METHODS AND OBJECTS OF CHEMICAL ANALYSIS ISSN title: "Metody i obʺekty himičeskogo analiza" An international journal devoted to all aspects of Analytical chemistry ISSN 2413-6166 (Online), ISSN 1991-0290 (Print)
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Cold vapor atomic absorption determination of Mercury in environmental samples after cloud point extraction

V.O. Doroschuk, M.S. Myglovets, A.M. Horbachevskyy

The possibility to use capric acid and octylamine for mercury (II) preconcentration by the cloud point extraction and later cold vapor atomic absorption spectrometry (AAS) determination was investigated. Under the optimum conditions, preconcentration of 50 ml of sample in the presence of 0.5% non-ionic surfactant Triton X-114, 0.01 mol L-1 capric acid and octylamine permitted the detection of 3 ng L-1 mercury. The experimental enrichment factor was 25 (for 50 mL of sample solution, 50 mL/2mL). The relative standard deviation for 10 replicates containing 50 ng L-1of mercury was 5.8%. The proposed method was successfully applied to determination of mercury in some river of Ukraine and in sediments of south-west seacoast of Crimea.