水中总磷和总氮含量的离子色谱测定法  

Determination of Total Phosphorus and Nitrogen in Water by Ion Chromatography

作　　者：丁明军[1] 杨慧中[1] 

机构地区：[1]教育部轻工过程先进控制重点实验室,江南大学,无锡214122

出　　处：《分析化学》2012年第3期381-385,共5页Chinese Journal of Analytical Chemistry

基　　金：无锡市污染防治基金(No.2008-1)资助项目

摘　　要：采用紫外光-臭氧氧化结合离子色谱法对氧化消解后的水样同时进行总磷和总氮的测定。配制Na2CO3/NaHCO3淋洗液,采用1 mL定量环,大体积直接进样。在优化工作条件下,总磷在0.05～5.00 mg/L,总氮在0.10～10.0 mg/L范围内线性良好,线性相关系数分别为0.9999和0.9998,总磷和总氮检出限为分别3.60和4.57μg/L;总磷和总氮的检测相对标准偏差(RSD)分别低于4.9%和4.1%,总磷加标回收率为95.0%～105.0%,总氮加标回收率为93.0%～103.0%。自然环境水样检测与真实值相对偏差小于4.2%。本方法选择性好,灵敏度高,精密度和准确度高,用于实际水样中总磷和总氮含量测定的结果与国标法(GB11894-89,GB11893-89)An ion chromatography combined with ultraviolet-ozone oxidation procedure was proposed for detecting total phosphorus（TP） and total nitrogen（TN） simultaneously in water samples.The mixed solution of Na2CO3/NaHCO3 was used as eluent,and the samples were injected with 1 mL large volume loop directly.Under the optimal conditions,TP concentration displays linear relationship in the range of 0.05-5.00 mg/L and TN concentration in the range of 0.10-10.00 mg/L.The correlation coefficient of curve was 0.9999 and 0.9998 respectively.The detection limit of TP was 3.60 μg/L and that of TN was 4.57 μg/L.The relative standard deviations（RSD） of TP and TN were less than 4.9 and 4.1% respectively.The standard addition recoveries of TP were from 95.0% to 105.0%,and those of TN were from 93.0% to103.0%.The relative error for the analysis of natural water samples to the standard were less than 4.2%.The method proposed has good selectivity and high sensitivity,as well as precision.The determination results agree well with those obtained by the National standard method.

关 键 词：离子色谱法 紫外光-臭氧氧化 总磷 总氮 

分 类 号：X832[环境科学与工程—环境工程] O657.75[理学—分析化学]