近红外光谱技术快速测定手洗餐具洗涤剂中总活性物

Rapid Determination of Total Active Substances in Hand Washing Dishwashing Detergent by Near Infrared Spectroscopy

文章研究了近红外光谱技术在手洗餐具洗涤剂中总活性物含量的检测应用。以国标化学法检测值为参照,采用近红外光谱技术采集了手洗餐具洗涤剂近红外光谱图,通过一阶导数对谱图进行优化,结合偏最小二乘法(PLS)建立了总活性物含量的定量校正模型,模型交叉检验均方根误差(RMSEVC)为0.101,残差预测偏差(RPD)为4.7,模型决定系数R2为0.9547,通过外部样品验证,预测值与标准分析方法参考值之间的绝对误差小于0.3%,结果表明近红外光谱法与标准分析方法无显著性差异且稳定可行,同时检测时间从4h缩短至3min,极大提高了检测效率,可实现大批量样品的快速分析。

The application of near infrared spectroscopy in the determination of total active substances in hand washing dishwashing detergents was studied. Taking the detection value of national standard chemical method as reference, the near infrared spectroscopy technology was used to collect the near infrared spectra of hand washing detergent. The spectra were optimized by the first derivative, and the quantitative correction model of total active substance content was established by combining partial least squares(PLS) method. The root mean square error(RMSEVC) of model cross test was 0.101. The residual prediction deviation(RPD) was 4.7, and the model determination coefficient R;was 0.9547. Through external sample verification, the absolute error between the predicted value and the reference value of the standard analysis method was less than 0.3%. The results showed that there was no significant difference between the NIR spectroscopy and the standard analysis method, and the detection time was reduced from 4 h to 3 min. Greatly improve the detection efficiency, can realize the rapid analysis of large quantities of samples.