A comparison between high temperature catalytic and persulfate oxidation for the determination of total dissolved nitrogen in natural waters

作     者：Tiantian Ge Xue Yang Shan Jiang Liju Tan Tiantian Ge;Xue Yang;Shan Jiang;Liju Tan

作者机构：College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China Key Laboratory of Marine Chemistry Theory and Technology of Ministry of EducationOcean University of ChinaQingdao 266100China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2023年第42卷第4期

页      面：41-49页

核心收录：

学科分类：082803[工学-农业生物环境与能源工程] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0828[工学-农业工程] 070302[理学-分析化学] 0804[工学-仪器科学与技术] 0703[理学-化学] 

基　　金：The National Key Research and Development Project of China under contract No.2019YFC1407802 the Fund of State Environmental Protection Key Laboratory of Coastal Ecosystem under contract No.202112 the Open Fund of Key Laboratory of Marine Ecological Environment Science and Engineering Ministry of Natural Resources under contract No.MESE-2019-06 the National Natural Science Foundation of China under contract No.41876078 the Shandong Provincial Natural Science Foundation of China under contract No.ZR2018MD016 

主　　题：total dissolved nitrogen high-temperature catalytic persulfate oxidation natural waters 

摘      要：Total dissolved nitrogen(TDN) is an important parameter for assessing the nutrient cycling and status of natural *** accurate determination of TDN in natural waters is essential for assessing its contents and distinguishing different forms of nitrogen in the *** TDN in various systems has been largely documented,and the concentrations of TDN are usually obtained using high-temperature catalytic(HTC) or persulfate oxidation(PO).However,the accuracy of these methods and their suitability for all types of natural waters are still *** explore both methods in-depth,assorted samples were tested,including eight solutions composed of nitrogen-containing compounds(3 dissolved inorganic nitrogen fractions:NO_(3)^(-),NO_(2)^(-)and NH_(4)^(+);5 organic compounds:EDTA-2Na,vitamin B1,vitamin B12,amino acids,and urea) and 105 natural waters which were collected from an open ocean(Northwest Pacific Ocean,28),a marginal sea(Yellow Sea,34),an estuary(Huanghe River mouth,31),rivers(Huanghe River,4;Licun River,4),and precipitations(4 samples).The results showed that heterocycles and molecular dimensions had certain effects on the oxidation efficiency of the PO method but had little effect on *** was no significant difference between the two methods for natural waters,but HTC was more suitable for deep-sea samples with low TDN concentrations(less than 10 μmol/L) and low organic ***,HTC has a relatively simple measurement process,a high degree of automation,and low ***,HTC can be recommended to determine the TDN of samples in freshwater and seawater.