Determination of Lead,chromium,cadmium,copper,nickel in mining waste rock by Inductively Coupled Plasma Optical Emission Spectrometry with Microwave Digestio
An analytical method was established to pretreat mining waste rock by microwave digestion method,and then to determine the contents of five elements in the samples:lead,chromium,cadmium,copper and nickel by inductively coupled plasma atomic emission spectrometry.The effects of acid types,dosage,power,temperature,time and other microwave digestion conditions on the digestion of the samples were discussed,and the optimal digestion conditions were determined as follows:6mL nitric acid,2mL hydrochloric acid,2mL hydrofluoric acid,1mL hydrogen peroxide,microwave power 1400W,digestion temperature 200℃,and heat preservation for 50min.After digestion,the acid was driven and reconstituted with nitric acid,and the effect of acidity was compared,and the acidity was determined to be 5%.This method was applied to the determination of lead,chromium,cadmium,copper and nickel in mining waste,the results showed that the calibration curve was linear,the correlation coefficient of each element was greater than 0.9999,the detection limit of the method was 0.0006mg/kg～0.0060mg/kg,the relative standard deviation was 0.49%～2.21%,and the recovery rate was 96.5%～102.8%.This method has low acid consumption,short digestion time and high accuracy,and is suitable for the quantitative determination of lead,chromium,cadmium,copper and nickel metal elements in mining waste rock.
Mining wasteMicrowave digestionInductively coupled plasma atomic emission spectrometryMetallic element
万方数据
