Sampling sites of surface sediments

Organophosphate pesticides (OPs)

1

2

3

4

5

6

7

8

9

10

Mean ± SD

Molecular weight

Log K_ow

Water solubility (mg/L)

Chlorpyrifos

203.8

215.0

167.8

165.4

199.6

207.4

224.0

209.4

225.5

195.7

201.4 ± 20.7

350.6

4.5-5.3

0.3 - 1.4

Chlorpyrifos methyl

<2.0*

<2.0*

<2.0*

<2.0*

<2.0*

<2.0*

<2.0*

<2.0*

43.9

<2.0

322.5

4.3

4.0

Diazinon

<0.4*

<0.4*

<0.4*

<0.4*

<0.4*

<0.4*

<0.4*

<0.4*

<0.4

<0.4

304.3

3.8

<1.0

Dimethoate

<8.3*

<8.3*

<8.3*

<8.3*

<8.3*

<8.3*

<8.3*

<8.3*

78,999.6

78,651.7

78,825.7 ± 246.0

229.2

0.8

1 - 10.0

Dioxanthion

<1.0*

<1.0*

<1.0*

<1.0*

<1.0*

<1.0*

<1.0*

<1.0*

<1.0*

<1.0*

456.5

3.0

<0.1

^aEPN

<7.4*

<7.4*

<7.4*

<7.4*

<7.4*

<7.4*

<7.4*

<7.4*

<7.4*

<7.4*

323.3

4.8

Insoluble

Ethion

<1.9*

<1.9*

<1.9*

<1.9*

<1.9*

<1.9*

<1.9*

<1.9*

555.4

418.1

486.8 ± 97.1

384.5

5.1

2.0

Fenchlorphos

48.9

28.0

31.0

38.9

<0.3*

<0.3*

36.8

<0.3*

<0.3*

<0.3*

36.7 ± 8.1

321.5

5.1

1.0

Malathion

<6.6*

<6.6*

<6.6*

<6.6*

<6.6*

<6.6*

<6.6*

<6.6*

<6.6*

<6.6*

330.3

2.4

143.0

Parathion

<2.2*

<2.2*

<2.2*

<2.2*

<2.2*

<2.2*

<2.2*

<2.2*

<2.2*

<2.2*

291.2

3.8

11.0

Parathion methyl

<1.8*

<1.8*

<1.8*

<1.8*

<1.8*

<1.8*

<1.8*

<1.8*

<1.8*

<1.8*

263.2

2.9

37.7

Terbufos

<0.5*

<0.5*

<0.5*

<0.5*

<0.5*

<0.5*

<0.5*

<0.5*

<0.5*

<0.5*

288.4

4.5

5.1

∑OPs

252.7

243.0

198.8

204.3

199.6

207.4

260.8

209.4

79,824.4

79,265.5

16,086.6 ± 33,445.8

NR

NR

NR

p, p’-DDT

(organochlorine pesticide)

354.5

6.4 - 6.9

Insoluble