Abstract. A methodology has been proposed for highly selective and highly sensitive extraction photometric determination of mercury with dithione.
Mercury (II) from a highly acidic environment in the presence of iodide ions and dimethylformamide (DMF) has been found to be quickly and selectively extracted by chloroform and benzene. When chloroform or benzene solution of dithione and buffer solution with pH 2.5-14 is added to the extract and the aqueous-organic phases are shaken during 5-10 seconds, a painted complex compound is formed. The apparent molar repayment rate at a maximum light absorption of 610 nm is 7.1·104. The determination of mercury (II) is not prevented by 10,000 to 60,000 foreign ions within an error range of 2-5%.
The developed method has been applied to the analysis of industrial wastewater. The analysis time is 2-3 minutes, relative to the standard deviation of 0.02. The correctness and reproducibility of the method has been verified by the methods of additives in waste water. The method can be used to determine micro-containing mercury in air, biological materials, ores, rocks and other chemically complex materials without prior separation of accompanying elements.
The paper investigates conditions of selective extraction of a colorless halogenic complex of mercury (II) by inert organic solvents and its complexation with dithione directly in an organic phase, with the purpose of development of a highly selective, simple and accelerated method of extraction-photometric definition of mercury without preliminary separation of accompanying elements.
As a result of the research, a new highly selective, accelerated and simple extraction-photometric method for determining mercury directly in the organic phase has been developed.
Therefore, the developed method of extraction-photometric determination of mercury is recommended for the analysis of mercury in industrial wastewater, ores, rocks, concentrates, industrial waste and other chemically complex materials.
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