Interlaboratory Calibration of Peroxyacetyl Nitrate Liquid Standards

Abstract Peroxyacetyl nitrate (PAN) solutions in the concentration range 10–100 μg PAN per ml solvent were distributed and analyzed by ten European laboratories. Overall precision accounting for standards' preparation, transport, storage and analysis resulted in standard deviations of 16 ± 8% of the mean for the high- and 25 ± 8% for the low-end of the concentration range. Following alkaline PAN hydrolysis, nitrite anions were determined, mostly by chemically suppressed ion chromatography, with better precision than the acetate anions.