Preconcentration and LC analysis of chlorophenols, using a styrene-divinyl-benzene copolymeric sorbent and photochemical reaction detection

-Various luminescence techniques based on the use of intermolecular energy transfer phenomena for detection in liquid streams are discussed. The two distinct methods based on room temperature phosphorescence in liquid phases (RTPL), the sensitized and quenched RTPL, are described. In particular the potential of phosphorescence quenching is wide. It will be demonstrated that this method has considerable promise for the determination of organic compounds, but also as a detector for selected inorganic ions, e.g., N02, S032, Pt2+ in ion chromatography. Furtheron attention is paid to photochemically generated or photosensitized reactions. It is shown that photocheraical reactions can be used as a special type of post-column derivatization, and improvements in both sensitivity and selectivity have been demonstrated. The mechanisms for photoreduction of anthraquinone by isopropanol and for the sensitized photo-oxygenation of ethanol are discussed.

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“…28). The inherent selectivity of this detection mode was again positive when analyzing phenoles or anilines in polluted water sources.…”

Section: Photosensitized Luminescencementioning

confidence: 86%

Detection in liquid chromatography based on different luminescence principles

Frei¹,

Velthorst²,

Gooijer³

1985

Pure and Applied Chemistry

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“…Postcolumn photochemical reactions that detect photolysis products by modes other than conductivity have been reported. WerkhovenGoewie et al (50) determined chlorophenols by photolytic dehalogenation to fluorescent products. Chlorophenols in river water were on-line preconcentrated on PRP-1, a styrene-divinylbenzene copolymeric sorbent packed precolumn.…”

Section: Hplc Determination Of Trace Organic Compounds 127mentioning

confidence: 99%

High-Performance Liquid Chromatography for Determination of Trace Organic Compounds in Aqueous Environmental Samples

Graham

1986

Advances in Chemistry

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A review of high-performance liquid chromatographic (HPLC) instrumentation, techniques, and methodologies for the deter mination of trace organic compounds in water is presented. The review includes approaches to sample cleanup or analyte isola tion for those compounds likely to be candidates for analysis by HPLC. Column technology, as it contributes to the use of HPLC for trace organic analyses, is discussed. Finally, various tech niques for quantitative and qualitative detection of analytes are discussed. "W • Τ HAT IS IN THIS WATER?"This seemingly simple, yet horrendously complex question is being posed by increasing numbers of well-in formed and not so well-informed individuals. In the recent U.S. Envi ronmental Protection Agency (USEPA) report, "National Water Quality Inventory Report to Congress", two issues of national concern were identified: (1) pollution resulting from toxic substances and (2) con tamination and depletion of ground water. More than half the states reported ground water problems stemming from waste disposal, landfill seepage, and excessive depletion of ground water supplies. A diverse collection of highly skilled scientists and engineers will be needed to effectively address these ubiquitous problems and to provide meaning ful answers to the question "What is in this water?"As more people ask this question, a greater burden will fall on the

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“…Generally, PIF methods are considered as efficient fluorophore-generating systems for stationary media [9][10] as well as for flowing devices such as HPLC post-column photoreaction [11][12][13][14] or FIA [15][16][17][18]. Among the various parameters controlling the analyte conversion photoreaction and method sensitivity two are particularly important namely, the optimum UV irradiation time (time of irradiation optimum, corresponding to the maximum PIF signal) and the type of solvent [19].…”

Section: Introductionmentioning

confidence: 99%