2.11％ -5.96％. The method has been validated by the national standard materials. The measured results were consistent with the certified values, and the results were accurate and reliable.关键词
铬/地球化学样品/石墨炉原子吸收光谱法Key words
chromium/ geochemical samples/ graphite fumace atomic absorption spectrometry引用本文复制引用
邢夏,徐进力,何晓辉,孙晓玲,张芳..石墨炉原子吸收光谱法测定地球化学样品中微量铬[J].岩矿测试,2011,30(3):333-336,4.基金项目
国土资源地质大调查项目资助(1212010511218-6-3) （1212010511218-6-3）
