Abstract：The sample was leached by ultrasonic extraction using water as solvent. Proper amount of 0.25mol/L trisodium citrate-1mol/L potassium nitrate solution was added as the total ion strength adjustment buffer. The time was controlled at 5min. The determination method of water-soluble chloride in silver concentrate by ultrasonic extraction-ion selective electrode was established. The ultrasonic extraction conditions were optimized as follows: 0.5g of sample was treated by ultrasonic extraction for 15min in 20mL of water at bath temperature of 50℃. The determination conditions were also investigated. The results showed that the determination of S value (electrode response slope) and sample should be conducted in same constant temperature system in order to reduce the potential fluctuation and guarantee the accuracy of measurement results. Under optimized experimental conditions, the natural logarithm of mass concentration of chloride ion in range of 2-12μg/mL was in good linearity with the potential value. The correlation coefficient was 0.9998 and the detection limit was 0.863μg/mL. Two silver concentrate samples were determined in parallel according to the experimental method. The found results were basically consistent with those obtained by the ion chromatography. The relative standard deviations (RSD, n=6) were between 2.1% and 2.8%.
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