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本文采用氯离子选择电极法对海砂氯离子进行测定,并分别对7点拟合曲线和6点拟合曲线进行误差分析,结果表明:采用氯离子选择电极法测试标准溶液氯离子浓度,标准点基本落在拟合曲线上,测试精度较高;当溶液氯离子浓度低于0.0005mol/L,选择电极法测试精度会降低,此时6点拟合曲线相对于7点拟合曲线测试精度更高;6点拟合曲线测得氯离子含量与国标滴定法测试相符性较好。
In this paper, chloride ion selective electrode method was used to determine the chloride ion in sea sand. Error analysis was performed on the 7-point fitting curve and the 6-point fitting curve respectively. The results showed that the chloride ion selective electrode method was used to test the standard solution of chloride ion concentration, When the concentration of chloride ion in the solution is less than 0.0005mol / L, the accuracy of the selected electrode method will decrease, and the accuracy of the 6-point fitting curve versus the 7-point fitting curve test accuracy Higher; 6-point fitting curve measured chloride ion content and national standard titration test is better.