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本试验通过测定不同NaCl浓度的蔗糖液的旋光度,对Cl-的影响进行了回归分析研究。得回归方程αi=-0.007968Ci+0.01948相关系数r=-0.9746,表明有极显著的负相关。对于精度为士0.05°D的圆盘旋光仪,当NaCl浓度<8.72%时可忽略Cl-的影响;对于精度为士0.01°S的验糖仪,当NaCl浓度<2.88%时可忽略Cl-的影响。本试验结果表明二次旋光法测蔗糖含量时,HCl水解时发生的Cl-影响可忽略不计,因此可省去水解前旋光度测定加NaCl这一操作。
In this study, the effects of Cl- on the optical rotation of sucrose solution with different NaCl concentrations were studied by regression analysis. The regression equation αi = -0.007968Ci + 0.01948 correlation coefficient r = -0.9746, indicating a very significant negative correlation. For a disc polarimeter with an accuracy of ± 0.05 ° D, the effect of Cl- can be neglected when the NaCl concentration is <8.72%. For a candier with a precision of 0.01 ° S, when the NaCl concentration is <2 .88% can be ignored when the impact of Cl-. The results of this experiment show that the Cl-effect of HCl hydrolysis is negligible when the sucrose content of the second-order polarimetry is measured, thereby eliminating the need for the pre-hydrolysis polarimetric assay plus NaCl.