Abstract：Accurate determination of arsenic in copper flash smelting dust is of great significance for the calculation of matter burdening and production control. The sample was dissolved with nitric acid-potassium chlorate saturated solution, ammonium fluoride solution and perchloric acid. After removing nitric acid with sulfuric acid (1+1), the arsenic ions in the solution were reduced to elemental arsenic with sodium hypophosphite in hydrochloric acid medium using copper sulfate as the catalyst. Other impurities were separated by filtration. The elemental arsenic was dissolved with excessive potassium dichromate standard titration solution. The excessive potassium dichromate standard titration solution was titrated with ferrous ammonium sulfate standard titration solution using N-phenylanthranilic acid as the indicator. The method for determination of arsenic in copper flash smelting dust by ferrous ammonium sulfate back titration was established. During the reduction of arsenic ions into elemental arsenic with sodium hypophosphite, some arsenic ions were possibly not reduced and then filtrated into the solution. The influence of residual arsenic in filtrate on the determination results was investigated. The results showed that the influence of arsenic in sample could be ignored because the mass fraction of arsenic in filtrate was less than 0.01%. The interference tests of coexisting elements showed that the influence of coexisting copper, lead, iron and zinc in sample on determination of arsenic could be ignored. The proposed method was applied for the determination of arsenic in three copper flash smelting dust samples. Meanwhile, the recovery tests of standard addition were conducted. The relative standard deviation (RSD, n=11) of determination results were between 0.35% and 2.6%. The recoveries were between 99% and 101%. The contents of arsenic in two copper flash smelting dust samples were determined according to the experimental method. The found results were consistent with those obtained by microwave digestion-inductively coupled plasma atomic emission spectrometry.
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