<p> 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 (K<sub>MW</sub>) and hexane-water partition coefficients (K<sub>HW</sub>) 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 K<sub>MW</sub> and octanol-water partition coefficient (KOW). However, atrazine had a low K<sub>HW</sub>, 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.</p>
| Identifer | oai:union.ndltd.org:PROQUEST/oai:pqdtoai.proquest.com:1568948 |
| Date | 20 November 2014 |
| Creators | Salley, Dara C. |
| Publisher | State University of New York Col. of Environmental Science & Forestry |
| Source Sets | ProQuest.com |
| Language | English |
| Detected Language | English |
| Type | thesis |
Page generated in 0.0019 seconds