Water-soluble organic nitrogen in the gas phase measured by the denuder–filter pack method

Figures & data

Table 1. Measurements of the WSON in the gas phase and fine-mode particles (PM_2.5) from the denuder–filter pack system, and in the fine-mode particles (PM₂) and coarse-mode particles (d > 2 μm) from the impactor with a backup filter. ‘S.D.’ and ‘I.R.’ denote the standard deviation and interquartile range, respectively. Unit is μg m⁻³ except for ‘n’.

	Gas phase	PM2.5	PM2	Coarse-mode
Mean	0.107	0.177	0.131	0.017
S. D.	0.105	0.090	0.064	0.017
Median	0.075	0.187	0.127	0.013
I. R.	0.075	0.119	0.079	0.017
Maximum	0.397	0.336	0.225	0.056
Minimum	0.000	0.009	0.000	0.000
n	12	12	12	12

Table 2. Measurements of gaseous basic WSON, acid WSON, NH₃, HNO₂ and HNO₃. ‘S.D.’ and ‘I.R.’ denote the standard deviation and interquartile range, respectively. Unit is μgN m⁻³ except for ‘n’.

	Basic WSON	Acid WSON	NH3	HNO2	HNO3
Mean	0.075	0.033	0.433	0.035	0.187
S.D.	0.054	0.061	0.117	0.031	0.064
Median	0.071	0.001	0.453	0.022	0.168
I.R.	0.042	0.032	0.162	0.029	0.058
Maximum	0.196	0.201	0.584	0.119	0.333
Minimum	0.000	0.000	0.241	0.010	0.119
n	12	12	12	12	12