Determination of Seven Heavy Metal Element Residues in Disposable Cups by Microwave Digestion-inductively Coupled Plasma Mass Spectrometry
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Abstract:
A method for the determination of seven heavy metal element residues (lead, chromium, nickel, arsenic, antimony, cadmium, and barium) in disposable paper cups was established using microwave digestion and inductively coupled plasma mass spectrometry (ICP-MS). Samples were digested by microwave digestion with nitric acid and hydrogen peroxide as the digestion solutions, and then analyzed with the kinetic energy discrimination model (KED) and an online internal standard solution. The detection signal (counts per second, CPS) showed a good linear relationship with the content of seven heavy metal elements; the correlation coefficient R2 was>0.9997, the recovery was in the range of 85.0%~112.2%, and the relative standard deviation (RSD) was less than 6.46%. This method was used to analyze the seven heavy metal elements in the national standard material GBW10045, and the results were consistent with the standard values. The method developed in this study is sensitive, rapid, and accurate, and it is suitable for the analysis and detection of seven trace heavy metal elements in disposable paper cups.
