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Use of a direct mercury analyzer® for mercury speciation in different matrices without sample preparation

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Abstract

Use of thermal release to obtain mercury speciation information has long been used. In this work, operational conditions of a commercial thermal direct mercury analyzer (DMA-80 Milestone), which is normally used for total mercury determination, were investigated for performing mercury speciation. Mercury standards (Hg0, HgCl2, Hg2Cl2, HgSO4 and HgS) were prepared using solid dilution (concentrations up to 300 μg kg−1). These samples and eight reference materials were analyzed. Fixed operating conditions of analysis included the following stepwise heating levels: 50, 100, 150, 200, 250, 300, 400, 500, 600 and 700 °C. From the results, it was possible to observe differences in the mercury temperature release profile for the standard samples. The analysis of the reference materials showed appropriate agreement with certified mercury concentrations and with the sum of those obtained at each temperature level. The performance of this equipment for mercury speciation was compared with the use of another mercury thermal desorption equipment that employs continuous heating. The two main advantages of using the direct mercury analyzer were that it enabled quantitative analysis including detection of Hg0 in the μg kg−1 concentration range and analysis of very small sample quantities, allowing a greater variety of studies on redox transformations of the metal in environmental matrices.

Graphical abstract: Use of a direct mercury analyzer® for mercury speciation in different matrices without sample preparation

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Publication details

The article was received on 07 Nov 2016, accepted on 06 Mar 2017, published on 07 Mar 2017 and first published online on 07 Mar 2017


Article type: Paper
DOI: 10.1039/C6AY03041F
Citation: Anal. Methods, 2017, Advance Article
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    Use of a direct mercury analyzer® for mercury speciation in different matrices without sample preparation

    C. C. Windmöller, N. C. Silva, P. H. Morais Andrade, L. A. Mendes and C. Magalhães do Valle, Anal. Methods, 2017, Advance Article , DOI: 10.1039/C6AY03041F

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