Determination of Mercury in Geological Materials by Continuous-Flow, Cold-Vapor, Atomic Absorption Spectrophotometry
作者:
K.R. Kennedy,
J.G. Crock,
期刊:
Analytical Letters
(Taylor Available online 1987)
卷期:
Volume 20,
issue 6
页码: 899-908
ISSN:0003-2719
年代: 1987
DOI:10.1080/00032718708062939
出版商: Taylor & Francis Group
关键词: Mercury analysis;Continuous-flow analysis;Cold-vapor analysis;Geological materials
数据来源: Taylor
摘要:
To determine mercury in geological materials, samples are digested with nitric acid and sodium dichromate in a closed teflon vessel. After bringing to a constant weight, the digest is mixed with air and a sodium chloride-hydroxylamine hydrochloride-sulfuric acid solution and then Hg(II) is reduced to Hg with stannous chloride in a continuous flow manifold. The mercury vapor is then separated and measured using cold vapor atomic absorption spectrophotometry (CV-AAS). For a 100 mg sample the limit of detection is 20 parts per billion (ppb) Hg in sample. To obtain a 1% absorption signal, the described method requires 0.21 ppb Hg solution (equal to 16 ppb in sample). Precision is acceptable at less than 1.2% RSD for a 10 ppb Hg aqueous standard. Accuracy is demonstrated by the results of the analysis of standard reference materials. Several elements do interfere but the effect is minimal because either the digestion procedure does not dissolve them (e.g., Au or Pt) or the; are normally of low abundance (e.g., Se or Te).
点击下载:
PDF (312KB)
返 回