电感耦合等离子体原子发射光谱法测定牙科修复体产品中的铍、镉

Determination of beryllium and cadmium in dental restorations by inductively coupled plasma atomic emission spectrometry

建立电感耦合等离子体原子发射光谱法测定牙科镍铬合金、钴铬合金烤瓷修复体产品金属部分中铍、镉含量的分析方法.以6 mL浓硝酸、2 mL浓盐酸和0.5 mL氢氟酸为消解液,采用微波消解法消解样品.铍、镉的质量浓度在5~50 mg/L范围内与光谱强度呈良好的线性关系,线性相关系数均为1.000,铍,镉的检出限分别为0.8,1.8μg/L.加标回收率为96.2%~104.6%,测定结果的相对标准偏差为2.1%~4.4%(n=10).该方法具有良好的精密度与准确度,可用于牙科镍铬合金、钴铬合金烤瓷修复体产品金属部分中铍、镉的测定.

A method for determination of beryllium and cadmium content in the metal parts of dental nickelchromium alloy and cobalt-chromium alloy ceramic restorations by inductively coupled plasma atomic emission spectrometry(ICP–AES) was established. 6 mL concentrated nitric acid,2 mL concentrated hydrochloric acid and 0.5 mL hydrofluoric acid was used as digestion solution,and the sample was digested by microwave digestion. The mass concentration of beryllium, cadmium had good linear relationship with the spectral intensity in the range of 5–50 mg/L, the linear correlation coefficients were all 1.000,and the detection limits of beryllium and cadmium were 0.8, 1.8 μg/ L, respectively. The recoveries ranged from 96.2% to 104.6%,the relative standard deviations of the measured results were 2.1%–4.4%(n=10). The method has good precision and accuracy,which can be used for the determination of beryllium and cadmium in the metal parts of ceramic restorations made with nickel–chromium alloy and cobalt–chromium alloy.