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%. After microextraction, one edge of the membrane was cut, and 1 μL of solvent was collected from the membrane using a 10 μL syringe. The solvent sample was directly injected into the gas chromatograph. The analytical characteristics of the developed method were as follows: detection limits, 0.017-0.037 ng mL-1; linear working range, 10-900 ng mL-1; recovery, 74 ± 9-91 ± 2; relative standard deviation, 5.7-10.3; and enrichment factor, 330-455. A simple, fast, economic, selective, and efficient method with big possibilities for automation was developed with a potential use to apply with other matrices and analytes.
Universidad de Caldas, Facultad de Ciencias Exactas y Naturales, Depto. Química, Manizales-Colombia.
Liliana
L
Correa
Universidad de Caldas, Facultad de Ciencias Exactas y Naturales, Depto. Química, Manizales-Colombia.
Jhon Alex
JA
Fiscal
Dirección Territorial de Salud de Caldas DTSC, Laboratorio de Salud Pública, Área de Análisis Instrumental, Hospital Santa Sofía Edificio Urgencias tercer piso, Manizales-Colombia.
Sandra
S
Ceballos
Dirección Territorial de Salud de Caldas DTSC, Laboratorio de Salud Pública, Área de Análisis Instrumental, Hospital Santa Sofía Edificio Urgencias tercer piso, Manizales-Colombia.
Alberto
A
de la Ossa
Universidad de Caldas, Facultad de Ciencias Exactas y Naturales, Depto. Química, Manizales-Colombia.
Gonzalo
G
Taborda
Universidad de Zaragoza, EINA Departamento de Química Analítica Campus Rio Ebro, Zaragoza-España.
Cristina
C
Nerin
Universidad de Caldas, Facultad de Ciencias Exactas y Naturales, Depto. Química, Manizales-Colombia.
Milton
M
Rosero-Moreano
Drinking water; Emerging contaminants; Hollow-fiber solvent bar microextraction; Liquid-phase microextraction; Trihalomethanes