Abstract：In existing method, the content of chlorine in copper concentrate was determined by potentiometric titration after alkali fusion. Based on this, a new determination method of chlorine in sample by potentiometric titration was proposed. The sample was directly dissolved with water on electromagnetic stirrer by heating. After filtration, the content of chlorine was determined. 1.000 g of sample was dissolved in about 40 mL of water on constant temperature electromagnetic stirrer at 110 ℃ for 90 min. Then, it was filtered with rapid qualitative filter paper. The filtrate was rinsed until there was no chlorine ion which was examined with silver nitrate solution. The volume of filtrate was controlled at 50 mL. Then, 22 mL of ethanol and 4 drops of nitric acid (1+50) were added. Finally, the content of chlorine was determined by potentiometric titration using silver nitrate standard solution as titrant. The interference test showed that the coexisting elements in copper concentrate sample did not interfere with the determination of chlorine. The precision and recovery tests of actual copper concentrate sample were conducted according to the experimental method. The results indicated that the relative standard deviations (RSD, n=5) were between 1.5% and 8.6%, and the recoveries were between 94% and 99%. The proposed method was applied to the determination of copper concentrate certified reference material. The error between found results of four parallel determinations and certified values was within the range of allowable error. Three copper concentrate samples were determined by proposed method and ion chromatography for comparison. The results showed that the determination values of two methods were basically consistent.
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