Room-temperature phosphorimetry of pesticides using a luminescence sampling system

Abstract

A versatile luminescence sampling system is described and used in the study of the room-temperature phosphorescence of certain pesticides. The limits of detection, linear dynamic range and heavy-atom enhancement factors are given for six phosphorescent pesticides as well as their rise, plateau and fall times. The effects of various heavy atoms and filter-paper substrates on both room-temperature phosphorescence signal inducement and blank background interference are also reported. Several synthetic mixtures of phosphorescent pesticides are analysed without separation using different degrees of room-temperature phosphorescence enhancement of these pesticides by various substrates and heavy atoms.

Determination of the Pesticide Napropamide in Soil, Pepper, and Tomato by Micelle-Stabilized Room-Temperature Phosphorescence

“…One of the methodologies employed is based on measuring the phosphorescence intensity emitted by the phosphor while fixed on an inert solid support such as filter paper (5)(6)(7)(8), but this technique has the disadvantages of cumbersome sample preparation, critical drying requirements, and high phosphorescent background intensity from the filter paper substrate.…”

Cyclodextrin-Based Optosensor for the Determination of Warfarin in Waters

“…It causes hypoprothrombinemia and vascular injury resulting in haemorrhage as the last cause of death (Proctor, 1988). Owing to their extensive use as anticoagulant in cardiovascular therapy several procedures have been reported for its determination, both in pharmaceutical and biological samples, including HPLC (Montgomery et al, 1996;Andersen et al, 1993), capillary electrophoresis (Yang and Hage, 1994;Gareil et al, 1993), spectrophotometric (Sastry et al, 1991), fluorimetric (Panadero et al, 1993), and room-temperature phosphorimetry techniques (Yang Su et al, 1984;Vanelly and Shulman, 1984;Garcı ´a Sa ´nchez and Cruces Blanco, 1989). Humans impose warfarin on the environment through agricultural activities and only a few reports exist on its determination in environmental samples (Tang and Rowell, 1998;Ma ´rquez et al, 1990;Vichez Quero et al, 1996).…”

Application of partial least squares multivariate calibration for the determination of mixtures of carbaryl and thiabendazole in waters by transmitted solid phase spectrophosphorimetry

“…Room temperature phosphorimetry is a technique that allows the development of analytical methods that combine these qualities because, together with the natural sensitivity and selectivity of luminescent methods, it can reduce costs through the use of inexpensive materials and reagents, and provides short analysis times. The methodology employed in room temperature phosphorescence (RTP) is based on the measurement of the phosphorescence intensity in a solid phase, [1][2][3][4][5] or in solution if the analyte forms an inclusion complex (cyclodextrins), 6,7 or micellar-stabilised media with non-polar molecules containing a polar group. [8][9][10] Obviously, the use of paper as a solid support diminishes the cost of the analysis, but it has the disadvantage of showing a background signal produced by the substrate, which can limit its application in the detection of trace analytes.…”