大气过氧化氢及有机过氧化物的测定

Detection of Hydrogen Peroxide and Organic Peroxides in Ambient Air

采用ＨＰＬＣ柱后衍生荧光法测定了５、６月份北京中关村地区大气中的Ｈ２Ｏ２和有机过氧化物．除Ｈ２Ｏ２外，共测出了７种以上有机过氧化物．有３种通过ＨＰＬＣ色谱保留时间得到了鉴定，分别是甲基过氧化氢（ＣＨ３ＯＯＨ，ＭＨＰ），羟甲基过氧化氢（ＨＯＣＨ２ＯＯＨ，ＨＭＨＰ）和乙基过氧化氢（ＣＨ３ＣＨ２ＯＯＨ，ＥＨＰ）．另外，还有４种未知有机过氧化物．Ｈ２Ｏ２和ＭＨＰ是大气中２种主要的过氧化物．ＭＨＰ浓度是Ｈ２Ｏ２浓度的２．７％－２２％，平均为９．３％．测得的Ｈ２Ｏ２的浓度范围从＜０．００１６—２．６５×１０－９（Ｖ／Ｖ），ＨＭＨＰ＜０．００１６—０．１７×１０－９（Ｖ／Ｖ），ＭＨＰ＜０．００２１—０．２８×１０－９（Ｖ／Ｖ）．在光照强，天气状况稳定的情况下，Ｈ２Ｏ２和ＭＨＰ呈现一定的日变化规律，一般是早晚较低，中午较高．Ｈ２Ｏ２和ＭＨＰ与大气中的Ｏ３具有一定的正相关关系而与ＮＯ和ＮＯ２呈现一定的负相关关系．

Measurements of H 2O 2 and organic peroxides in ambient air were made at Zhongguancun,Beijing of China in May?June by HPLC with HRP as catalyst and PHPAA as substrate.Except for H 2O 2,seven organic peroxides were detected,among which three organic peroxides were identified as methyl hydroperoxide(CH 3OOH,MHP),hydroxymethyl hydroperoxide(HOCH 2OOH,HMHP)and ethyl hydroperoxide(CH 3CH 2OOH,EHP)and other four organic peroxides were unknown.H 2H 2 and MHP are the two major peroxides.The concentration of MHP is 2 7%?22% of the H 2O 2 concentration.The concentration of H 2O 2 is <0 0016?2 65×10 -9 ,HMHP<0 0016?0 17×10 -9 ,MHP<0 0021?0 28×10 -9 .The diurnal variation of peroxides is regular with the lowest measured at morning and night and the highest near midday at the condition of weather being fine and stable.H 2O 2 and MHP show the same trend with zone but vary inversely with NO and NO 2.