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An assay for inorganic mercury(II) based on its post‐catalytic enhancement effect on the potassium permanganate–luminol system
Author(s) -
Hu Shangwei,
Liu Weibing,
Huang Yuming,
Shu Weiqun,
Cao Jia
Publication year - 2006
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.914
Subject(s) - potassium permanganate , luminol , chemistry , chemiluminescence , detection limit , mercury (programming language) , permanganate , potassium , catalysis , atomic absorption spectroscopy , hydride , relative standard deviation , analytical chemistry (journal) , chromatography , inorganic chemistry , hydrogen , organic chemistry , physics , quantum mechanics , computer science , programming language
Abstract A strong chemiluminescence (CL) response is observed when potassium permanganate solution is injected into basic luminol solution. When the CL reaction terminates, subsequent injection of Hg 2+ solution into the reaction mixture results in a new CL reaction. Based on the post‐catalytic enhancement effect of Hg 2+ on the potassium permanganate–luminol system in basic media, a fast and simple CL‐coupled flow injection analysis for the determination of Hg 2+ was developed. In optimum conditions, CL intensity is proportional to Hg 2+ concentration over the range 1.0 × 10 −8 –1.0 × 10 −5 g/mL, with a detection limit of 2.0 × 10 −9 g/mL. The relative standard deviation (RSD) is 3.6% for 1.0 × 10 −7 g/mL Hg 2+ ( n = 11). After pretreatment with sulphydryl cotton fibre, environmental water samples were analysed by the proposed method for total mercury determination with satisfactory results. The results were in good agreement with those given by hydride generation–cold vapour atomic absorption spectrometry (HG–CVAAS). Copyright © 2006 John Wiley & Sons, Ltd.