Determination of pesticides and polychlorinated biphenyls in water: a low-solvent method

Article Abstract:

A new analytical method for measuring the concentration of pollutants in the water was developed to replace EPA's 'Method 608.' Samples are passed through octadecylsilica disks, filtered and extracted with supercritical carbon dioxide to separate the extract from the effluent. The method analyzes the extract either through electron-capture mass spectroscopy or single gas chromatography. It cuts down testing time in half, reduces amounts of solvent used and increases amount of extract recovered to as much as 80%.

Methods, Analysis, Polychlorinated biphenyls, Pesticides, Chromatography, Extraction (Chemistry), Chromatographic analysis

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Fate and transport of Detroit River derived pollutants throughout Lake Erie

Article Abstract:

Electron impact gas chromatographic mass spectrometry was used to analyze Lake Erie pollutants derived from the Detroit River. The spectrometric analysis was conducted on the sediment-bound pollutant 2,4-di-tert-pentylphenol (24DP). The maximum deposition of 24DP in Lake Erie occurred between 1966 and 1970. The western basin of the lake received 73% of the pollutants derived from the Detroit River. The central basin received about 20% of the pollutants, and the eastern basin received about 5%.

Environmental aspects, Pollution, Pollutants, Lake Erie, Detroit River

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Effects of tempearture and wind direction on the atmospheric concentrations of alpha-endosulfan

Article Abstract:

The density of the contact insecticide endosulfan in the air of Bloomington, IN, was investigated to determine the effect of temperature and wind direction on atmospheric concentration. The results showed that atmospheric temperature had a significant effect on concentration. The effect of wind direction and other meteorological conditions was only moderate. Concentration peaked when the air was warmest and the wind was blowing from the east.

Measurement, Atmospheric circulation, Insecticides, Atmospheric temperature

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