Table 2.

Performance evaluation of HF measurements from test atmospheres.

Concentration (mg/m3)	Mini sampler			Cassette
	SD1	RSD2	U 3	SD1	RSD2	U 3
0.25	0.008	3.3	0.20	0.007	2.9	0.22
1.2	0.037	2.8	0.19	0.041	1.7	0.19
2.3	0.031	1.4	0.21	0.030	1.4	0.18
5.0	0.081	1.9	0.16	0.077	1.6	0.16

¹Standard deviation.

²Relative standard deviation.

³Expanded measurement uncertainty (in accordance with UNI EN 482:1998).