【作者】 邱海鸥； 帅琴； 汤志勇； 林守麟；

【Author】 Qiu Haiou;Shuai Qin;Tang Zhiyong;Lin Shoulin;China University of Geosciences;

【机构】 中国地质大学应用化学系；

【摘要】 本文应用一种新型的四通道重力分相器,通过实验,选定了流动注射液-液萃取原子吸收间接测定硝酸根的最佳化学条件和仪器参数,方法的精密度RSD和检出限分别是为1.85%(0.25mg/L,n=10)和0.0028mg/L,测定速度为25样/h,用本系统测定水样中的硝酸根和亚硝酸根,加标回收率为100%-110%。更多还原

【Abstract】 Nitrate reacts with bis（2.9-dimethyl-1,10-phenanthrolinato）copper（I） to form an ion-pair which is subsequently-extracted into 4-methy 1- 2-pentanone.By measuring the atomic absorption signal of Copper in the organic phase,mixture of NOr and NO₂^- can be sequentially determined.In one aliquot of sample,nitrite is oxdised by Ce（Ⅳ）,so that total nitrate is determined.In another,nitrite is designed versatile phase separator has been applied to the extraction manifold.Experimental conditions and manifold parameters were investigated in detail.The proposed method is effective,with a detection limit of 0.028 mg/L of NO₃^-,the precision is 1- 85%RSD for 0.25 mg/L of NO₃^-（n=10） and a sampling rate of 25 samples per hour can be achieved.Recoveries of NO₃^- in water samples are 100%-110%.更多还原