顶空平衡-气相色谱法测定水中溶解氢气及其应用  

Determination of dissolved hydrogen and air-water hydrogen flux using headspace-gas chromatography and its applications

作　　者：潘凤梅 臧昆鹏 温军 申小龙 魏康轩 兰文港 胡智伟 陈啸鸣 陈炳江 李珊 鲁嫣冉 陈丽涵 郭朋 林溢 陈圆圆 刘硕[1,2] 徐宏辉 方双喜 PAN Fengmei;ZANG Kunpeng;WEN Jun;SHEN Xiaolong;WEI Kangxuan;LAN Wengang;HU Zhiwei;CHEN Xiaoming;CHEN Bingjiang;LI Shan;LU Yanran;CHEN Lihan;GUO Peng;LIN Yi;CHEN Yuanyuan;LIU Shuo;XU Honghui;FANG Shuangxi(College of Environment,Zhejiang University of Technology,Hangzhou,310014,China;Zhejiang Carbon Neutral Innovation Institute,Zhejiang University of Technology,Hangzhou,310014,China;Zhejiang Meteorological Science Institute,Hangzhou,310014,China)

机构地区：[1]浙江工业大学环境学院,杭州310014 [2]浙江工业大学浙江碳中和创新研究院,杭州310014 [3]浙江省气象科学研究所,杭州310014

出　　处：《环境化学》2025年第1期121-130,共10页Environmental Chemistry

基　　金：国家重点研发计划项目(2020YFA0607501);国家自然科学基金(42275113);浙江省自然科学基金联合基金(LZJMZ23D050002);浙江省基础公益研究计划项目(LGF22D050004)资助。

摘　　要：将顶空平衡法与配置脉冲氦离子化检测器的气相色谱仪相结合,自主设计并优化建立了适用于水中溶解氢气(H_(2))浓度测定的自动化观测系统和方法.测试结果表明,该观测系统对H_(2)摩尔比范围为550.2×10^(−9)—4000×10^(−9)标气的线性优于0.9995(R^(2)),精密度优于0.07%,准确度优于1.09%,重复性测试结果优于世界气象组织/全球大气观测网的质控要求.基于亨利定律和道尔顿分压定律,推导了更简便实用的溶解H_(2)浓度计算公式.基于该观测系统和方法,于2022年8月开展了京杭运河杭州段溶解H_(2)浓度及水-气H_(2)交换通量的观测研究.结果显示,京杭运河杭州段溶解H_(2)浓度和水-气H_(2)通量的范围分别为216.9—409.4 nmol·L^(−1)和172.1—20513.1μmol·(m^(2)·d)^(−1),是大气H_(2)净排放源,且城区比乡村河段的溶解H_(2)浓度平均高29.6 nmol·L^(−1),表明人为活动是影响淡水系统H_(2)源强和排放量的重要因素之一.A new head-space gas chromatography system equipped with a pulsed discharge helium ionization detector and method,which could automatically measure dissolved hydrogen(H_(2))concentration in water samples,was self-assembled and established.Test results showed that,the system’s linear regression coefficient(R^(2)),precision and accuracy were better than 0.9995,0.07%and 1.09%,respectively,which met well the criterion of the World Meteorological Organization/Global Atmosphere Watch.According to the Henry's Law and Dalton's Law,a new formula was improved for calculated dissolved H_(2)concentration.Based on the self-established system and method,dissolved H_(2)concentration and its air-water flux in the Beijing-Hangzhou Canal in Hangzhou City was observed in August 2022.Results showed that,dissolved H_(2)concentration and air-water H_(2)flux ranged from 216.9 nmol·L^(−1)to 409.4 nmol·L^(−1)and 172.1μmol·(m^(2)·d)^(−1) to 20513.1μmol·(m^(2)·d)−1,respectively,indicated the survey area was net source of atmospheric H_(2).Moreover,mean dissolved H_(2)concentration was 29.6 nmol·L^(−1)higher in urban region than that in rural region,indicated anthropogenic activity might be a potential key regulate factor of source strength of dissolved H_(2)in freshwater ecosystem.

关 键 词：溶解H_(2) 水-气通量 顶空平衡法 气相色谱 饱和度 

分 类 号：X-1[环境科学与工程] O6[理学—化学]