Room Temperature Phosphorimetry as a New Spectrochemical Method of Analysis

Dinh, T. Vo; Winefordner, J. D.

doi:10.1080/05704927708060386

Cited by 45 publications

(17 citation statements)

References 68 publications

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“…However, the main criterion has been the consideration of relative RTL of analyte compared with background signal of solid substrate. The primary interactions between the analyte species and the solid materials mentioned above can be summarized as follows [22][23][24][25][26]; in sodium acetate, the chief mechanisms are either the formation of sodium salt of the organic compound or hydrogen bonding between sodium acetate and the electron releasing group of the analyte organic molecule. Cyclodextrins, another large class of materials used in RTL works, have the ability of forming inclusion complexes with a large number of organic and inorganic compounds.…”

Section: Origin Of Fluorescence Signal On the Surfacementioning

confidence: 99%

“…Surfactants dissolve in many solutions when they are in very small amounts; but when their concentration exceeds a typical minimum value called 'critical micelle concentration', they form aggregates or clusters in a very organized environment. The physicochemical interactions in micellar systems can be found elsewhere [22][23][24][25]. After some trial-and-error experiments, the above-mentioned surfactant solutions were prepared in the concentrations given in Table 1.…”

Section: No6el Substrates For the Determination Of H 2 S By Rt-sslmentioning

confidence: 99%

“…Since the molecules are isolated and collision-restricted, this technique enables very sensitive determinations for many organic and inorganic substances at room temperature without necessitating cryogenic conditions. [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Fiber optic sensors using novel substrates for hydrogen sulfide determination by solid surface fluorescence

Eroglu¹

2000

Talanta

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Two different fiber optic sensors were developed for the determination of hydrogen sulfide at ppb concentration levels; a probe-type fiber optic sensor coated with polyethylene oxide containing 0.5 M CdCl 2 and a fiber optic sensor utilizing 0.5 M CdCl 2 -pretreated filter paper as solid substrate. In the first type, CdCl 2 -polyethyleneoxide (PEO) mixture was coated onto the tip of a fiber optic probe and the probe was exposed to H 2 S. The methodology is based on the measurement of CdS fluorescence on the surface. Detection limit (3s) of the PEO-coated fiber optic system was 36.0 ppb for H 2 S and precision at the 0.552 ppm level was 29% R.S.D. For the fiber optic system utilizing CdCl 2 -pretreated filter paper, two different configurations were devised and evaluated; a bifurcated fiber optic sensor and a single fiber optic sensor. Similar figures were obtained with these two systems; the detection limit (3s) was 4.0 ppb for the bifurcated fiber optic sensor and 4.3 ppb for the single fiber optic sensor, and both sensors had linear responses in the range 0.032-1.0 ppm. Their precisions at 0.299 ppm level were also very similar, 10 and 11% R.S.D., respectively, for the bifurcated and single fiber systems. In addition to the fiber optic sensors developed, various surfactants (sodiumdodecylsulfate (SDS), Aerosol OT, Aerosol A102, Aerosol 501), some cellulosic substances (sodium carboxymethylcellulose (CMC), ethylcellulose, hydroxypropylmethylcellulose, ethylhydroxyethylcellulose, a-cellulose) and several water-soluble polymers (polyacrylicacid polyethleneoxide (PEO), polyvinylalcohol (PVA)) were dissolved in proper solvents and after mixing with 0.5 M CdCl 2 , were spread over glass slides. These novel solid substrates were exposed to H 2 S and fluorescence signal on the surfaces of the glass slides was measured with a luminescence spectrometer. The new substrates were shown to be good alternatives to filter paper for the determination of H 2 S by room temperature solid surface fluorescence spectrometry.

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Section: Origin Of Fluorescence Signal On the Surfacementioning

confidence: 99%

Section: No6el Substrates For the Determination Of H 2 S By Rt-sslmentioning

confidence: 99%

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Fiber optic sensors using novel substrates for hydrogen sulfide determination by solid surface fluorescence

Eroglu¹

2000

Talanta

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“…Originally observed from compounds adsorbed onto solids (2,3), the RTP phenomenon has been further developed for chemical analysis of organic species in solid substrates (4)(5)(6)(7) as well as liquid media (8,9). In particular, it has been successfully applied to the detection of polyaromatic hydrocarbons (PAHs) and N-heterocycles in environmental samples (10)(11)(12)(13).…”

mentioning

confidence: 99%

External heavy-atom effect in room-temperature phosphorescence

Suter¹,

Kallir²,

Wild³

et al. 1987

Anal. Chem.

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The effect of external heavy-atom perturbers on the roomtemperature phosphorescence (RTP) spectrum of dibenzo-[f,h]quinoxaline (DBO) adsorbed on Whatman 4 fllter paper is reported. The totally symmetric vibrational bands are predominantly enhanced, leading to a spectral change in vibratbnal structure. Inhomogeneity effects of moiecule-perturber interactions are investlgated by time-resolved phosphorimetry and lifetime measurements.Room-temperature phosphorescence (RTP) is a sensitive and simple analytical method to characterize molecules adsorbed on solid substrates (I). Originally observed from compounds adsorbed onto solids (2,3), the RTP phenomenon has been further developed for chemical analysis of organic species in solid substrates (4-7) as well as liquid media (8,9). In particular, it has been successfully applied to the detection of polyaromatic hydrocarbons (PAHs) and N-heterocycles in environmental samples (10-13). Filter paper is the most widely used substrate for RTP, since it is inexpensive and commercially available. The corresponding sample preparation is also simple and rapid: only 2-5 yl of the sample solution is required for a typical assay. The solution is spotted on the paper, and after thorough drying in a stream of hot air or under an IR lamp, the sample is ready for measurement in a spectrometer equipped with a standard phosphoroscope ( I ) .In previous works, we have investigated photophysical aspects related to the interactions of molecules with the substrate: the guest-host interaction (electron-phonon coupling) on a filter paper substrate was studied by measuring laserinduced phosphorescence line narrowing (14). Hydrogenbonding interactions were investigated by using two-dimensional total luminescence spectroscopy (15). In this work we investigate the external heavy-atom effect in R T P and study experimental factors that could affect analytical applications.The sensitivity of R T P may be drastically increased by the external heavy-atom effect (16)(17)(18)(19) and limits of detection in the picogram range have been achieved. The filter paper may be impregnated with a heavy-atom solution prior to spotting the analyte solution or the two solutions may be spotted simultaneously. The heavy-atom enhancement factors depend not only on the concentration but also on the particular properties of the heavy atoms used: high enhancement factors have been found with T1+ and Pb2+ for PAHs and with I-and Hg2+ for N-heterocycles (13). Apart from the overal phosphorescence intensity enhancement, other effects such as spectral shifts and changes in the spectral intensity profiles, due to external heavy-atom perturbers, should also be considered in the interpretation of R T P spectra. Short and long RTP decaying components of several indoles on ion-exchange paper substrates have been previously reported (20). In a recent work (13) it was demonstrated, that R T P spectra of N-heterocycles are red-shifted-compared to the spectrum obtained with no heavy-atom perturbers-when using HgCl, as the heavy atom sal...

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“…Since its discovery in 1967 by Roth, 10 room temperature phosphorimetry (RTP) has attracted great interest and has become a practical technique for the detection of many organic compounds. [10][11][12][13][14][15][16][17][18] As the sample must be adsorbed on an inert substrate such as filter-paper, 19,20 the technique has the disadvantages of cumbersome sample preparation, critical drying requirements and high phosphorescent background intensity from the filter-paper substrate.…”

mentioning

confidence: 99%

Phosphorimetric Determination of Dipyridamole in Pharmaceutical Preparations

Pulgarı́n

Molina²,

López³

1997

Analyst

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Room temperature phosphorescence was applied to the determination of dipyridamole in pharmaceutical preparations. The response was linear in the concentration range 100-1600 ng ml-1. The use of phosphorescence enhancers such as thallium(I) nitrate (external heavy atom), sodium dodecyl sulfate (microemulsion stabilizer) and sodium sulfite (deoxygenation agent) was studied and optimized to obtain maximum sensitivity and adequate selectivity. The determination was performed in 0.026 M sodium dodecyl sulfate, 0.0156 M thallium nitrate and 0.02 M sodium sulfite. The pH value was 11.5, adjusted by adding sodium hydroxide. The phosphorescence was totally developed in 15 min, after that the intensity was measured at lambda ex = 303 nm and lambda em = 616 nm. The recovery of the method was tested on commercial formulations containing dipyridamole. The recoveries obtained were 94.67 +/- 0.58% for Persantin and 96.75 +/- 1.37% for Asasantin. The overall least squares regression method was applied to find the most exact straight line that fits the experimental data. The detection limit according to the error propagation theory was 16.4 ng ml-1. The repeatability and relative standard deviation were also determined according to this theory.

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Room Temperature Phosphorimetry as a New Spectrochemical Method of Analysis

Cited by 45 publications

References 68 publications

Fiber optic sensors using novel substrates for hydrogen sulfide determination by solid surface fluorescence

Fiber optic sensors using novel substrates for hydrogen sulfide determination by solid surface fluorescence

External heavy-atom effect in room-temperature phosphorescence

Phosphorimetric Determination of Dipyridamole in Pharmaceutical Preparations

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