Contamination

Concentration > 0.05 μg/l

0 < Concentration < 0.05 μg/l

P-value

SITE 1

7 (50.0%)

7 (50.0%)

0.217

SITE 2

6 (40.0%)

9 (60.0%)

SITE 3

19 (73.1%)

7 (26.9%)

SITE 4

6 (37.5%)

10 (62.5%)

SITE 5

14 (48.3%)

15 (51.7%)

SITE 6

11 (44.0%)

14 (56.0%)

SITE 7

15 (60.0%)

10 (40.0%)