饮用水中硫酸盐测定方法的比较——培养卫生检验的质量控制能力

Sulphate Determination in Drinking Water Based on Detection Method Evaluation for Cultivating the Quality Control Ability in Hygienic Detection Education

饮用水中硫酸盐测定是卫生检验与检疫专业本科理化检验的实验课程。教学中发现实验内容多涉及标准文件方法验证和熟悉仪器操作,但实验室质量控制实训少,这使得学生实验误差大,实验室质量控制能力差。针对上述问题,以饮用水中硫酸盐测定实验为研究对象,采用分析方法对比的实验室质量控制方法,从标准曲线、检出限、精密度、加标回收率等参数,对硫酸盐测定的离子色谱法和硫酸钡比浊法进行对比评价。结果表明,离子色谱法对饮用水中硫酸盐检测的线性范围、检出限、精密度、加标回收率均显著优于硫酸钡比浊法,效果理想,可作为提升学生实验室质量控制能力的实训课程开设在理化综合开放性实验中。

The sulphate determination in drinking water is a major experimental curriculum in physical and chemical hygienic detection.However,the experimental curriculum mainly focused on the standard method validation and instrument operation.The training for quality control of laboratory was neglected.This deficiency led to large error and worse quality control in students’experimental data.To cover this shortage,this work used the analysis method comparison to improve the experiment.The ion chromatography and turbidimetry were compared and evaluated from calibration curve,detection limit,precision and recovery.The results showed that ion chromatography significantly excelled the turbidimetry in the parameters of linearity range,detection limit,precision and recovery.It was the ideal results to serve as the quality control training in student experiment.