Determination of Arsenic in Sodium Sulfide Solution by Atomic Fluorescence Spectrometry
As one of the important control indexes in the solution of nickel electrolytic system,arsenic content affects the grade rate of nickel plate.A large amount of sodium sulfide solution is usually added in the copper removal process of nickel system purification as a precipitator to remove copper in the solution.In order to avoid excessive arsenic introduced into the sodium sulfide solution,arsenic content in the sodium sulfide solution needs to be analyzed.In this paper,an analytical method for the determination of arsenic in sodium sulfide solution by atomic fluorescence method has been established by using iodine as an oxidant to oxidize the divalent sulfur ion in sodium sulfide solution.In this paper,the effects of iodide,iodide and sodium ions on the determination of arsenic were tested,and the dosage of iodine,hydrochloric acid,thiourea-ascorbic acid mixed solution was determined.The content of arsenic in the sample was determined by atomic fluorescence spectrometry with hydrochloric acid as carrier and potassium borohydride as reducing agent.When the linear range of the working curve is 0～50 μg/L,the correlation coefficient can reach above 0.999 5,the relative standard deviation is 6.55%～8.25%,and the recoveries are 85.0%～109.0%,meeting the requirements of analysis.
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