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41.
Raoul Beunen Catharinus F. Jaarsma Rob N. A. Kramer 《Journal of Coastal Conservation》2004,10(1):109-118
Accurate and sufficiently detailed information about recreation-related use of dune areas is necessary for their management.
Long-term monitoring can provide this information. This paper presents the visitor counting programme used in the Meijendel
dune area since 1992. The data collected during the first ten years are used to evaluate the method. The combination of mechanical
vehicle counts and additional visual counts proved to be reliable and produced an accurate data set. Costs could be reduced
through eventually reducing the number of counting locations and limiting the number of visual counts. 相似文献
42.
Maqbool U Anwar-ul-Haq Qureshi MJ Iqbal MZ Hock B Kramer K 《Journal of environmental science and health. Part. B》2002,37(4):307-322
A highly sensitive enzyme immunoassay is described for the detection of atrazine residues in water. Atrazine derivative was conjugated to Bovine Serum Albumin (BSA) to obtain an immunizing antigen and to Horseradish Peroxidase enzyme (POD) to obtain a marker for immunoassay. The formation of these conjugations was confirmed by UV spectroscopy as well as by gel-electrophoresis. Polyclonal antibodies were raised in rabbits by immunization with an atrazine-BSA conjugate containing 29 atrazine residues per BSA molecule. An ELISA on microtitration plates was optimized with peroxidase-atrazine conjugate. The middle of the test (50% B/Bo) was found to be at 90 ng/l, which is well below the maximum concentration permitted by the EC guidelines for drinking water. Detection limits for atrazine of about 1 ng/l could be reached. The assay did not require concentration or cleanup steps for drinking or ground water samples. Validation experiments showed good accuracy and precision. No cross-reactivities were shown by other s-triazines like terbutryn, ametryn, terbuthylazine, des-isopropylatrazine, and de-ethylatrazine except hydroxyatrazine. The latter was present at very low levels that can be calibrated/standardized before analysis or it may be considered as leftover residues of atrazine. Based on these results, it is suggested that this test can be applied to obtain fairly accurate results for atrazine concentration in water samples from different sources. 相似文献
43.
Bester K de Vos P Le Guern L Harbeck S Hendrickx F Kramer GN Linsinger T Mertens I Schimmel H Sejerøe-Olsen B Pauwels J De Poorter G Rimkus GG Schlabach M 《Chemosphere》2001,44(4):529-537
In this article, the production and validation of a new certified reference material "PCBs in animal fat" for the control of the maximum level of 200 ng/g setup by the European Communities for veterinary products from Belgium is described. Three materials are established: a blank, one material with about 100 ng/g and one with about 200 ng/g (sum of seven PCBs). Data on the production and certification are given. Additionally, this material was used as an unknown test material in the quality assurance program of the Belgium meat monitoring system (before the certification of the material). While the certification was performed with an uncertainty of less than 10%, the round robin exhibited larger deviations. However, these deviations were less than 20% for most of the 30 participating laboratories. Only two had significantly higher deviations. 相似文献
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