Phthalates
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Thermal and mechanical properties of bio-based plasticizers mixtures on poly (vinyl chloride)
Abstract The use of mixtures of nontoxic and biodegradable plasticizers coming from natural resources is a good way to replace conventional phthalates plasticizers. In this study, two secondary plasticizers of epoxidized sunflower oil (ESO) and epoxidized sunflower oil methyl ester (ESOME) were synthesized and have been used with two commercially available b
Polímeros. Publicado em: 21/09/2017
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2. Determination of phthalates in polymer materials - comparison of GC/MS and GC/ECD methods
The paper presents two methods for determination of phthalates in polymer materials. The methods compared were gas chromatography combined with the mass spectrometry (GC/MS) and gas chromatography with electron capture detector (GC/ECD). The GC/ECD technique was chosen for this comparison, because the ECD detector was one of few capable of detecting phthalat
Polímeros. Publicado em: 2013
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3. Ex-situ bioremediation of Brazilian soil contaminated with plasticizers process wastes
The aim of this research was to evaluate the bioremediation of a soil contaminated with wastes from a plasticizers industry, located in São Paulo, Brazil. A 100-kg soil sample containing alcohols, adipates and phthalates was treated in an aerobic slurry-phase reactor using indigenous and acclimated microorganisms from the sludge of a wastewater treatment pl
Brazilian Journal of Chemical Engineering. Publicado em: 2012-03
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4. Estudo de metais e de substâncias tóxicas em brinquedos
The main goal of the present study is the analysis of toxic elements in plastic toys commercialized in Brazil. Metals like cadmium, lead, chromium, zinc, and aluminum, along with organic substances, such as phthalates, were identified in different toys by quantitative analytical techniques. Traces of thorium were detected in one of the studied samples. Altho
Química Nova. Publicado em: 2009
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5. Tratamento de efluentes da indústria de processamento de carnes utilizando flotação por ar dissolvido e processos de oxidação avançada
The use of wastewater treatment processes with high efficiency of organic matter removal is considered one of the most important steps to achieve lower pollution loads in meat processing industries. As a primary treatment, dissolved air flotation processes (DAF) using coagulation-flocculation are generally applied. Additionally, the utilization of high effic
Publicado em: 2009
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6. Bioremediation of a tropical soil contaminated with plasticizers process wastes. / Biorremediação de solo tropical contaminado com resíduos da produção de plastificantes.
Plasticizers are low volatility compounds that offer flexibility and processability to resins. The phthalates and adipates, used as plasticizers, have low water solubility e high partition octanol/water(Kow) and accumulate in soil and sediments. This compounds are considered teratogenics, carcinogenics and as endocrine disruptors. This study evaluated the bi
Publicado em: 2009
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7. Occurrence of endocrine disrupters and pharmaceuticals products in surface waters in the Atibaia river basin / Ocorrencia de interferentes endocrinos e produtos farmaceuticos nas aguas superficiais da bacia do rio Atibaia
Numerous organic compounds called endocrine disruptors have been found at low levels in surface waters. Several compounds such as hormones (17b-estradiol, 17a-ethinylestradiol, estrone, progesterone and levonorgestrel), phthalates (diethylphthalate and dibutylphthalate), surfactants (4-octylphenol and 4-nonylphenol), bisphenol A, among others are included in
Publicado em: 2007
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8. Dispositivos hifenados para microextração em fase solida / Hyphenated devices for solid phase microextraction
In this work systems for Dynamic Headspace sampling (DHS) combined to Solid Phase Microextraction (SPME) were develloped, and different SPME fibers were evaluated for applications in Fiber Introducton Mass Spectrometry (FIMS). In the DHS-SPME systems assembled, analytes from solid, liquid or viscous samples can be extracted. A continuous flow of stripping ga
Publicado em: 2005
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9. THE IMPORTANCE AND OCCURRENCE OF PHTHALATES IN POTABLE WATERS AND SAMPLES FROM THE GUANABARA BAY ECOSYSTEM / A IMPORTÂNCIA E OCORRÊNCIA DE FTALATOS EM ÁGUA POTÁVEL E NO ECOSSISTEMA DA BAÍA DE GUANABARA
Phthalates are the most used plasticizers in industrial products, worldwide distributed in environments. Their presence is often used to indicate a region industrialization degree. Although their reported toxicity is low, phthalates are indicated for possible endocrine disrupting effects, specially in male reproductive system. In Brazil, there are few studie
Publicado em: 2002
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10. Bacterial Decarboxylation of o-Phthalic Acids
The decarboxylation of phthalic acids was studied with Bacillus sp. strain FO, a marine mixed culture ON-7, and Pseudomonas testosteroni. The mixed culture ON-7, when grown anaerobically on phthalate but incubated aerobically with chloramphenicol, quantitatively converted phthalic acid to benzoic acid. Substituted phthalic acids were also decarboxylated: 4,5
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11. Metabolism of Di- and Mono-n-Butyl Phthalate by Soil Bacteria
Di-n-butyl phthalate and other dialkyl phthalates are used as carbon sources by three Nocardia sp. isolates; mono-n-butyl phthalate is used as a carbon source by an Arthrobacter sp. isolate and a Pseudomonas sp. isolate. The compounds were metabolized in these organisms by hydrolysis to the corresponding monoesters and free phthalic acid. Phthalic acid was t
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12. Anaerobic metabolism of phthalate and other aromatic compounds by a denitrifying bacterium.
The anaerobic metabolism of phthalate and other aromatic compounds by the denitrifying bacterium Pseudomonas sp. strain P136 was studied. Benzoate, cyclohex-1-ene-carboxylate, 2-hydroxycyclohexanecarboxylate, and pimelate were detected as predominant metabolic intermediates during the metabolism of three isomers of phthalate, m-hydroxybenzoate, p-hydroxybenz