在线镉柱还原—流动注射法测定水中硝酸盐氮和亚硝酸盐氮  

Determination of Nitrate Nitrogen and Nitrite Nitrogen in Waters by On-line Cadmium Reduction Flow Injection

作　　者：张雪茹 赵立晶[2] 陈金辉[2] 肖靖泽[2] 赵萍[2] 

机构地区：[1]洛阳市疾病控制中心,河南洛阳471000 [2]北京吉天仪器有限公司,北京100016

出　　处：《河南科技大学学报（医学版）》2010年第1期63-65,共3页Journal of Henan University of Science & Technology:Medical Science

摘　　要：目的探索一种测定水中硝酸盐氮和亚硝酸盐氮的简单快捷方法。方法利用在线镉柱还原—流动注射法,测定养殖海水、地表水、自来水、地下水等水样中的硝酸盐氮和亚硝酸盐氮。结果硝酸盐氮检出限为0.64μg/L,在20.0-2 000.0μg/L范围内呈理想线性关系,相关系数r=0.9999,相对标准偏差为0.97%,样品测定频率为60样/h,实际水样的加标回收率为90%-106%;亚硝酸盐氮的方法检出限为0.12μg/L,在2.0-200.0μg/L范围内呈理想线性关系,相关系数r=1.0000,相对标准偏差为0.35%,样品测定频率为90样/h,实际水样的加标回收率为92%-109%。结论在线镉柱还原—流动注射分析法简单快捷,测定结果满意。Objective To explore a new method of determining of nitrate nitrogen and nitrite nitrogen in waters by on-line cadmium reduction flow injection. Methods Using flow injection analysis method to determine nitrate nitrogen and nitrite nitrogen in saline waters. Results The liner range of nitrate nitrogen was 20.0～2 000.0 μg/L（r=0.9999）.The detection limit of nitrate nitrogen was 0.64 μg/L.The relative standard deviation was 0.97%,and the sample frequency of nitrate nitrogen was 60 samples/h.The recovery of nitrate nitrogen was 90%～106%.The liner range of nitrite nitrogen was 2.0～200.0 μg/L（r=1.0000）.The detection limit of nitrite nitrogen was 0.12 μg/L.The relative standard deviation was 0.35%,and the sample frequency of nitrite nitrogen was 90 samples/h.The recovery of nitrite nitrogen was 92%～109%. Conclusion The method is simple,rapid and has been used to determine nitrate nitrogen and nitrite nitrogen in water samples with satisfactory results.

关 键 词：流动注射 在线镉柱还原 硝酸盐氮 亚硝酸盐氮 

分 类 号：O657.3[理学—分析化学]