دانشگاه: State University of New York College of Environmental Science and Forestry
: 3.4 MB
Abstract: MONITOR is an active, automatic extraction sampler that collects daily, integrated extracts of hydrophobic compounds in water. Compounds partition from water, through a polydimethylsiloxane membrane and into hexane. The sampling rate, membrane-water partition coefficients (KMW) and hexane-water partition coefficients (KHW) were determined for atrazine and four nonpolar reference compounds. The reference compounds had high effective sampling rates (>10 L/day) while atrazine had a low effective sampling rate (<1 L/day). Atrazine had intermediate hydrophobicity as determined by KMW and octanol-water partition coefficient (KOW). However, atrazine had a low KHW, which caused its low sampling rate. In spite of MONITOR\'s low sampling rate for atrazine, the concentration of atrazine in the drinking water of Syracuse, New York was observed from March - November 2012 using MONITOR. The average concentration was 0.016 μg/L. MONITOR was able to capture fluctuations in the concentration of atrazine at very low levels over several months.