[Determination of seven nitrobenzene compounds in water samples by single-drop microextraction with capillary gas chromatography].

A method suitable for the extraction of nitrobenzene, nitrotoluenes and nitrochlorobenzenes from water samples using single-drop microextraction with capillary gas chromatography is presented. Parameters, such as organic solvents, drop volume of organics, agitation, immerge depth of needle point, aqueous sample volume, exposure time and temperature were controlled and optimized. The developed protocol was found to yield a linear calibration curve in a concentration range from 0.

[Determination of trace phenol compounds using gas chromatography-mass spectrometry coupled with Tenax adsorption tube for enrichment of air samples].

A novel determination method for trace of seven phenol compounds in air samples has been established. They were collected with Tenax adsorption tube (180 mm x 60 mm glass tube packed with 150 mg Tenax (40 - 60 mesh)) and desorbed with methanol. Five microlitres of naphthalene-D8 (internal standard) solution was added to the eluate.