2006 September – 2007 May: Mills Street Compensating Basin, Welshpool (WA). Pesticides: Multiple

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A baseline study of organic contaminants in the Swan and Canning catchment drainage system using passive sampling devices. Government of Western Australia Department of Water. December 2009

Mills Street, Compensation Basin, WA

Deployment period two; January – February 2007
The estimated concentration in water (CW) (ng/L) of herbicides predicted from ED passive samplers deployed in January – February 2007 in sub-catchments near Perth. The sampling rates used 0.12 L/day.

Diuron: (Replicate A) 190ng/ED, 50Cw. (Replicate B) 120ng/ED, 33Cw. 45 ND%

Simazine: (Replicate A) 43ng/ED, 11Cw. (Replicate B) 32ng/ED, 8.6Cw. 29 ND%

Atrazine: (Replicate A) 160ng/ED, 42Cw. (Replicate B) 110ng/ED, 28Cw. 37 ND%

Desethyl Atrazine: (Replicate A) 31ng/ED, 8.3Cw. (Replicate B) 14ng/ED, 3.7Cw. 76 ND%

Desisopropyl Atrazine: (Replicate A) <1ng/ED, <0.3Cw. (Replicate B) <1ng/ED, <0.3Cw. – ND%

Hexazinone: (Replicate A) 9.9ng/ED, 2.7Cw. (Replicate B) 5.6ng/ED, 1.5Cw. 55 ND%

Ametryn: (Replicate A) 32ng/ED, 8.6Cw. (Replicate B) 16ng/ED, 4.2Cw. 70 ND%

Mean ND 52%

The estimated concentration in water (ng/L) of insecticides predicted from PDMS passive samplers deployed during January – February 2007 in sub-catchments near Perth.

Phosphate Tri-n-butyl: 26ng/L (Replicate A), 18ng/L (Replicate B)

Trifluralin: 0.5ng/L (Replicate A), 0.3ng/L (Replicate B)

Diazinon: <6ng/L (Replicate A), <6ng/L (Replicate B)

Terbuthylazine: <8ng/L (Replicate A), <8ng/L (Replicate B)

Triallate: 0.9ng/L (Replicate A), 0.7ng/L (Replicate B)

Terbutryn: <3ng/L (Replicate A), <3ng/L (Replicate B)

Chlorpyrifos: 2ng/L (Replicate A), <0.5ng/L (Replicate B)

Chlordane Trans: 2ng/L (Replicate A), 2ng/L (Replicate B)

Dieldrin: <0.5ng/L (Replicate A), <0.5ng/L (Replicate B)

Propiconazole: 72ng/L (Replicate A), <3ng/L (Replicate B)

Mean ND%: 27

Deployment period three; April – May 2007
The estimated concentration in water (CW) (ng/L) of herbicides predicted from ED passive samplers deployed in January – February 2007 in sub-catchments near Perth. The sampling rates used 0.12 L/day.

Diuron: (Replicate A) 162ng/ED, 52Cw. (Replicate B) 138ng/ED, 44Cw. 16.4 ND%

Simazine: (Replicate A) 27ng/ED, 8.8Cw. (Replicate B) 26ng/ED, 8.5Cw. 3.1 ND%

Atrazine: (Replicate A) 14ng/ED, 4.8Cw. (Replicate B) 15ng/ED, 4.8Cw. 1.3 ND%

Desethyl Atrazine: (Replicate A) <1ng/ED, <0.3Cw. (Replicate B) <1ng/ED, <0.3Cw. – ND%

Desisopropyl Atrazine: (Replicate A) <1ng/ED, <0.3Cw. (Replicate B) <1ng/ED, <0.3Cw. – ND%

Hexazinone: (Replicate A) <1ng/ED, <0.3Cw. (Replicate B) <1ng/ED, <0.3Cw. – ND%

Mean ND 6.9%