Summary
A simple and reliable method for routine measurement of ammonia in ambient air is described. It is based on the collection of ammonia on H3PO3-coated annular denuders and its subsequent derivatization withm-toluoyl chloride (MTC) in alkaline acetonitrile. The resultingm-toluamide is determined by reversed phase HPLC with UV detection at 230 nm. The limit of dotection is about 0.3μg m−3 for NH3 in air samples collected at 151 min−1 for one hour.
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Possanzini, M., Di Palo, V. Determination of atmospheric ammonia as m-toluamide by denuder sampling and HPLC-UV detection. Chromatographia 28, 27–30 (1989). https://doi.org/10.1007/BF02290378
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DOI: https://doi.org/10.1007/BF02290378