Optimization of a Methodology for the Determination of Organochlorine Pesticides in Surface Water by SPME-GC<b>/</b>MS

Brondi, S. H. G.; Lanças, Fernando Mauro

doi:10.1081/pfc-200061508

Cited by 12 publications

(8 citation statements)

References 19 publications

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“…The samples were incubated at 551C for 2 min. Adsorption of compounds from water samples on the PA 85 mm fibre was carried out by stirring the vial on the agitator for 30 min at 551C and the stirring speed of 250 rpm (Brondi & Lancas 2005). After adsorption the PA 85 mm fibre was transferred to the injector port where the thermal desorption at 2501C occurred.…”

Section: Analytical Methods (Spme/gc-ms)mentioning

confidence: 99%

“…The Gerstel MPS autosampler was used to allow automated SPME analysis. Samples were exposed to micro extraction procedure (SPME) using SPME fibre (Supelco, Sigma-Aldrich) coated with polyacrylate (PA) 85 mm (Eisert & Levsen 1996;Brondi & Lancas 2005). The PA fibre was conditioned in the hot injector of the gas chromatograph according to instructions provided by the supplier.…”

Section: Analytical Methods (Spme/gc-ms)mentioning

confidence: 99%

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Comparison of Fenton's oxidation and ozonation for removal of estrogens

Nakrst

Bistan

Tišler

et al. 2011

Water Science and Technology

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This study compares efficiency of Fenton's oxidation and ozonation of 17beta-estradiol (E2) and 17alpha-ethinylestradiol (EE2) as two possible processes for removal of estrogens from aqueous solutions. The effectiveness of Fenton's oxidative removal was studied at different ratios of reagents Fe2+:H2O2 (1:0.5; 1:10; 1:20; 1:33), where with some molar ratios up to 100% removal of E2 and EE2 was achieved in the first few minutes of reaction. The best molar ratio for E2 (17beta-estradiol) removal was 1:33, while in the case of EE2 the most efficient one was 1:20 ratio. Ozonation was much faster, because complete removal of estrogens was achieved in 30 seconds (pH approximately eaqual 6), but the time of ozonation was extended up to 60 minutes trying to decompose formed by-products, expressing estrogenic activity, detected by YES (Yeast Estrogen Screening) assay. The obtained results showed that the removal efficiency of estrogens from waters should be assessed by a combination of chemical analyses and bioassay.

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Section: Analytical Methods (Spme/gc-ms)mentioning

confidence: 99%

Section: Analytical Methods (Spme/gc-ms)mentioning

confidence: 99%

Comparison of Fenton's oxidation and ozonation for removal of estrogens

Nakrst

Bistan

Tišler

et al. 2011

Water Science and Technology

View full text Add to dashboard Cite

show abstract

“…The samples were incubated at 55°C for 2 min. Adsorption of compounds from water samples on the PA 85 lm fiber was carried out by stirring the vial on the agitator for 30 min at 55°C and a stirring speed of 250 rpm (Brondi and Lancas 2005). After adsorption, the PA 85 lm fiber was transferred to the injector port where thermal desorption at 250°C occurred.…”

Section: Analytical Methods (Spme/gc-ms)mentioning

confidence: 99%

“…The Gerstel MPS autosampler was used to allow automated SPME analysis. Samples were exposed to microextraction procedure (SPME) using SPME fiber (Supelco, Sigma-Aldrich) coated with polyacrylate (PA) 85 lm (Brondi and Lancas 2005;Eisert and Levsen 1996). The PA fiber was conditioned in the hot injector of the gas chromatograph according to the instructions provided by the supplier.…”

Section: Analytical Methods (Spme/gc-ms)mentioning

confidence: 99%

The relevance of bisphenol A adsorption during Fenton’s oxidation

Gotvajn

Bistan

Tišler

et al. 2013

Int. J. Environ. Sci. Technol.

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The aim of this research was to assess the efficiency of Fenton's oxidation for degradation of endocrine disruptor bisphenol A (BPA) with emphasis on extent of accompanying adsorption. Adsorption on the waste sludge resulting from the Fenton's oxidation could represent a significant impact on the final removal efficiency of BPA. Fenton's oxidation was accomplished at two concentrations of BPA (0.228 and 22.8 mg L ). In addition to changing concentrations of BPA and sludge, the adsorption process was also influenced by parameters such as temperature, pH and contact time. Adsorption isotherms were determined. Oxidation and adsorption were monitored by gas chromatography combined with mass spectrum. It has been confirmed that BPA is not completely oxidized in Fenton's oxidation, because it is adsorbed to formed waste ferric sludge and thus necessary precautions for sludge deposition must be observed.

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“…For this reason, other methods have appeared, reducing or even eliminating the use of organic solvents, among which Solid Phase Micro Extraction (SPME) has received special attention. SPME, developed by Pawliszyn, was initially applied to analyses of pollutants in water matrix, that demanded its application to trace determination of great contaminants diversity in this matrix, like chlorinated pesticides [12] , organophosphorous pesticides [13] , aldehydes [14] , phenols [15] , pyrethroid [16] , among others [17] , with the obtainment of excellent results.…”

Section: Introductionmentioning

confidence: 99%

Development, validation and application of a method to analyze phenols in water samples by solid phase micro extraction-gas chromatography-flame ionization detector

Lanças¹,

Olivares²,

Alves³

2007

Journal of Environmental Science and Health, Part B

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In this work the development, validation and application of method using Solid Phase Microexctration (SPME) for the analyses of five pollutants (phenol, 2-nitrophenol, 2,4-dimethylphenol, 2,4-dichlorophenol and 4-chloro, 3-methyl phenol) in supplying water, using gas chromatography (GC) with flame ionization detector (FID) is described. The optimal conditions obtained for SPME were: fiber type: Poliacrylate (PA); extraction time: 40 minutes; extraction temperature: 70 degrees C; amount of salt added to sample (NaCl): 15%; desorption temperature: 8 minutes. The parameters studied in the method validation were: limit of detection (0.3 and 3.5 microg.L(- 1)); precision, measured by the variation coefficient (between 2.1 and 8.8%); calibration curve and linearity, by using the external standardization method (between 1 and 50 50 microg.L(- 1)). After the methodology development, samples of water collected in Atibaia River (São Paulo - Brazil) were analyzed, using the optimized methodology. Three water samples collected in the rain season showed a peak with retention time close to 4-chloro, 3 methyl phenol further analyzed by Gas Chromatography-Mass Spectrometry for the identity confirmation. In spite of the fact that none target compounds were found in the river water samples analyzed, the presence of two phenols different from those investigated (p-terc butyl phenol; butylated hydroxytoluene) were detected. These results together with the results of the limit of detection (that showed to be lower than the maximum concentration of phenols demanded by different environment control agencies), and the results of the validation, indicate the applicability of this method for the analysis of selected phenols in river water samples.

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Optimization of a Methodology for the Determination of Organochlorine Pesticides in Surface Water by SPME-GC/MS

Cited by 12 publications

References 19 publications

Comparison of Fenton's oxidation and ozonation for removal of estrogens

Comparison of Fenton's oxidation and ozonation for removal of estrogens

The relevance of bisphenol A adsorption during Fenton’s oxidation

Development, validation and application of a method to analyze phenols in water samples by solid phase micro extraction-gas chromatography-flame ionization detector

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