Monitoring of malathion and its air impurities and environmental transformation products on surfaces and in air following an aerial application

Article Abstract:

A study involving the measurement of concentrations of malathion and its imputities from three sites after the 1990 aerial spraying in California. Oxidation and selective volatilization was used to transform the malathion spray to malaoxon. Gas chromatography with flame photometric and selected ion mass spectrometry detection were used to determine malathion and related phosphorous-containing impurities. Results indicate that aerial application of malathion was followed by extensive transformations in the mixture.

Health aspects, Malathion

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Application of tunable diode laser spectroscopy to the real-time analysis of engine oil economy

Article Abstract:

Consumers' perception of the quality of engines is influenced by engine oil economy. An engine that uses a large amount of oil is considered to have problems in its design and performance. The use of tunable diode laser spectroscopy (TDLAS) in the evaluation of oil economy was studied. TDLAS exhibited a high level of repeatability in determining oil consumption under steady-state conditions of engine operation. TDLAS may someday be used to measure other components of exhaust gas, such as aldehydes and methane.

Testing, Automobiles, Diesel motor, Diesel engines, Lubricating oils, Internal combustion engines, Laser spectroscopy, Automotive exhaust systems

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Octadecylthiol-modified surface-enhanced Raman spectroscopy substrates: a new method for the detection of aromatic compounds

Article Abstract:

Research was done at the University of Wyoming's Department of Chemistry on a new method for detecting aromatic organic compounds in groundwater. The method uses surface-enhanced Raman spectroscopy and roughened silver substrates coated with octadecylthiol. The method proved to have a high enough level of selectivity to resolve the three isomers of xylene, and displayed a high enough sensitivity to detect as little as 7.5 ppm of benzene and 2.3 ppm of naphthalene.

Environmental aspects, Pollution, Water, Underground, Groundwater, Aromatic compounds, Raman spectroscopy

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