A new simplified method for the determination of momentary concentrations of NO
2 and SO
2 in ambient air was studied by means of pre-concentration ion-chromatography. The procedure for the determination is as follows.
Sample is collected into an evacuated sampling tube (5l) . Absorption solution (deionized water, 50ml) and ozone (2 % in O
2) are added, and the tube is shaken for 10min.
Absorption solution is introduced to an ion chromatograph equipped with a pre-concentration column. Concentrations of NO
x and SO
x are obtained as those of NO
3-and SO
42-, respectively. This method allows the simultaneous analysis of NO
x and SO
x in ambient air. The relative standard deviations of the determinations (n=3) were 4.03% for NO
x and 3.16% for SO
x.
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