Abstract：Objetive To establish the Sampling and Ion chromatography determination of ammonia in workplace air. Methods Ammonia in workplace air were sampled by methanesulfonic acid absorbing liquid,raeacted with methanesulfonic acid and generated the ammonium salts. The ammonium salts were separated by cationic chromatography column,determined by electrical conductivity detector,whose retention time was for qualitative and peak area was for quantitative. Results A quadratic correlation was (r=0.999) ranging from 0.32 to 30 μg/ml for ammonia, the limit of detection was 0.1 μg/ml and the limit of quantification was 0.32 μg/ml. The limit of was quantification was 0.21mg/m3 when using 7.5 L as standard condition sampling volume. The sampling efficiency of methanesulfonic acid absorbing liquid were more than 99%,and the relative standard deviation (RSD) of the method were less than 5%. Conclusions It is a simple,convenient,highly efficient,and less interference way to determinate the ammonia in workplace air. It can meet GBZ/T 210.4-2008, much less pollution than Nessler's reagent colorimetry, and might be further developed to be a standard determination method of ammonia in workplace air.
2015, Vol. 22 
