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Dimethyl Phthalate (dimethyl + phthalate)

Distribution by Scientific Domains

Medical Sciences	50%

Selected Abstracts

Application of heterogeneous adsorbents in removal of dimethyl phthalate: Equilibrium and heat

AICHE JOURNAL, Issue 10 2010
Jun Wu
Abstract Aminated resin (NDA-101) and oxidized resin (NDA-702) were synthesized to remove Dimethyl phthalate (DMP) from the contaminated water. The equilibrium and heat properties in the course of adsorption process were examined and compared with two commercial heterogeneous adsorbents, namely an acrylic ester resin (Amberlite XAD-7) and a coal-based granular activated carbon (AC-750). The associated equilibrium isotherms can be well fitted by Freundlich equation and the adsorption capacities for DMP followed the order: NDA-702 > NDA-101 > AC-750 > XAD-7. The surface of XAD-7 was demonstrated to be relatively homogeneous through surface energy heterogeneity analysis, offering the sole hydrogen bonding interaction. Contrarily, heterogeneous surface of oxidized resins NDA-702 and the aminated resins NDA-101 exhibited a promising adsorption capacity and affinity toward DMP probably derived by multiple hydrogen bonding, ,,, stacking, and micropore filling interactions. © 2010 American Institute of Chemical Engineers AIChE J, 2010 [source]

Human exposure to phthalates via consumer products

INTERNATIONAL JOURNAL OF ANDROLOGY, Issue 1 2006
TED SCHETTLER
Summary Phthalate exposures in the general population and in subpopulations are ubiquitous and widely variable. Many consumer products contain specific members of this family of chemicals, including building materials, household furnishings, clothing, cosmetics, pharmaceuticals, nutritional supplements, medical devices, dentures, children's toys, glow sticks, modelling clay, food packaging, automobiles, lubricants, waxes, cleaning materials and insecticides. Consumer products containing phthalates can result in human exposures through direct contact and use, indirectly through leaching into other products, or general environmental contamination. Historically, the diet has been considered the major source of phthalate exposure in the general population, but all sources, pathways, and their relative contributions to human exposures are not well understood. Medical devices containing di-(2-ethylhexyl) phthalate are a source of significant exposure in a susceptible subpopulation of individuals. Cosmetics, personal care products, pharmaceuticals, nutritional supplements, herbal remedies and insecticides, may result in significant but poorly quantified human exposures to dibutyl phthalate, diethyl phthalate, or dimethyl phthalate. Oven baking of polymer clays may cause short-term, high-level inhalation exposures to higher molecular weight phthalates. [source]

Determination of phthalate esters in cosmetics by gas chromatography with flame ionization detection and mass spectrometric detection

INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Issue 4 2005
Huiming Chen
GC-FID; GC-MS; Produits cosmétiques; Esters Phtaliques Synopsis A gas chromatography coupled with flame ionization detection (GC-FID) and mass spectrometric detection (MSD) method was developed to determine the six kinds of phthalate esters [dimethyl phthalate (DMP), diethyl phthalate (DEP), di- n -butyl phthalate (DBP), benzyl butyl phthalate (BBP), di(2-ethylhexyl) phthalate (DEHP) and di- n -octyl phthalate (DOP)] in cosmetics (solid, cream and liquid cosmetics). The cosmetics were extracted with methanol by ultrasonic and then separated with high-speed centrifugation. The upper clear layer was dried and filtered through a 0.45 ,m pore diameter filter. The filtrate was injected into GC-FID/GC-MS for detection. GC-FID chromatogram was applied for qualitative analysis, external standard method was used for quantitative analysis. Confirmation of phthalate presence was undertaken by GC-EI-MS. The recovery range of all phthalates were between 92.0 and 110.0% with relative standard deviations between 1.95 and 5.92%. The low detection limits of the method were: 0.1 ng for DMP, DEP, DBP and BBP, 0.5 ng for DEHP and DOP. The method had advantages of high precision and sensitivity, simplicity of pretreatment. The method can be used to test the six kinds of phthalate esters in cosmetics. Resume Une méthode d'analyse par chromatographie gazeuse couplée à une détection par ionization de flamme (GC - FID) et une détection spectrométrique de masse (MSD) a été développée pour analyser 6 sortes d'esters phtaliques (phtalate de diméthyle (DMP), phtalate de diéthyle (DEP), phtalate de di- n -butyle (DBP), phtalate de benzylbutyle (BBP), phtalate de di-2-éthylhexyle (DEHP) et phtalate de di- n -octyle (DOP)) dans des produits cosmétiques (solides, crèmes et liquides). Les produits cosmétiques sont extraits au méthanol sous ultrason, puis séparés par ultracentrifugation. La phase supérieure limpide est déshydratée et filtrée sur un filtre de diamètre de pore moyen égal à 0,45 ,m. Le filtrat est injecté dans le système GC - FID/GC-MS pour analyse. Les chromatogrammes GC-FID sont utilisés pour l'analyse qualitative, des standards externes ont été utilisés pour l'analyse quantitative. La GC-EI-MS permet de confirmer la présence des esters phtaliques. Le taux de récupération de tous les esters est compris entre 92 et 110% avec une déviation standard allant de 1,95%à 5,92%. La limite de détection par cette méthode est de 0,1 ng pour DMP, DEP, DBP et BBP, 0,5 ng pour DEHP et DOP. Les avantages de cette méthode sont sa haute précision, sa sensibilité et la simplicité du prétraitement. Cette méthode peut être utilisée pour doser la présence des six sortes d'esters phtaliques dans des produits cosmétiques. [source]