doi: 10.1080/00032718608064492pmid: N/A
Abstract This is a scanned image of the original Editorial Board page(s) for this issue.
De Paula, Mauro H.; Aegerter, Michel A.
doi: 10.1080/00032718608064493pmid: N/A
Abstract Photothermal deflection spectroscopy (PDS) is applied for the absolute determination at room temperature of ultra trace concentration of cobalt and copper ions in aqueous solution. The samples have been prepared by percolating 2 liters of solution prepared from Merck Titrisol Standards in 200 mg Merck-I cationic exchange resin. With the present experimental conditions the detection limit is 20 ppb and 200 ppb for copper and cobalt ions respectively within an overall accuracy of 5%. The response of the spectrometer has been calibrated using ICP technique.
Cabon, J. Y.; Bihan, A. Le; Courtot-coupez, J.
doi: 10.1080/00032718608064494pmid: N/A
Abstract L'addition de très faibles concentrations de platine(IV) à des solutions de différents éléments métalliques (Na, Mn, Fe, Co, Ni, Cu, Zn, Ag, Cd, Pb) modifie l'atomisation de ces éléments en spectrophotométrie d'absorption atomique sans flamme. Deux effets sont observés : une évolution de la forme des massifs d'absorption associée à des variations de sensibilité et un accroissement des températures d'atomisation des métaux.
Al-hajjaji, M. A.; Al-zamil, I. Z.; Aziz Alrahman, A. M.; Sultan, S.; Al-tamrah, S. A.
doi: 10.1080/00032718608064495pmid: N/A
Abstract A spectrofluorimetric procedure for the determination of micromolar concentrations of antimony(III) was devised based on its reduction of cerium(IV) to produce fluorescent cerium(III). The method was optimized and the reaction was fast enough in hydrochloric acid media without the need for iodide or osmium(VIII) as catalysts. Linear calibration graphs were obtained in the range 1-10 10−6M. The standard deviation for determining 5 × 10−6M antimony(III)(10 times) was 1.43 × 10−7M and the relative error was -3.4 %. The method was applied to the determination of antimony(III) in its mixture with antimony(V), total antimony was later determined after reduction with mercury metal in deoxygenated solutions. The affect several reducing agents on the determination of antimony-was also examined.
doi: 10.1080/00032718608064496pmid: N/A
Abstract Antimony is reduced to stibine by sodium tetrahydroborate solution, passed through a heated silica tube and measured by atomic absorption spectrometry at 217.6 nm. Antimony is preconcentrated from water samples by lanthanum hydroxide precipitation. The detection limit is .0018 μg/ml and the rsd is 3.6% at the 0.050 μg/ml level. Interferences are discussed and the biological sample decomposition procedure evaluated. Typical results obtained for macroalgae, molluscs and fish in coastal waters are given.
Ménard, H.; Lalancette, J. M.; Lefebvre, Y.; Bélanger, D.
doi: 10.1080/00032718608064497pmid: N/A
Abstract The polycyclic aromatic hydrocarbons (PAH) represent a major source of pollution. The adsorption properties of chrysotile give us a good application as an asbestos filter and the regeneration can be made by ozonolysis for a complete destruction to non toxic compounds.
Johnson, Joseph H.; Erickson, Eric D.; Smith, S. Ruven
doi: 10.1080/00032718608064498pmid: N/A
Abstract Artifact peaks have been observed when samples of the detonation products of a number of U.S. Navy explosives were collected on Tenax-GC, desorbed with pentane, and analyzed by gas chromatography/mass spectrometry (GC/MS). We have shown that the formation of these spurious peaks takes place slowly when Tenax-GC is stored in the dark, but the formation is greatly accelerated when air flows over this polymeric absorbent.
Quentel, F.; Madec, C.; Bihan, A. Le; Courtot-coupez, J.
doi: 10.1080/00032718608064499pmid: N/A
Abstract Une nouvelle méthode pour déterminer la concentration en substances humiques (SH) du milieu marin est décrite. Elle est fondée sur l'exploitation de la composante faradaique du signal électrochimique obtenu en polarographie impulsionnelle après adsorption de ces espèces sur une goutte de mercure. L'influence de l'origine des SH sur la réponse électrochimique a été étudiée. La limite de détection est de 5μg C −1 pour une durée de dépôt de 3 min. Une application de la technique au suivi d'un profil vertical en milieu océanique est présentée.
doi: 10.1080/00032718608064500pmid: N/A
Abstract The polarographic behaviour of Cu(II) has been investigated in the presence of increasing concentration of 3-(2′-Thiazolylazo)-2,6-Diaminopyridine (2,6-TADAP) at different pH values and in 50% ethanol. At all pH's the waves were found to be diffusion controlled and irreversible. The values of the kinetic parameters na, Ko and * have been evaluated as a function of the ligand concentration. The maximum half-wave potential shifts were observed for the Cu(II) complex at pH 3.37. The polarographic wave height was proportional to the concentration of Cu(II). The method has also been applied to the determination of Cu(II) in aluminium alloys.
doi: 10.1080/00032718608064501pmid: N/A
Abstract A bacterial electrode for sulfate was developed by coupling a strain of the bacterium Desulfovibrio desulfuricans with a sulfide selective electrode. This bacterium reduces sulfate to sulfide by a complex multistep enzymatic reaction sequence. The response of this sensor to sulfate is Nernstian in the concentration range of 4 × 10−5 to 7 × 10−4 M. The electrode functions for a period up to 10 days when stored in growth medium under a nitrogen atmosphere. However, it is necessary to keep the sensor in an oxygen-free environment at all times, because oxygen irreversibly inhibits the required enzymes. Although this limits the practical utility of this sensor, alternative configurations for a more practical analytical system are proposed.
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