Highly sensitive potentiometric sensor for detection of mercury in Cl--rich samples

SENSORS AND ACTUATORS B-CHEMICAL

卷:208

Article

Liang, Rongning^1,2  Wang, Qianwen³  Qin, Wei^1,2 

[1] Chinese Acad Sci, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai Inst Coastal Zone Res YIC, Yantai 264003, Shandong, Peoples R China

[2] YICCAS, Shandong Prov Key Lab Coastal Environm Proc, Yantai 264003, Shandong, Peoples R China

[3] Qingdao Agr Univ, Cent Lab, Qingdao 266109, Shandong, Peoples R China

关键词: Potentiometry;    Ion-selective electrodes;    Asymmetric membranes;    Anionic mercury species;    Cl--rich samples;   

DOI  :  10.1016/j.snb.2014.11.040

来源: Elsevier

【 摘 要 】

Potentiometric sensors have been exploited for the determination of Hg2+ ions. However, applications of such sensors are limited to mercury detection in the absence of a Cl--rich background since Hg2+ can readily form coordination complexes with Cl-. This paper describes a potentiometric sensor for the determination of anionic mercury species using tert-butylcalix[4] arene-tetrakis(N, N-dimethylthioacetamide) as anion-selective ionophore and tridodecylmethylammonium chloride as ion exchanger. An asymmetric membrane rotating ion-selective electrode configuration is used to improve the detection sensitivity. By using HgCl3-as a model of anionic mercury species, the proposed method allows potentiometric detection of mercury down to nanomolar levels in samples containing 0.05 M NaCl background electrolyte. The practical application of the proposed sensor has been performed for the determination of total mercury concentrations in diluted seawater samples. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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