连续流动分析-分光光度法测定水和废水中总氮

摘要

对连续流动分析-分光光度法测定水和废水中总氮进行方法适用性验证，6家验证单位验证数据表明：方法在0 mg/L～10．0 mg/L范围内线性良好，相关系数为0．9996～0．9999；方法检出限为0．04 mg/L，测定下限为0．16 mg/L；6家实验室测定总氮标准溶液 RSD为0．4％～9．6％，测定总氮有证标准物质的结果在允许范围内，实际水样的加标回收率为92．0％～111％。该方法与国标方法同时测定多种类型的水样，结果无显著差异。探讨了影响该方法测定的干扰因素和消除方法，并提出方法应用要点。%Applicability of continuous flow analysis and spectrophotometric method to measure total nitrogen in water and waste water was studied.Calibration results of 6 laboratories showed good linear regression in con-centration range between 0 mg/L and 10.0 mg/L with correlation coefficient varied from 0.999 6 to 0.999 9.The method detection limit was 0.04 mg/L and the quantitation limit was 0.16 mg/L.The test results of certified ref-erence material was in the permission range,RSD ranged from 0.4% to 9.6%.The recovery rate of real water samples was between 92.0% ~1 1 1%.Therefore the aforesaid method shows no significant difference compared with national standard method.The interference factor and elimination method was discussed.