分光光度法测定大气降水中过氧化氢  

Spectrophotometric Determination of Hydrogen Peroxide in Atmospheric Precipitation

作　　者：王瑜[1] 孙觅[2] 王立霞[1] 

机构地区：[1]沧州师范学院化学与环境科学系,沧州061001 [2]桂林理工大学化学与生物工程学院,桂林541004

出　　处：《理化检验（化学分册）》2013年第1期91-93,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在磷酸介质中,过氧化氢氧化I^-形成I_3^-络阴离子;在脂肪醇聚氧乙烯醚硫酸钠(AOES)中I_3^-进一步与亚甲基蓝作用形成离子缔合物,最大吸收波长位于530 nm处。过氧化氢浓度与吸光度呈线性关系,据此建立了分光光度法测定大气降水中过氧化氢含量的方法。过氧化氢的浓度在1.7×10^(-6)～2.5×10^(-5)mol·L^(-1)范围内遵守比耳定律,表观摩尔吸光率为4.12×10~4 L·mol^(-1)·cm^(-1),方法的检出限(3s/k)为2.1×10^(-7) mol·L^(-1)。方法用于大气降水中过氧化氢的测定,加标回收率在94.3%～105%之间,测定值的相对标准偏差(n=5)在1.4%～3.2%之间。In a HaPO4 medium, the complex anion I3^- was formed by the oxidation of I- with H202 ; and in the solution of aliphatic alcohol-polyoxyethylene ether sodium sulfate （AOES）, an ion-association complex was formed by the reaction of I：~ with methylene blue, having the maximum absorption wavelength at 530 nm. Range of linearity and value of apparent molar absorptivity found were 1.7× 10^- 6 --2.5× 10^-5mol · L^- 1 and 4. 12× 10^4L · mol^-1 · cm^-1 respectively, and detection limit （3s/k） was 2. 1× 10^-7mol · L^- 1. Based on these factors, a method of spectrophotometry for determination of H2O2 in atmospheric precipitation was proposed. Recovery of the method was tested by standard addition method, values of recovery found were in the range of 94.3%- 105% with RSD＇s （n=5） in the range of 1.4% 3.2%.

关 键 词：分光光度法 大气降水 过氧化氢 亚甲基蓝 离子缔合物 

分 类 号：O657.32[理学—分析化学]