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Development of an On-line Preconcentration System for Determination of Mercury in Environmental Samples

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Abstract

An on-line preconcentration system using solid-phase extraction with polytetrafluoroethylene was used for the determination of mercury by cold vapor atomic absorption spectrometry. The system uses electronically controlled valves and operates in two simple steps using sorption and elution. The Hg(II) ammonium pyrrolidinedithiocarbamate complexes are retained in a minicolumn packed with the sorbent. The elution, transportation, and reduction of the analyte ions are promoted by a solution of sodium tetrahydroborate(III). After optimization, the developed method showed the following analytical characteristics: a limit of detection of 0.02 μg L−1, linearity of 0.07 to 2.00 μg L−1, enrichment factor of 35, and sampling frequency of 27 h−1. The accuracy of the method was tested by analyzing the certified reference material BCR-060 Lagarosiphon major (aquatic plant). The proposed method was applied to the determination of mercury in water samples.

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Abbreviations

CV-AAS:

Cold vapor atomic absorption spectrometry

CV-AFS:

Cold vapor atomic fluorescence spectrometry

ICP-OES:

Inductively coupled plasma optical emission spectrometry

ICP-MS:

Inductively coupled plasma mass spectrometry

APDC:

Ammonium pyrrolidinedithiocarbamate

PTFE:

Polytetrafluoroethylene

GLS:

Gas-liquid separator

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Authors and Affiliations

  1. Laboratório de Química Analítica (LQA), Universidade Estadual do Sudoeste da Bahia, Campus de Jequié, Jequié, Bahia, 45206-190, Brazil

    Liz Oliveira dos Santos & Valfredo Azevedo Lemos

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  1. Liz Oliveira dos Santos
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  2. Valfredo Azevedo Lemos
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Correspondence to Valfredo Azevedo Lemos.

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dos Santos, L.O., Lemos, V.A. Development of an On-line Preconcentration System for Determination of Mercury in Environmental Samples. Water Air Soil Pollut 225, 2086 (2014). https://doi.org/10.1007/s11270-014-2086-7

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  • DOI: https://doi.org/10.1007/s11270-014-2086-7

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