Determination of Heavy Metals in Electroplating Sludge by Microwave Digestion-ICP-MS
Received:April 06, 2021  Revised:April 15, 2021
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KeyWord:electrophoresis sludge; microwave digestion; ICP-MS; heavy metals; ecological environment risk assessment
muxuejun 黑龙江省佳木斯生态环境监测中心
WANG Dongchun 黑龙江省佳木斯生态环境监测中心
liyongliang 黑龙江省佳木斯生态环境监测中心
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      A microwave digestion system was used to digest a certain electroplating sludge, and the heavy metals in the sludge were determined by ICP-MS. Weigh the prepared sample, place it in the digestion tank and fully react, drive away the acid, and determine the volume by inductively coupled plasma mass spectrometry.The chromium in the electroplating sludge is 18845.2mg/kg, cadmium is 10.3mg/kg, nickel is 5200.0mg/kg, lead is 189.7mg/kg, copper is 3271.7mg/kg, and zinc is 49632.6mg/kg. The measurement results show that the working curve of the tested items has a good linear relationship, and the correlation coefficient r is greater than 0.999. The standard recovery rate of chromium is between 91.6-97.7%, the standard recovery rate of cadmium is between 92.0-97.0%, the standard recovery rate of nickel is between 95.1-98.0%, and the standard recovery rate of lead is between 94.3-95.2%. The recovery rate of copper standard addition is between 97.1% and 102%, and the recovery rate of zinc standard addition is between 96.3% and 98.7%, which all meet the relevant measurement requirements. The calculated potential ecological hazard coefficient and potential ecological hazard index results show that the chromium, cadmium, lead, copper, and zinc in the electroplating sludge are minor ecological hazards, and nickel is a strong ecological hazard; the calculated potential ecological hazard index RI is 216.69, belonging to Moderate ecological hazard.