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丁香醛连氮测定饮水中余氯，具有试剂稳定，便于贮存，对人体无毒害作用，方法简便，试剂消耗量低等特点。对游离氯的特异性强，干扰少，还能分步测定总余氯及结合氯。方法选定最佳的试样试剂加入步骤及试样与试剂的体积比，灵敏度提高，最低检出浓度可达０．０３ｍｇ／Ｌ，克分子消光系数为２．６６×１０￣４。线性规律好，可进行分光光度测定，其标准工作曲线的相关系数达０．９９９以上。重现性好，０．５ｍｇ／Ｌ游离氯测定的变异系数仅为５．８５％。
Syringaldehyde nitrogen determination of residual chlorine in drinking water, with reagent stability, ease of storage, no toxic effects on the human body, the method is simple, low reagent consumption characteristics. The specificity of free chlorine strong, less interference, but also step-by-step determination of total residual chlorine and chlorine. The method selected the best sample reagent adding step and the volume ratio of the sample to the reagent, the sensitivity is improved, the minimum detectable concentration is up to 0.03mg / L and the molecular extinction coefficient is 2.66 × 10 ~ 4. Linear law is good, can be spectrophotometric determination of the standard working curve correlation coefficient of 0.999 or more. The reproducibility was good. The coefficient of variation of 0.5mg / L free chlorine was only 5.85%.