Simultaneous determination of total dissolved nitrogen and total dissolved phosphorus in natural waters with an on-line UV and thermal digestion
Simultaneous determination of total dissolved nitrogen and total dissolved phosphorus in natural waters with an on-line UV and thermal digestion
复制标题
采用在线紫外和热消解法同时测定天然水中的总溶解氮和总溶解磷
DOI：
10.1016/j.talanta.2018.03.085
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发表时间：
2018
期刊：
影响因子：
6.1
通讯作者：
Yuan Dongxing
中科院分区：
文献类型：
--
作者：
Lin Kunning;Pei Junxian;Li Peicong;Ma Jian;Li Quanlong;Yuan Dongxing
建立了流动注射在线紫外光和热消解相结合同时测定天然水体中总溶解氮和总溶解磷的方法。一种新颖的流动歧管使所提出的系统结构紧凑，自动化程度高。采用流动注射技术，研究了不同消化模式和不同浓度的氮磷化合物转化为硝酸盐和磷酸盐的速率。采用单变量实验设计，对比色分析试剂浓度进行了优化。方法检出限分别为0.8 μm ol L−1和0.2 μm ol L−1，线性范围分别为30 0 μm ol L−1和2 5 μm ol L−1。样品处理量为5 h−1。天然水样的加标回收率分别为86.8%~102.6%和88.0%~102.0%。方法用于天然水样中总氮和总苯二酚的测定，结果与参考方法一致。研究结果表明，该方法既适用于常规分析，也适用于潜在的在线监测。
A flow injection method combined with an on-line UV and thermal digestion for simultaneous determination of total dissolved nitrogen (TDN) and total dissolved phosphorus (TDP) in natural waters was established in this study. A novel flow manifold made the proposed system compact and automatic. The conversion rates of various nitrogen and phosphorus compounds to their nitrate and phosphate forms with different digestion models and different concentrations were well investigated using the flow injection technique. The reagent concentrations for colorimetric analysis were optimized based on a univariate experimental design. The detection limits were 0.8 μmol L−1and 0.2 μmol L−1, and linear analytical ranges were up to 300 μmol L−1and 25 μmol L−1for TDN and TDP, respectively. The sample throughput was ~ 5 h−1. The recovery of spiked natural water samples varied from 86.8% to 102.6% for TDN and 88.0% to 102.0% for TDP. The present approach was successfully applied for the determination of TDN and TDP in natural water samples and was found to have good agreement with reference methods. The outcomes of present study indicated that the proposed method is suitable for routine analysis as well as for potential on-line monitoring.