靛蓝二磺酸钠分光光度法测定水中总氮  

Determination of Total Nitrogen in Water by Indigo Disulphonate Spectrophotometry

作　　者：郭妍 贺心然[2,3] 肖晶 袁彩红 马玉琴 

机构地区：[1]连云港金兆水务有限公司,江苏连云港222001 [2]河海大学环境学院,江苏南京210098 [3]连云港市环境监测中心站,江苏连云港222001 [4]北京汉柯林环境科技有限公司,北京100125

出　　处：《淮海工学院学报（自然科学版）》2013年第2期64-67,共4页Journal of Huaihai Institute of Technology:Natural Sciences Edition

基　　金：连云港市科技发展计划项目(SH1113)

摘　　要：采用靛蓝二磺酸钠分光光度法测定水中总氮含量。样品经高压消解后加入显色剂靛蓝二磺酸钠显色,在最大吸收波长610nm处测定其吸光度。在质量浓度0～80mg/L线性范围内,线性回归方程为y=-0.004 4x+0.382 7,相关系数R=-0.999 2。实际水样的加标回收率为96%～102%。该方法操作简便,灵敏度高,重现性好,可满足实验室对水中总氮测定的要求。The total nitrogen in water was determined by indigo disulphonate spectrophotometry. Water samples were digested under a high temperature, and added with the chromogenic agent. Then the absorbance was determined at the wavelength of 610 nm. In the concentration of 0--80 mg/L, the linear equation was y=--0. 004 43x＋0. 382 7, and the correlation coefficient （R） was --0. 999 2. Spiked recoveries of samples were between 96% and 102%. This method is simple, and it has high sensitivity and good reproducibility. It is suitable for the determination of total ni trogen content in the water.

关 键 词：总氮 靛蓝二磺酸钠 分光光度法 

分 类 号：X832[环境科学与工程—环境工程]