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1.
Fresenius J Anal Chem ; 367(1): 93-5, 2000 May.
Article in English | MEDLINE | ID: mdl-11227444

ABSTRACT

A method for quantitative evaluation of pentachlorophenol (PCP) in sawdust has been developed. Pentachlorophenol is extracted from the solid matrix with 0.5 M sodium hydroxide and preconcentration was carried out using quinolin-8-ol immobilized on controlled pore glass. Determination was carried out by using liquid chromatography with detection at 240 nm. Recoveries were between 84 and 97% at 1-3 microg/g.


Subject(s)
Chromatography, High Pressure Liquid/methods , Environmental Pollutants/analysis , Oxyquinoline/metabolism , Pentachlorophenol/analysis , Wood , Adsorption , Glass , Reference Standards , Sensitivity and Specificity
2.
J Chromatogr A ; 839(1-2): 227-32, 1999 Apr 16.
Article in English | MEDLINE | ID: mdl-10327627

ABSTRACT

The efficiency of an adsorbent consisting of quinolin-8-ol immobilized on controlled-pore glass which was packed in a minicolumn to preconcentrate nitrophenols in the presence of iron(III) has been established. Retention was carried out at acidic pH in the presence of 20 mM iron(III). Methanol-30 mM formic acid-sodium formate aqueous solution (pH 4.2) (65:35) was used in a one-step elution. Determinations were carried out by using liquid chromatography with detection at 350 nm. Determination of trace amounts of dinoseb in lemon juice was carried out with a minimum sample preparation. Recoveries were between 89 and 100% at 200-33 micrograms l-1. The maximum admissible concentration in fruit juice dictated by the Spanish and European Community legislation can be measured.


Subject(s)
2,4-Dinitrophenol/analogs & derivatives , Chromatography, High Pressure Liquid/methods , Citrus/chemistry , Hydroxyquinolines , Iron , Pesticides/analysis , 2,4-Dinitrophenol/analysis , Adsorption , Glass , Microchemistry , Quality Control , Solutions
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