Hollow-fiber solvent bar microextraction with gas chromatography and electron capture detection determination of disinfection byproducts in water samples.

A liquid-phase microextraction method that uses a hollow-fiber solvent bar microextraction technique was developed by combining gas chromatography with electron capture detection for the analysis of four trihalomethanes (chloroform, dichlorobromomethane, chlorodibromomethane, and bromoform) in drinking water. In the microextraction process, 1-octanol was used as the solvent. The technique operates in a two-phase mode with a 5 min extraction time, a 700 rpm stirring speed, a 30°C extraction temperature, and NaCl concentration of 20%.

[Detection of polyps, adenomas, advanced adenomas and adenocarcinomas in patients between 45 and 49 years].

Unlabelled: BACKGROUND. Colorectal cancer (CRC) can be prevented. Colonoscopy is the first-line procedure for screening in average risk population.