Passive Sampling of Bioavailable Organic Chemicals in Perry County, Missouri Cave Streams

• Published in: Environmental science & technology 2010-12, Vol.44 (23), p.8835-8841
• Main Authors: Fox, J. Tyler, Adams, Ginny, Sharum, Martin, Steelman, Karen L
• Format: Article
• Language: English
• Subjects: Applied sciences; Aquatic ecosystems; Bioavailability; Caves; Characterization of Natural and Affected Environments; Creeks & streams; Environment; Environmental Monitoring - instrumentation; Environmental Monitoring - methods; Environmental science; Exact sciences and technology; Gas Chromatography-Mass Spectrometry; Hydrocarbons, Chlorinated - analysis; Hydrocarbons, Chlorinated - chemistry; Hydrocarbons, Chlorinated - toxicity; Missouri; Organic chemicals; Organic Chemicals - analysis; Organic Chemicals - chemistry; Organic Chemicals - toxicity; Organic chemistry; Pesticides - analysis; Pesticides - chemistry; Pesticides - toxicity; Pollution; Rivers - chemistry; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - toxicity; Water Pollution, Chemical - statistics & numerical data
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/es1019367

Two types of passive samplerssemipermeable membrane devices (SPMDs) and polar organic chemical integrative samplers (POCIS)—were deployed in spring 2008 to assess bioavailable concentrations of aquatic contaminants in five cave streams and resurgences in Perry County, Missouri. Study sites represent areas of high cave biodiversity and the only known habitat for grotto sculpin (Cottus carolinae). Time-weighted average (TWA) water concentrations were calculated for 20 compounds (n = 9 SPMDs; n = 11 POCIS) originating primarily from agricultural sources, including two organochlorine insecticides, dieldrin and heptachlor epoxide, which were found at levels exceeding U.S. EPA criteria for the protection of aquatic life. GIS data were used to quantify and map sinkhole distribution and density within the study area. Infiltration of storm runoff and its influence on contaminant transport were also evaluated using land cover and hydrological data. This work provides evidence of cave stream contamination by a mix of organic chemicals and demonstrates the applicability of passive samplers for monitoring water quality in dynamic karst environments where rapid transmission of storm runoff makes instantaneous water sampling difficult.