| The silver sample was dissolved in nitric acid, and then separated the dissolved silver matrix by either hydrochloric acid or potassium thiocyanate precipitation methods. The concentrations of copper, zinc, chromium, lead and cadmium in sterling silver were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The results showed that lead and cadmium were adsorbed by AgCl for the HCl precipitation method, and that its recovery and relative standard deviation (RSD) did not meet the determination requirements. However, the AgSCN precipitation method meets the requirements of determination in that there was no adsorption of lead and cadmium by silver thiocyanate. |
