An exhaustive steam-distillation and solvent-extraction unit for pesticides and industrial chemicals.

摘要: on techniques use an external steam generator that jets into the sample and collects chemicals by condensing volatile in a cooled flask. Although distillation is commonly used flavor drug analysis (NIELSON KRYGER 1969; SIEK LINDSAY 1968; TAMSMA et al. 1969), large surface areas of glassware low collection efficiency conventional apparatus have prevented as quantitative technique trace amounts less organic chemicals. Despite apparent shortcomings distillation, this offers unique possibilities analysis. The vapor pressures many pesticides industrial are appreciably greater than those water-soluble wastewaters sediments (MACKAY WOLKOFF 1973; STORHERR 1971). Moreover, high molecular weight triglyceride lipids fish warm-blooded animals. Because exhaustive solvent-extracti technique~ remove lipids, waxes, related natural products, well contaminants, extensive chromatographic separations necessary before extracts can be analyzed for We developed modified Nielsen-Kryger steam-distillati provides from water, sediments, tissue simultaneous extractior distillate small volume solvent. extract generally suitable direct gas-liquid chromatography (GLC) without time-consuming concentration cleanup procedures.