1990 年 6 巻 6 号 p. 843-849
The authors have developed an analytical method for extracting trace amounts of 15 hydrophilic compounds in water using gas chromatography/mass spectrometry coupled with an activated carbon preconcentration procedure. As internal standards, perdeuterated p-dioxane and N, N-dimethylformamide were added to 11 of a water sample; the water was passed through a granular activated carbon column. Organic substances adsorbed on the activated carbon were eluted with acetone and dichloromethane; the extract was then concentrated to 10ml with a Kuderna-Danish concentrator. Quantitative analyses using GC/MS with a selected ion monitor (GC/MS-SIM) were performed to measure the recovery efficiencies of the 15 compounds spiked into water samples at concentrations of 0.2 and 2.0μg/l. The recovery efficiencies through the internal standard method of the compounds, except alcohols and acetonitrile, gave more than 90% and their relative standard deviations were less than 7% at a concentration of 0.2μg/l. In this study, it was confirmed that the activated carbon preconcentration procedure is useful for extracting trace amounts of polar compounds which have a log P value (dichloromethane-water partition coefficient) greater than -0.5, except for compounds containing a hydroxy group or having a very small molecular weight. The method was applied to the analysis of river water and seawater for polar compounds. p-Dioxane, 1-propanol, N-nitrosodimethylamine, N-nitrosodiethylamine, N, N-dimethylformamide and N, N-dimethylacetamide were detected below the μg/l level.
