Sample

Pesticide Residue (ppb)

Before

After

Mean ± SD

1st

2nd

BRH

Atrazine

6.2

0.34

0.28

0.31 ± 0.04

Clomazone

2.4

1.12

0.84

0.98 ± 0.20

Desethylatrazine

0.62

0.5

0.34

0.42 ± 0.01

Metribuzin

0.34

0.24

0.22

0.23 ± 0.01

Metolachlor

17.2

10.16

7.82

8.99 ± 1.66

Metalaxyl

0.08

0.04

0.04

0.04 ± 0.00

Propanil

0.08

ND

ND

NA

Dimethenamid

0.16

ND

ND

NA