title: [Effect of pH of the aqueous medium on the extraction of substances with different acid-base properties].
abstract: Experimental data are described in the paper, which demonstrate the possibility of a simultaneous extraction of acid and basic substances and of ampholytes from biological liquid for their subsequent gas-chromatography screening by means of a mass-selective detector.
authors.forename: A B
authors.initials: AB
authors.lastname: Melent'ev
mesh_terms: D000143:Acids / Q000032:analysis*; D000327:Adsorption; D000468:Alkalies / Q000032:analysis*; D001826:Body Fluids / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006197:Hair / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D012015:Reference Standards; D015813:Substance Abuse Detection / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D000143:Acids; D000468:Alkalies; D014867:Water