Rudling J, Hallberg B O, Hultengren M, Hultman A
Scand J Work Environ Health. 1984 Jun;10(3):197-202. doi: 10.5271/sjweh.2350.
Three methods for measuring ammonia in air have been evaluated. Filters impregnated with 10% (volume/volume) phosphoric acid in methanol were used for two methods. Sampling was done either with a filter cassette connected to a pump or with the filters placed in a passive monitor (Gasbadge). The filters were leached with distilled water after the sampling and analyzed with ion chromatography or colorimetry (Nessler). The third method tested was a colorimetric air-monitoring badge system (ProTek). The tests showed that the accuracy of the filter methods is good and that the results are not affected by humidity. If ion chromatography is used for the analysis, amines do not interfere. The Gasbadge monitors increased their uptake when the air velocity over the sampler was raised from 0.2 to 1.0 m/s. The accuracy of the ProTek method was poor, the method was biased, and blank samples showed high values. In field tests carried out in a foundry and at a fertilizer plant, the agreement between the filter methods was good, whereas the results of the ProTek method deviated drastically from those of the other methods.
对三种空气中氨的测量方法进行了评估。两种方法使用了浸渍有10%（体积/体积）甲醇磷酸溶液的过滤器。采样通过连接泵的过滤盒或置于被动式监测仪（气体徽章）中的过滤器进行。采样后，过滤器用蒸馏水浸提，并采用离子色谱法或比色法（纳氏试剂法）进行分析。测试的第三种方法是比色空气监测徽章系统（ProTek）。测试表明，过滤法的准确性良好，结果不受湿度影响。如果采用离子色谱法进行分析，胺类不会产生干扰。当采样器上方的空气流速从0.2米/秒提高到1.0米/秒时，气体徽章监测仪的吸收量增加。ProTek方法的准确性较差，该方法存在偏差，空白样品显示出高值。在铸造厂和化肥厂进行的现场测试中，过滤法之间的一致性良好，而ProTek方法的结果与其他方法的结果有很大偏差。
