端视ICP-AES法直接测定食品添加剂DL-酒石酸中有害元素

通过同时提高RF 发射功率及雾化气流量，使端视电感耦合等离子体原子发射光谱(ICP-AES)法可以直接用于测定食品添加剂DL- 酒石酸中有害元素铅和砷。确定了ICP-AES 测定条件。铅和砷的检出限分别为0.003mg/L和0.005mg/L，定量限分别为0.25mg/kg 和0.41mg/kg，回收率为96.2%～105.6%，相对标准偏差为1.82%～2.42%。本法完全满足食品添加剂DL- 酒石酸中有害元素的测定要求。

Direct Determination of Harmful Elements in Food Additive DL-Tartaric Acid by Axial View Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES)

A new method was developed for the direct determination of harmful elements, such as Pb and As, in food additive DL-tartaric acid with axial view ICP-AES through simultaneous elevation of RF emission power and atomization gas flux. The working parameters of ICP-AES were optimized in this study. The results showed that the limits of detection (LODs) of Pb and As by this method were 0.003 mg/L and 0.005 mg/L, respectively, and the limits of quantification (LOQs) were 0.25 mg/kg and 0.41 mg/kg, respectively. The recoveries of Pb and As at two spiked amounts of 0.50 mg/kg and 1.00 mg/kg were 96.2% to 105.6%, and the relative standard deviations were 1.82% to 2.42%. In conclusion, this method can meet the demand of determining harmful elements in food additive DL-tartaric acid.