Collaborative testing of a manual sodium arsenite method for measurement of nitrogen dioxide in ambient air

Recent Advances In Air Pollution Analysis

“…This is intended to increase the rate of conversion of NO 2 to nitrite and gives a constant high collection efficient of 82%. 33 Nitric oxide and carbon dioxide are positive and negative interferents,-respectively, but cause an insignificant effect at normal urban pollutant levels, 33 In a collaborative test, it was concluded that this method will produce accurate, precise measurements of ambient NO 2 concentrations, 34 and indeed the method has been adopted by a number of air monitoring networks. The lower detection limit is reported as 8 |Ag/m~3.…”