title: Effects of sampling techniques on physical parameters and concentrations of selected persistent organic pollutants in suspended matter.
abstract: This study focusses on the effect of sampling techniques for suspended matter in stream water on subsequent particle-size distribution and concentrations of total organic carbon and selected persistent organic pollutants. The key questions are whether differences between the sampling techniques are due to the separation principle of the devices or due to the difference between time-proportional versus integral sampling. Several multivariate homogeneity tests were conducted on an extensive set of field-data that covers the period from 2002 to 2007, when up to three different sampling techniques were deployed in parallel at four monitoring stations of the River Rhine. The results indicate homogeneity for polychlorinated biphenyls, but significant effects due to the sampling techniques on particle-size, organic carbon and hexachlorobenzene. The effects can be amplified depending on the site characteristics of the monitoring stations.
authors.affiliation: Federal Institute of Hydrology (BfG), Am Mainzer Tor 1, D-56068 Koblenz, Germany. pohlert@bafg.de
authors.forename: Thorsten
authors.initials: T
authors.lastname: Pohlert
authors.forename: Gudrun
authors.initials: G
authors.lastname: Hillebrand
authors.forename: Vera
authors.initials: V
authors.lastname: Breitung
mesh_terms: D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry; D005858:Germany; D006581:Hexachlorobenzene / Q000032:analysis / Q000737:chemistry; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry*; D010316:Particle Size; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000737:chemistry; D045483:Rivers / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data
chemical_list: D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D006581:Hexachlorobenzene; D011078:Polychlorinated Biphenyls