Atomic fluorescence determination of mercury in fresh water ecosystems.

R Knox, W R Kammin, D Thomson
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引用次数: 5

Abstract

This paper reports on an investigation into determining nanogram/l quantities of mercury in marine and fresh water matrices using a cold vapour generation of mercury, followed by fluorescence detection. Samples were prepared for analysis using a free bromine oxidation technique. A high efficiency gas-liquid separator was used to enhance the detection of mercury. For fresh water, typical method detection limits (MDL) were determined at less than 1 nanogram/l (ng/l). For near shore seawater, the MDL was 1.2 ng/l. Method spikes, which were performed at 20 ng/l, showed mean recoveries within US EPA Contract Laboratory Protocol (CLP) acceptance criteria. System blanks averaged 0.12 ng/l, and recoveries of NIST 1641c diluted to 29.4 ng/l averaged 93.4%. A number of local rivers and streams were sampled, and mercury was determined. All results to date indicate mercury levels below the US EPA chronic water quality criteria for mercury.

淡水生态系统中汞的原子荧光测定。
本文报道了一项利用冷蒸汽产生汞,然后进行荧光检测来测定海洋和淡水基质中纳克/升汞量的研究。用游离溴氧化技术制备样品进行分析。采用高效气液分离机提高了汞的检测效率。对于淡水,典型方法检出限(MDL)小于1纳克/升(ng/l)。近岸海水的MDL为1.2 ng/l。在20 ng/l浓度下进行的方法峰值显示,平均回收率符合美国EPA合同实验室协议(CLP)接受标准。系统空白平均为0.12 ng/l, NIST 1641c稀释至29.4 ng/l的回收率平均为93.4%。对当地的一些河流和小溪进行了采样,并测定了汞含量。迄今为止的所有结果都表明,汞含量低于美国环保署的汞长期水质标准。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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