Determination of 6 Hazard Elements in Spatholobi Caulis by ICP-MS and Its Limit Assessment

OBJECTIVE To develop a method for the determination of 6 hazard elements such as Cr， Cu， As， Cd， Hg and Pb in Spatholobi Caulis. METHODS After the microwave digestion and then 6 hazard elements were determined by ICP-MS at the same time. Based on this， the limit of Cr， Cu， As， Cd， Hg and Pb were assessed with WHO standards. RESULTS The determination results of 6 hazard elements all have a good linear relationship， r≥0.9998. The limit of detection was range from 0.0016~0.0227ng/mL， the average recovery was 70.05%~117.98%， and RSD were 1.30%~3.69%. Determination results of samples of 6 hazard elements less than the maximum limit value（0.8000， 140.0， 0.8571， 0.4000， 0.2286， 1.429mg/kg）. CONCLUSION The method is simple， accurate and high sensitive， can be used for the quality control and limit assessment of Spatholobi Caulis.