离子色谱法测定废气中甲酸  

Determination of formic acid in exhaust gas by ion chromatography

作　　者：谢永洪[1] 杨坪[1] 钱蜀 张丹[1] 张新申[2] 赵云芝[1] 程小艳[1] 

机构地区：[1]四川省环境监测中心站,四川成都610041 [2]四川大学皮革化学与工程教育部重点实验室,四川成都610065

出　　处：《冶金分析》2009年第11期13-18,共6页Metallurgical Analysis

摘　　要：采用离子色谱法分离电导检测废气中甲酸的含量。考察Dionex IonPac AS18和Ion-PacAS11-HC色谱分离柱在不同淋洗液浓度条件下对甲酸的分离效果，淋洗液流速对分离的影响。讨论绘制校准曲线时标准溶液介质的选择。结果表明：当用DionexIonPacAS18柱，5mmol／L氢氧化钾为淋洗液，以1.0mL／min的淋洗速度进行梯度洗脱并用吸收液配制校准曲线的标准溶液时可达到预期废气中甲酸分析的目的。该法线性范围为0.1-10mg／L和10-100mg／L，检出限为0.007mg／m^3。用本法测定甲酸生产装置30m高度排气筒废气中的甲酸回收率为88％-104％。Formic acid in exhaust gas was separated by ion chromatography and determined by conduc- tivity method. The effects of eluent concentration and flow velocity on sample separation in Dionex IonPac AS18 and IonPac AS11-HC columns were investigated. The selection of medium for standard solution to plot calibration curve was also discussed. It was found that the samples could be well sepa-rated in Dionex IonPac AS18 column with 5 mmol/L potassium hydroxide as eluent at a gradient elution rate of 1.0 mL/min . Then, the analysis could be achieved by using absorption solution to plot calibration curve. The linear ranges of proposed method were 0.1-10mg/L and 10-100mg/L, and the detection limit was 0.007mg/m^3. The recoveries ranging from 88 % to 104 % were achieved when this method was used to determine formic acid in exhaust gas discharged from 30-meter chimney in formic acid manufacturing plant.

关 键 词：离子色谱法 电导检测 甲酸 废气 分离柱 

分 类 号：X831[环境科学与工程—环境工程]