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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.