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M D De Castro

Publications and source records attributed to M D De Castro.

4 recordsLinked to original sources
PubMed1996

Flow-through sensor based on derivative synchronous fluorescence spectrometry for the simultaneous determination of pyrene, benzo(e)pyrene and benzo(ghi)perylene in water.

A flow-through/first derivative synchronous spectrofluorimetric sensor for the determination of PAH has been described. This sensor has been used for the simultaneous determination of PAH mixtures (pyrene, benzo(e)pyrene and benzo(ghi)perylene). Linear calibration ranges between 10 and 500 ng/ml with acceptable precision (repeatability, expressed as relative standard deviation, smaller than 4.6%, and sampling frequency of 12 h(-1)) have been obtained. The method has been applied to the determination of the target analytes in spiked water samples with excellent results (recoveries between 94 and 108%).

Journal Article↗
PubMed1996

Flow-injection/pervaporation coupling for the determination of sulphide in Kraft liquors.

A dynamic manifold has been coupled with a pervaporation module for the determination of sulphide ion in complex matrices such as Kraft liquors. The method is based on ethylene blue formation and features detection limits of 0.68 and 0.42 microg mL(-1) of S(2-) for injection and continuous introduction of the sample, respectively, with linear ranges of 1-15 and 1-10 microg mL(-1). The method is highly selective as the interferences from other sulphur species are avoided in the pervaporation process; thus, it has been applied successfully to the determination of the analyte in white and green bleaching liquors.

Journal Article↗
PubMed1987

Enzymatic determination of ethanol in saliva by flow injection analysis.

Enzymatic photometric and fluorimetric methods are proposed for the determination of ethanol in saliva with determinative ranges of 2.5-15.0 mug ml(-1) and 1.0-20.0 mug ml(-1) respectively, i.e. covering the legal ranges after 1 : 100 dilution. A comparison between the ethanol content in saliva, breath and blood has been carried out on 12 individuals; the determination in saliva has been shown to be a good option.

Journal Article↗