Reducing injuries and illnesses among construction workers.
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Accidents, Occupational↗
Biomedical subjects
J Palassis
Publications and source records attributed to J Palassis.
Portable infrared analyzers.
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Environmental Monitoring↗
Sampling and analytical determination of airborne tetramethyl and ethylene thiourea.
Tetramethyl and ethylene thiourea are collected from air using midget impingers containing 15 mL water. Ethylene thiourea may also be collected from air using PVC or cellulose ester membrane filters which are then extracted with water. Pentacyanoamineferrate reagent is added to the filter-extract or to the impinger contents to form a colored coordination complex. The absorbance of the solution is measured spectrophotometrically at 590 nm, and the unknown concentration of tetramethyl or ethylene thiourea samples is determined from calibration curves. The detection limit is 0.75 microg/sample for ethylene thiourea and 3 microg/sample for tetramethyl thiourea. Experimental results indicate that this method can be used as a general analytical method for the analysis of other thiourea-derived compounds.
Ethylenethiourea↗
The sampling and determination of azelaic acid in air.
Air samples of azelaic acid (nonanedioic acid), were collected on polyvinyl chloride (PVC) filters, extracted with ethanol, derivatized with N, O-bis(trimethylsilyl)trifluoroacetamide (BSTFA), containing 1% trimethylchlorosilane (TMCS) and analyzed by gas-liquid chromatography. The esterification product is the trimethylsilyl ester, which is different from the methyl ester usually chosen in the esterification processes. A calibration curve was used to determine the azelaic acid content in the filter samples. The detection limit was 1 microgram per sample. Results indicate that the analytical method can be applied to other monocarboxylic and dicarboxylic acids.
Air Pollutants↗