HEALTH RISK ASSESSMENT RELATED TO DERMAL EXPOSURE OF CHLORPYRIFOS: A CASE STUDYOF RICE GROWING FARMERS IN NAKHON NAYOK PROVINCE, CENTRAL THAILAND Sattamat Lappharat1,2, Wattasit Siriwong3,5,*, Nutta Taneepanichskul3, Marija Borjan4 and Mark Robson4,5 1 International Postgraduate Program in Environmental Management, Graduate School, Chulalongkorn University Thailand 2 Center of Excellence on Hazardous Substance Management (HSM), Chulalongkorn University, Thailand 3 College of Public Health Sciences (CPHS), Chulalongkorn University, Bangkok 10330 Thailand 4 School of Environmental and Biological Sciences, Rutgers University, New Brunswick, NJ, USA 5 Thai Fogarty ITREOH Center, Chulalongkorn University, Bangkok, Thailand *corresponding author: [email protected] ABSTRACT: To date, pesticides, especially organophosphate pesticide such as chlorpyrifos have been frequently applied to paddy fields over time to maintain product quality, protect agricultural crops from various pests and increase yield. This study evaluates dermal exposure to chlorpyrifos in rice farmers along with providing a health risk assessment. The face-to-face questionnaire was completed by interviewing from 35 participants. Thirty-five rice farmers participated and completed an in person interview. Patch technique was used to evaluate dermal exposure. The chlorpyrifos residue was extracted from the gauze patches and quantified by gas chromatography equipped with flame photometric detector (GC-FPD). The results showed that chlorpyrifos concentrations were greater in males (526.34 mg/kg) than females (500.75 mg/kg). Average daily dose on 7 points of male and female farmers were 31.72x10-4, 193.32x10-4, 5.38x10-4, 190.48x10-4, 170.47x10-4, 465.91x10-4, and 43.04x10-4mg/kg-day, respectively. Hazard Quotient (HQ) at mean and 95th percentile level at 7 positions of farmer’s body of both male and female was greater than acceptable level (HQ >1). This study concluded that rice-growing farmers in this area may be getting risk from non-carcinogenic and adverse health effects from dermal exposure to continuously use of chlorpyrifos. Keywords: Dermal exposure/ Chlorpyrifos/ Patch technique/ Health risk assessment
Posted on: Tue, 06 Aug 2013 04:38:35 +0000
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