ABSTRACT
This case study relates to a suspect accused of shop-lifting a pair of underwear briefs from a department store. The report presents a method that was used to distinguish between new and used underwear employing both laser examination for biological staining and microscopical examination for thread wear.
Subject(s)
Body Fluids , Clothing , Microscopy/methods , Theft , Humans , Lasers , Textiles/standardsABSTRACT
Methods for the determination of paraquat are reviewed. Procedures are described in detail for the determination of paraquat in diverse materials such as food stuffs, body fluids, and water. The recommended procedures include visual spot test, spectrophotometric, gas chromatographic, and high performance liquid chromatographic techniques.
Subject(s)
Paraquat/analysis , Chromatography, Gas , Chromatography, High Pressure Liquid , Colorimetry , Food Analysis , Humans , Paraquat/urine , Water Pollutants, Chemical/analysisABSTRACT
Because of the difficulty in determining selenium directly, an indirect atomic-absorption method has been developed, based on two selective reactions that lead to the formation of the Pd(DanSe)(2)Cl(2) complex and measurement of the palladium absorption. Reaction conditions, separation techniques, effect of foreign ions, instrumental conditions and sample analysis in the sub-ppm range are described. The method is more sensitive than existing atomic-absorption methods for selenium.
ABSTRACT
Five analytical procedures, gravimetric, spectrophotometric, radiometric, fluorometric and atomic-absorption, have been developed for the determination of macro to submicro amounts of palladium. The methods are based on the reaction of PdCl(2), with naphtho[2,3-d]-2-selena-l,3-diazole. Analytical conditions such as the reaction time, concentration ranges, effect of pH and of 68 foreign ions, and solvent extraction were studied. Information relating to the structure and formula of palladium-piazselenol reaction products is included.
