ICP-MS法与二安替比林甲烷比色法测定凉果中二氧化钛的比较

Comparison of Measuring of Titanium Dioxide in Preserves by ICP-MS and Diantipyrylmethane Colorimetric Method

采用ICP-MS法和二安替比林甲烷比色法测定凉果的二氧化钛,并分析两种方法的适用性。样品经微波消解,用ICP-MS检测钛含量;样品经湿法消解,用紫外可见分光光度计检测钛含量,计算得到二氧化钛含量。结果表明,ICP-MS法的检出限为0.0186 mg·kg^(-1),回收率在92.5%~105.8%,RSD在2.35%~2.41%;二安替比林甲烷比色法的检出限为0.36 mg·kg^(-1),回收率在101.4%~102.3%,精密度在1.03%~1.14%。二安替比林甲烷比色法适合普通实验室的日常检验;ICP-MS法检出限更低,更适用于低含量样品检测。

ICP-MS method and diantipyrine methane colorimetric method were used to determine titanium dioxide in cold fruit,and the applicability of the two methods was analyzed.The samples are digested by microwave and the content of titanium is determined by ICP-MS;the samples are digested by wet method,and the content of titanium is determined by ultraviolet visible spectrophotometer,and the content of titanium dioxide is calculated.The results show that the detection limit of ICP-MS method is 0.0186 mg·kg^(-1),the recovery is 92.5%~105.8%,the RSD is 2.35%~2.41%;the detection limit of diantipyrylmethane colorimetric method is 0.36 mg·kg^(-1),the recovery is 101.4%~102.3%,the RSD is 1.03%~1.14%.The diantipyrylmethane colorimetric method is suitable for daily testing in grassroots laboratories;ICPMS method has a lower detection limit and is more suitable for detecting low content samples.