A fiber-optic dipping sensor for organic solvents in wastewater

Dickert, Franz L.; Schreiner, Serge; Mages, G.; Kimmel, H.

doi:10.1021/ac00195a018

Cited by 38 publications

(13 citation statements)

References 36 publications

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“…From attenuated total reflection theory, it is known that the evanescentwave intensity E is described by an exponential decay functions: (2) where z is the distance normal to the optical interface and y is the attenuation coefficient given by…”

Section: Discussionmentioning

confidence: 99%

Infrared evanescent-absorption spectroscopy with chalcogenide glass fibers

et al. 1994

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We have used telluride glass fibers fabricated in house to measure the evanescent-absorption spectra of water, methanol, ethanol, isopropanol, acetone, ethanoic acid, hexane, and chloroform. Furthermore, detection limits of less than 2 vol. % solute were obtained for mixtures of water and methanol, ethanol, isopropanol, acetone, and ethanoic acid. Techniques to reduce the detection limits are discussed.

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Section: Discussionmentioning

confidence: 99%

Infrared evanescent-absorption spectroscopy with chalcogenide glass fibers

et al. 1994

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“…Another successful sensor based on NIR laser diodes for the determination of different ambient gases including humidity has been reported. (126) A hand-held fiber-optic system for the detection of organic solvents in water was introduced by Dickert et al (127) Here, a diphenyl phthalide dye was embedded behind a gas-permeable membrane, which extracts the organic solvents from the water. The dye shows hypochromic effects and therefore the change in absorbance can be used to quantify analyte concentration.…”

Section: Optical Sensorsmentioning

confidence: 99%

Solid‐state Sensors for Field Measurements of Gases and Vapors

Mujahid

Lieberzeit

Dickert

2000

Encyclopedia of Analytical Chemistry

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Remote and infield analysis is developing into a crucial aspect of modern analytical chemistry. Chemical sensors, which are small measuring devices consisting of a recognition layer, a transducer, and the measurement electronics, have proven to be highly suitable tools for this purpose. Although usually they are constructed for the detection of very limited amounts of chemical compounds and often do not reach the detection limits of modern analytical instruments, they show very desirable advantages: the systems are easy to operate, mostly rugged, small, of good value, and can be manufactured by established technological methods. Owing to their size and ruggedness, they can even be operated in harsh environments and often can be constructed to be suitable for remote measurements, where several sensors are interrogated by a central analytical site. Devices being used include optical fibers, field‐effect transistors (FETs), electrochemical cells (be they potentiometric or amperometric), and mass‐sensitive components of all kinds. The chemically sensitive coatings range from bare transducer surfaces to dyes reacting with analyte or sterically specific binding sites (e.g. host–guest complexes). A seeming drawback is the fact that only few sensors react specifically toward one defined component but normally show a sensitivity pattern toward chemically related substances. By using an array of several components followed by modern methods of data evaluation (such as neural networks), a group of analytes can be detected and characterized simultaneously. This article introduces device and recognition layer principles as well as covering field sensors published during the last one and a half decades based on all the different kinds of transducers and sensor layers. Some of the devices (such as the lambda probe) are already marketed, others are developed to a stage where field measurements have already been carried out, but which are not market‐ready.

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“…Detection limits _s low as a few parts per million were reported. The method was also applied to sense polar solvents dissolved in water (Dickert et al 1989). This sensing was achieved by covering the sensing membrane with a gas-permeable but water-impermeable membrane.…”

Section: Solvent Vaporsmentioning

confidence: 99%