Development and application of a nitrogen oxides analyzer based on the cavity attenuated phase shift technique  

作　　者：Jun Zhou Wenjie Wang Yanfeng Wu Chunsheng Zhang Aiming Liu Yixin Hao Xiao-Bing Li Min Shao 

机构地区：[1]Institute for Environmental and Climate Research,Jinan University,Guangzhou 511443,China [2]Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality,Guangzhou 511443,China [3]Multiphase Chemistry Department,Max Planck Institute for Chemistry,Mainz 55128,Germany [4]Shenzhen National Climate Observatory,Shenzhen 518040,China

出　　处：《Journal of Environmental Sciences》2025年第4期692-703,共12页环境科学学报(英文版)

基　　金：supported by the Natural Science Foundation of Guangdong Province(No.2020A1515110526);the Key-Area Research and Development Programof Guangdong Province(No.2020B1111360003);the National Natural Science Foundation of China(No.42305096).

摘　　要：Nitrogen oxides(NO_(x))are crucial in tropospheric photochemical ozone(O_(3))production and oxidation capacity.Currently,the widely used NO_(x)measurement technique is chemiluminescence(CL)(CL-NO_(x)),which tends to overestimate NO_(2)due to atmospheric oxidation products of NO_(x)(i.e.,NO_(z)).We developed and characterized a NO_(x)measurement system using the cavity attenuated phase shift(CAPS)technique(CAPS-NO_(x)),which is free from interferences with nitrogen-containing species.The NO_(x)measured by the CAPS-NO_(x)and CL-NO_(x)analyzers were compared.Results show that both analyzers showed consistent measurement results for NO,but the NO_(2)measured by the CAPS-NO_(x)analyzer(NO_(2)_CAPS)was mostly lower than that measured by the CL-NO_(x)analyzer(NO_(2)_CL),which led to the deviations in O_(3)formation sensitivity regime and O_(x)(=O_(3)+NO_(2))sources(i.e.,regional background and photochemically produced O_(x))determined by the ozone production efficiencies(OPE)calculated from NO_(2)_CL and NO_(2)_CAPS.Overall,OPE_CL exceeded OPE_CAPS by 18.9%,which shifted 3 out of 13 observation days from the VOCs-limited to the transition regime when judging using OPE_CL,as compared to calculations using OPE_CAPS.During the observation period,days dominated by regional background O_(x)accounted for 46%and 62%when determined using NO_(2)_CL and NO_(2)_CAPS,respectively.These findings suggest that the use of the CL-NO_(x)analyzer tends to underestimate both the VOCs-limited regime and the regional background O_(x)dominated days.The newly built CAPS-NO_(x)analyzer here can promote the accurate measurement of NO_(2),which is meaningful for diagnosing O_(3)formation regimes and O_(x)sources.

关 键 词：Nitrogen oxides measurement Cavity attenuated phase shift (CAPS)technique Instrument development O_(3)formation regime O_(x)source 

分 类 号：F42[经济管理—产业经济]