硫酸肼还原法测定水中硝酸盐氮评价

Determination of nitrate nitrogen in water by hydrazine sulfate reduction method

通过采用硫酸肼还原法来测定水中的硝酸盐氮含量,并对实验过程中可能产生影响的干扰离子(氯离子、亚硝酸根离子、硫酸根离子以及铵根离子)进行研究测定,分析其对实验结果是否产生影响;针对氯离子对测量结果的干扰实验,同时采用了紫外分光光度法与硫酸肼还原法进行比较。结果表明,硫酸肼还原法作出的标准曲线线性范围基本稳定在0.9960~0.9994之间,氯离子以及亚硝酸根离子均会对测定结果产生影响,其中,氯离子会使最终测定结果偏低,亚硝酸根离子会使最终测定结果偏高。将硫酸肼还原法与紫外分光光度法准确度进行比较,得出的结论是硫酸肼还原法准确度较高。

By using hydrazine sulfate reduction method to determine the content of nitrate in water,and to study the possible interference ions (chloride ion,nitrite ion,sulfate ion and ammonium ion) during the experiment,and to analyze the effect on the experimental results.In view of the interference experiment of chloride ion on the measurement results,the ultraviolet spectrophotometry and hydrazine sulfate reduction method were used to compare.The results show that:the linear range of the standard curve is basically stable between 0.996 0 and 0.999 4,and the experimental results of interfering ions show that the chlorine ions and nitrite ions will influence the results.Among them,chloride ion will make the determination result low,nitrite ion will make the determination result high.At last,the accuracy of hydrazine sulfate reduction method was compared with that of ultraviolet spectrophotometry.