Showing papers by "Purnendu K. Dasgupta published in 1984"
TL;DR: The longueur de parcours effective d'une cellule a trajet multiple varie avec l'absorbance de la solution and est plus grande pour les solutions de faible absorbance.
Abstract: La longueur de parcours effective d'une cellule a trajet multiple varie avec l'absorbance de la solution et est plus grande pour les solutions de faible absorbance
52 citations
TL;DR: In this article, a diffusion denuder with a thin membrane tube as the collecting element and with a scrubber solution flowing in a narrow annular gap outside the membrane is described, with the advantages of the diffusion scrubber as a highly efficient concentrator of soluble atmospheric gases and as an integral part of a microflow continuous flow analysis system.
52 citations
44 citations
TL;DR: In this paper, le transfert de matiere lors d'ecoulements lineaire ou helicoidal traverses des echangeurs de cation a base de membrane Nafion.
Abstract: Donnees sur l'efficacite du transfert de matiere lors d'ecoulements lineaire ou helicoidal a travers des echangeurs de cation a base de membrane Nafion. Cas ou les especes diffusantes sont K + et NEt 4 +
42 citations
TL;DR: Comportement chromatographique de 30 anions sur phase stationnaire de poly(styrene-divinylbenzene) en utilisant des hydroxydes de tetraethyl and tetrapropylammonium comme reactifs d'interaction ionique as discussed by the authors.
Abstract: Comportement chromatographique de 30 anions sur phase stationnaire de poly(styrene-divinylbenzene) en utilisant des hydroxydes de tetraethyl et tetrapropylammonium comme reactifs d'interaction ionique
30 citations
Patent•
12 Dec 1984
TL;DR: In this article, a permselective assembly for the selective transport of a species of interest across a semipermeable ion, exchange barrier and a method of operating the same are disclosed.
Abstract: A permselective assembly for the selective transport of a species of interest across a semipermeable ion, exchange barrier and a method of operating the same are disclosed. The assembly includes an inner tube of a permselective material disposed within the inner volume of an outer tube of a permselective material forming an annular channel therebetween. This annular dual tube arrangement decreased the hold up volume of the outer tube and increases efficiency of transport of the species of interest.
19 citations
TL;DR: In this article, 8-Amino-1-naphthol-5-sulfonic acid is proposed as a self-coupling diazotizing reagent for the determination of nitrite.
Abstract: 8-Amino-1-naphthol-5-sulfonic acid is proposed as a self-coupling diazotizing reagent for the determination of nitrite.
11 citations
TL;DR: In this paper, the authors used anthranillic acid as a fluorescent amine substrate to measure sulfur(IV) in formaldehyde stabilized samples in the 1-50 ppb range.
6 citations
TL;DR: The performance of a differential pressure transducer as a viscosity detector in conjunction with a pulseless high pressure syringe pump designed for the purpose is described in this article.
Abstract: The performance of a differential pressure transducer as a viscosity detector in conjunction with a pulseless high pressure syringe pump designed for the purpose is described. The detector, although relatively insensitive, is inexpensive and extremely rugged. Because it is non-destructive and introduces very little dispersion, serial coupling ahead of other detectors is possible. Response behavior is demonstrated.
5 citations
TL;DR: In this paper, a new indicator, 2-(8-hydroxy-3,6-disulfo-1-naphthylazo)-1,8-dihydroxynaphthalene-3-6disulfonic acid (Beryllon II, DSNADNS) is proposed for microtitrimetric determination of sulfate with barium.
Abstract: A new indicator, 2-(8-hydroxy-3,6-disulfo-1-naphthylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid (Beryllon II, DSNADNS) is proposed for microtitrimetric determination of sulfate with barium. This method is an order of magnitude more sensitive (LOD 0.25 ppm) and has less interference than the existing indicators. The color change is sharper and faster compared to Thorin. Titration is carried out in 80% 2-propanol at an apparent pH of 3.5. The superiority of the indicator is attributed to the lower solubility of the bariumdye salt. Results are presented for environmental samples and compared with values obtained by ion chromatography.
3 citations