顶空-气相色谱法(氮磷检测器)测定固定污染源废气中三甲胺

Determination of Trimethylamine in Exhaust Gas of Station Pollution Source with Headspace-Gas Chromatography Technology

建立了顶空-气相色谱法测定固定污染源废气中三甲胺的分析方法。弱酸性吸收液采集固定污染源废气中的三甲胺,碱液中和后顶空进样气相色谱仪氮磷检测器分析。并对平衡温度、平衡时间、盐析效应、氨水和氢氧化钠条件实验进行优化,在最佳实验条件下,三甲胺的方法检出限为0. 46μg/m^3(以采集20 L空气样品计),加标回收率为97%~107%,相对标准偏差在9. 26%以下。利用该方法对垃圾焚烧发电厂厂界空气及鱼粉厂有组织废气中三甲胺进行检测分析,该方法能够满足国家标准及上海地方标准中三甲胺排放限值的要求。

A simple method coupling headspace with gas chromatography(nitrogen-phosphorus detector)was developed to rapidly quantitative analyze trimethylamine in exhaust gas of station pollution source.Oven temperature,balance time,salting-out effect,the addition of ammonium hydroxide and sodium chloride were optimized systemically.Under optimum conditions,the detect limitation of the method of trimethylamine was 0.46μg/m^3(calculation with 20 L),and the recovery of trimethylamine were 97%-107%in real samples analysis,the relative standard deviation was under 9.26%(n=7).In addition,the method was used to determinate the amount of trimethylamine in air of waste incineration power plant and organized waste gas of fish meal plant.Finally,this method could meet the requirements of emission limit of trimethylamine of national standards and Shanghai local standards.