Uncertainty evaluation of the determination of cadmium in solid waste by inductively coupled plasma mass spectrometry
An uncertainty evaluation method for the determination of cadmium in solid waste by inductively coupled plasma mass spectrometry was established.By establishing a mathematical model,the factors affecting the uncertainty such as sample weighing,sample constant volume,standard curve preparation,calibration curve fitting and measurement reproducibility were analyzed.The results showed that the extended uncertainty of measurement was 0.080 8 mg/kg(k=2,95%confidence probability)when the cadmium content in solid waste was 0.421 mg/kg.The results show that the calibration curve fitting was the main source affecting the uncertainty of cadmium content in solid waste measured by ICP-MS,followed by the preparation of standard curve,and the influence of sample weighing,sample constant volume,measurement reproducibility on the uncertainty of the method could be ignored basically.
inductively coupled plasma mass spectrometryuncertainty evaluationsolid wastecadmium
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