离子色谱法测定博物馆室内空气中氨的含量

Determination of Ammonia in Indoor Air of Museum by Ion Chromatography

对比了Dionex IonPac CS12A和IonPac CS16两种阳离子色谱柱的分离特性,通过优化色谱条件,使两种色谱柱分别适用于被动法和主动法空气采样分析。根据铵为弱碱性阳离子发生不完全电离的特点,提出了离子色谱法测定博物馆室内空气中氨浓度的方法。绘制了低浓度和高浓度两条标准曲线,线性范围分别为0.01-0.50 mg·L-1和0.50-5.00 mg·L-1,被动法采样法得氨的检出限（3S/N）为0.9 μg·L-1,回收率在97.2%-105.7%之间;主动法采样法得氨的检出限（3S/N）为1.6 μg·L-1,回收率在102.8%-104.7%之间。

Characteristics of separation on 2 kinds of cation chromatographic column, i. e. , the Dionex IonPac CS12A and IonPac CS16, were studied comparatively, and these 2 columns were made feasible to be used in combination with the methods of passive sampling and active sampling under optimum chromatographic conditions. Considering the incomplete ionization of the weakly alkaline NH＋ -ion, a procedure for IC determination of ammonia in indoor air of museum was proposed. Two standard curves, one for low concentrations （0. 01--0. 50 mg . L-1） and the other for high concentrations （0. 50--5. 00 mg. L-1 ） of NHa, were prepared. Value of detection limit （3S/ N） of 0. 9 μg . L-1 was obtained in case of passive sampling, and of 1.6/μg . L-1 in case of active sampling. Values of recovery found by standard addition method were in the range from 97. 2%- 105.7% for passive sampling, and in the range of 102. 8%--104.7% for active sampling.