IC测定化妆品中硼酸和硼酸盐的不确定度评定

Evaluation of Measurement Uncertainty for Determination of Boric Acid and Borate in Cosmetics by Ion Chromatography

采用离子色谱法测定化妆品中硼酸和硼酸盐的总量,并根据《JJF1059.1-2012测量不确定度评定与表示》建立数学模型,对上述方法的不确定度进行分析评定。经计算,其测量不确定度主要来源于标准曲线拟合及测量重复性,而称样及稀释过程引入的不确定度则较小;因此,为降低不确定度,提高结果准确性,需定期对仪器进行确认,以保证仪器处于稳定良好的状态。

The total amount of boric acid and borate in cosmetics was determined by Ion Chromatography.A mathematical model was established according to JJF1059.1-2012 Evaluation and Expression of Uncertainty in Measurement,the uncertainty of the above methods was analyzed and evaluated.The uncertainty of measurement was mainly derived from the fitting and measurement repeatability of standard curve,while the uncertainty introduced in the weighing sample and dilution process was smaller.Therefore,in order to reduce the uncertainty and improve the accuracy of the results,the instrument should be confirmed regularly to ensure the instrument is in a stable and good state.