China Nonferrous Metallurgy

Based on microwave digestion pretreatment-ion chromatography (IC), an analytical method was established for the determination of chloride ion content in electroplating sludge, and the consumption of digestion solution, digestion time and digestion temperature were optimized by experimental conditions. The results show that the best addition standard recovery can be obtained by such method when the amount of digestion solution is 8mL, the digestion time is 4h and the digestion temperature is 60℃. Under the optimal pre-treatment conditions, the standard curve equation of chloride ion was y=0.1529x+0.0321 (R²=0.9998), the detection limit of the method was 0.005mg/L the relative standard deviation (RSD) was 0.77% and the addition standard recovery ranged from 96.17% to 104.09% within the scope of standard curve. In the actual electroplating sludge sample detection, it could be seen that the content of chloride ions in electroplating sludge ranged from 43321mg/kg to 62113mg/kg, and the RSD values of the detection results were less than 3%. This indicates that the linear relationship, sensitivity, precision and addition standard recovery of this method can meet the detection requirements and has certain value of popularization and application due to batch detection, simple and easy operation.