便携式近红外甲醇检测仪与实验室仪器预测能力比较

目的探究联合研发便携式近红外检测仪检测白酒基酒中甲醇含量的可行性。方法分别用比色皿、液体探头取样检测白酒基酒中甲醇的含量,借助化学计量学方法建立白酒中甲醇含量的预测模型,并与实验室VECTOR33型近红外光谱仪所建模型的预测能力进行比较。结果校正集决定系数分别为:0.819、0.838、0.886,校正标准差分别为:16.13、15.78、14.60mg/L,验证集的决定系数分别为:0.814、0.820、0.844,预测标准差分别为:19.99、19.25、20.44 mg/L,平均相对误差分别为:8.94%、8.32%、9.34%。结论研发的便携式近红外检测仪与实验室仪器的检测结果具有较好的一致性,可以用来检测白酒基酒中甲醇含量。

Comparison of prediction ability between portable near infrared methanol detector and laboratory instrument

Objective To explore the feasibility of developing a portable near infrared detector to detect methanol content in liquor base liquor. Methods The methanol content in liquor base liquor was detected by the sampling of colorimetric dish and liquid probe, and the prediction model of methanol content in liquor was established by stoichiometry, and compared with the prediction ability of the model established by VECTOR33 nir spectrometer in the laboratory. Results The determination coefficients of the calibration set were: 0.819, 0.838, 0.886, the calibration standard deviation was: 16.13, 15.78, 14.60 mg/L, the determination coefficients of the validation set were: 0.814, 0.820, 0.844, the prediction standard deviation was: 19.99, 19.25, 20.44 mg/L, and the average relative errors were: 8.94%, 8.32%, 9.34%, respectively. Conclusion The portable near infrared detector developed has good consistency with the test results of laboratory instruments, which can be used to detect the methanol content in liquor base liquor.