The Experts below are selected from a list of 1290 Experts worldwide ranked by ideXlab platform
M Luque D De Castro - One of the best experts on this subject based on the ideXlab platform.
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determination of formaldehyde in liquid solid and semisolid pharmaceuticals and cosmetics by flow injection pervaporation
Analyst, 1999Co-Authors: Laura Gamizgracia, M Luque D De CastroAbstract:A spectrophotometric method is proposed for the determination of formaldehyde in liquid, solid and semisolid cosmetic and pharmaceutical samples, employing, for the first time in this field, the coupling of a continuous flow configuration to a pervaporation unit. The method is based on the reaction of the analyte with Pararosaniline in acidic medium and subsequent formation of a coloured product (alkylsulfonic acid chromophore) with sodium sulfite, which was monitored spectrophotometrically. The method was applied to samples in which the formaldehyde content is regulated by law.
Laura Gamizgracia - One of the best experts on this subject based on the ideXlab platform.
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determination of formaldehyde in liquid solid and semisolid pharmaceuticals and cosmetics by flow injection pervaporation
Analyst, 1999Co-Authors: Laura Gamizgracia, M Luque D De CastroAbstract:A spectrophotometric method is proposed for the determination of formaldehyde in liquid, solid and semisolid cosmetic and pharmaceutical samples, employing, for the first time in this field, the coupling of a continuous flow configuration to a pervaporation unit. The method is based on the reaction of the analyte with Pararosaniline in acidic medium and subsequent formation of a coloured product (alkylsulfonic acid chromophore) with sodium sulfite, which was monitored spectrophotometrically. The method was applied to samples in which the formaldehyde content is regulated by law.
Dick,luis F. P. - One of the best experts on this subject based on the ideXlab platform.
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Development of a coulometric method for the determination of gaseous sulfur compounds in urban atmospheres
Sociedade Brasileira de Química, 2000Co-Authors: Dick,luis F. P.Abstract:A new procedure for the determination of atmospheric sulfur compounds was developed and applied during three months in the central area of the City of Porto Alegre- RS, and one month near an oil refinery located close to this city. The method is based on the coulometric determination of the tarnishing rate of pure silver. The results were compared with the method of Pararosaniline, which is being currently used in some of the studied sites for the determination of SO2. The results obtained showed a good correlation between the coulometric method and the Pararosaniline method, when only SO2 is present, as usually is the case of urban atmospheres. When H2S is also present, as in the case of industrial areas, the methodology tends to strongly overestimate SO2 concentration
Dick, Luis Frederico Pinheiro - One of the best experts on this subject based on the ideXlab platform.
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Development of a coulometric method for the determination of gaseous sulfur compounds in urban atmospheres
2000Co-Authors: Magali Da ,silva, Dick, Luis Frederico PinheiroAbstract:Uma nova metodologia para a determinação de compostos gasosos de enxofre presentes em atmosferas urbanas foi desenvolvida e aplicada durante três meses na região central da cidade de Porto Alegre- RS e em uma refinaria de petróleo, localizada próxima à essa cidade. O método se baseia na determinação coulométrica da taxa de sulfetação da prata pura. Os resultados foram comparados com o método da pararosanilina, que está sendo atualmente utilizado para a determinação de SO2 em alguns dos locais aqui estudados. Os resultados obtidos mostraram que uma boa correlação entre o método coulométrico e o método da pararosanilina é observada quando somente SO2 está presente, como normalmente é esperado para atmosferas urbanas. Quando H2S está também presente, como no caso das áreas industriais, a nova metodologia tende fortemente a super estimar derivados gasosos de enxofre.A new procedure for the determination of atmospheric sulfur compounds was developed and applied during three months in the central area of the City of Porto Alegre- RS, and one month near an oil refinery located close to this city. The method is based on the coulometric determination of the tarnishing rate of pure silver. The results were compared with the method of Pararosaniline, which is being currently used in some of the studied sites for the determination of SO2. The results obtained showed a good correlation between the coulometric method and the Pararosaniline method, when only SO2 is present, as usually is the case of urban atmospheres. When H2S is also present, as in the case of industrial areas, the methodology tends to strongly overestimate SO2 concentration
Li Shun - One of the best experts on this subject based on the ideXlab platform.
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Study of Sulphur Dioxide Residue in Different Drynesses of Lili Bulbus
Journal of Traditional Chinese Medicine University of Hunan, 2012Co-Authors: Li ShunAbstract:Objective Determining the content of sulphur dioxide residue in different drynesses of Lili bulbus,It provides experiment reference about medication safety of Lili bulbus.Methods Using Pararosaniline hydrochloride method and Sodium bisulfite as index to determine remainder of sulphur dioxide in Lili bulbus.Results The remainders of sulphur dioxide in sulfurring and using coal as fuel drying Lili bulbus were exceeded.Conclusion The experiment could provide a reference to the safety assessment of Lili bulbus.
