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Simultaneous quantification of poly-dispersed anionic, amphoteric and nonionic surfactants in simulated wastewater samples using C18 high-performance liquid chromatography-quadrupole ion-trap mass spectrometry.
J Chromatogr A
January 2005
Dynamac Corporation, Space Life Science Laboratory, Kennedy Space Center, FL 32899, USA.
This paper describes the development of a guantitative method for direct and simultaneous determination of three frequently encountered surfactants, amphoteric (cocoamphoacetate, CAA), anionic (sodium laureth sulfate, SLES), and nonionic (alcohol ethoxylate, AE) using a reversed-phase C18 HPLC coupled with an ESI ion-trap mass spectrometer (MS). Chemical composition, ionization characteristics and fragmentation pathways of the surfactants are presented. Positive ESI was effective for all three surfactants in agueous methanol buffered with ammonium acetate.
View Article and Find Full Text PDF[Comparative study of formation of the frontal cortex of the brain of monkeys and man in ontogenesis].
Arkh Anat Gistol Embriol
March 1975
The development of the fields of the frontal zone (8, 3, 10, 11, 12) were compared in the pre- and postnatal periods oflife in the nacaque-rhesus and man. The cyto-mielcarchitectonical and guantitative methods wereused. The square surfaces of the above fields were measured, their per cent ratios to thesquare surface of all the cortex, new cortex and frontal zone were calculated.
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