期刊
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
卷 60, 期 5, 页码 705-710出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2005.03.006
关键词
Hg speciation analysis; vapor generation atomic absorption spectrometry; flow injection; fish tissue
类别
A simple and inexpensive laboratory-built flow injection vapor generation system coupled to atomic absorption spectrometry (FI-VG AAS) for inorganic and total mercury determination has been developed. It is based on the vapor generation of total mercury and a selective detection of Hg2+ or total mercury by varying the temperature of the measurement cell. Only the inorganic mercury is measured when the quartz cell is at room temperature, and when the cell is heated to 650 degrees C or higher the total Hg concentration is measured. The organic Hg concentration in the sample is calculated from the difference between the total Hg and Hg2+ concentrations. Parameters such as the type of acid (HCl or HNO3) and its concentration, reductant (NaBH4) concentration, carrier solution (HCl) flow rate, carrier gas flow rate, sample volume and quartz cell temperature, which influence FING AAS system performance, were systematically investigated. The optimized conditions for Hg2+ and total Hg determinations were: 1.0 mol 1(-1) HCl as carrier solution, carrier flow rate of 3.5 ml min(-1), 0.1% (m/v) NaBH4, reductant flow rate of 1.0 ml min(-1) and carrier gas flow rate of 200 ml min(-1). The relative standard deviation (RSD) is lower than 5.0% for a 1.0 mu g 1(-1) Hg solution and the limit of quantification (LOQ, 10 s) is 55 ng g(-1). Certified samples of dogfish muscle (DORM-1 and DORM-2) and non-certified fish samples were analyzed, using a 6.0 mol 1(-1) HCl solution for analyte extraction. The Hg2+ and CH3Hg+ concentrations found were in agreement with certified ones. (c) 2005 Elsevier B.V All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据