00000nam 2200000zi 4500 9.868605 CaOODSP 20241203113646 m o d f cr ||||||||||| 190220s2004 onc #ot f|0| 0 eng d CaOODSP eng rda CaOODSP n-cn--- En13-5/04-174E-PDF Brownlee, B. G., author. An analytic method for shipboard extraction of the odour compounds, 2-methylisoborneol and geosmin / Brian Brownlee [and five others]. Burlington, Ontario : National Water Research Institute, Environment Canada, [2004] 1 online resource (16 pages) text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 04-174 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographic references. "Extractions for the analysis of geosmin and 2-methylisoborneol (MIB) were carried out on board a research vessel by extracting water samples in the collection bottles with dichloromethane. The extracts are stable and can be stored for up to two months with no apparent loss of analytes. Workup and analysis could be done at the rate 15-20 samples per week. Approximately 150 samples from Lake Ontario were analyzed in 2000 and 120 samples in 2001. Concentrations as low as 1 ng/L could be detected, but reliable determination was only attained above 5 ng/L (> 30% qualifier ion match within 150%). Reproducibility between duplicates was generally better than 10%, and recovery of surrogate standards from reagent water averaged ca. 80% and from lake water ca. 60%. In early Septernber, 2000, geosmin concentrations in Lake Ontario ranged from 1-13 ng/L and MIB from 1-31 ng/L. In 2001, the ranges were 1-47 and 1-56 ng/L for geosmin and MIB, respectively. Lowest concentrations occurred in the western and central regions and highest concentrations in the eastern region and St. Lawrence River"--Abstract. gccst Lakes gccst Water management Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; 04-174. (CaOODSP)9.844121 PDF 943 KB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-04-174-eng.pdf