Estimating pesticide sampling rates by the polar organic chemical integrative sampler (POCIS) in the presence of natural organic matter and varying hydrodynamic conditions.
The polar organic chemical integrative sampler (POCIS) was calibrated to monitor pesticides in water under controlled laboratory conditions. The effect of natural organic matter (NOM) on the sampling rates (R(s)) was evaluated in microcosms containing <0.1-5 mg L(-1) of total organic carbon (TOC). The effect of hydrodynamics was studied by comparing R(s) values measured in stirred (SBE) and quiescent (QBE) batch experiments and a flow-through system (FTS). The level of NOM in the water used in these experiments had no effect on the magnitude of the pesticide sampling rates (p > 0.05). However, flow velocity and turbulence significantly increased the sampling rates of the pesticides in the FTS and SBE compared to the QBE (p < 0.001). The calibration data generated can be used to derive pesticide concentrations in water from POCIS deployed in stagnant and turbulent environmental systems without correction for NOM.
Senator George J. Mitchell Center for Environmental and Watershed Research, University of Maine, Orono, ME 04469, USA.
Lucner
L
Charlestra
Aria
A
Amirbahman
David L
DL
Courtemanch
David A
DA
Alvarez
Howard
H
Patterson
D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D057446:Hydrodynamics; D007700:Kinetics; D009930:Organic Chemicals / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry* / Q000302:isolation & purification; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification
D009930:Organic Chemicals; D010575:Pesticides; D014874:Water Pollutants, Chemical