Table 2.

Precision and accuracy of the improved method No.12 for benzene and toluene analysis

compound	Conc. µg/ml	Intra-day Variation%CV	Inter-day Variation%CV	Accuracy (Recovery)
Benzene	25	7.13	8.26	100±6
Benzene	150	3.10	1.03	100±5
Benzene	300	1.12	1.85	100±3
Toluene	25	3.8	5.2	100±5
Toluene	150	1.06	2.8	100±4
Toluene	300	0.95	1.5	100±3