Search results

1

Polyaniline-polypyrrole coating for solid phase microextraction

100%

Vickackaite V., Ciuvasovaite V.

Open Chemistry

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2007

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vol. 5

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issue 3

727-738

EN

A procedure for direct electrochemical deposition of polyaniline-polypyrrole blend coating on the surface of stainless steel wire was suggested. Incorporation of polyaniline and polypyrrole into the blend coating was confirmed by infrared spectroscopy. Key parameters (pyrrole, aniline, dopant and sulphuric acid concentrations and deposition potential) influencing the coating’s mechanical stability and surface homogeneity were optimised and thermostability of the coating was investigated. A possibility to apply the coating as a new fibre for solid phase microextraction was demonstrated. The coating showed better selectivity toward aromatic, hydrophobic compounds. [...]

2

Simultaneous determination of 223 pesticides in tobacco by GC with simultaneous electron capture and nitrogen-phosphorous detection and mass spectrometric confirmation

100%

Lozowicka B., Rutkowska E., Hrynko I.

Open Chemistry

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2015

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vol. 13

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issue 1

EN

LSE (liquid-solid extraction), MSPD (matrix solid phase dispersion) and QuEChERS (quick, easy, cheap, effective, rugged and safe) extractions followed by GC-μECD/NPD to determine 223 pesticide residues in tobacco simultaneously were developed and compared. The identities of ten model pesticides were confirmed by GC-MS/MS. The type and amount of dispersant (Florisil, silica gel and alumina), sample mass, cleanup adsorbent, and the eluent (hexane, acetone and acetonitrile) were optimized. Linearity, recovery, LOQ, LOD, and matrix effect were compared. Most recoveries were 71−120% (RSD < 18%). LOD and LOQ were much lower than the CORESTA GRLs. The best method was QuEChERS: acetonitrile extraction and dispersive solid-phase extraction using primary-secondary amine and graphitized carbon.

3

Pilot study on feasibility of application of gas chromatography for the assessment of acrylamide concentration in sewage sludge

100%

Włodarczyk E., Próba M., Wolny L., Wojtal Ł.

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2014

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vol. 61

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issue 2

201-203

EN

The aim of this study was to determine the possibility of using gas chromatography to measurement of the acrylamide concentration in sewage sludge. Acrylamide, as a toxic substance, is not indifferent to human health, but it is used in the production of plastics, dyes, adhesives, cosmetics, mortar, as well as a coagulant for water treatment, wastewater or sewage sludge conditioning. Determination of acrylamide by gas chromatography was based on standard: EPA Method 8032A "Acrylamid by gas chromatography." It consists of a bromination reaction of the compound in the presence of dibromopropendial derivative, a triple extraction with the ethyl acetate, a concentration of the eluate sample up to the 1 ml volume, and an analysis by the gas chromatography using an electron capture detector (ECD). The acrylamide concentration of was calculated according to the formula presented in the mentioned standard. All samples were performed twice (the difference between the results was not greater than 10%), and the average value of the four samples was 17.64 µg/L−1. The presence of acrylamide in sewage sludge has been confirmed.

4

Electron beam irradiation of r-SANEX and i-SANEX solvent extraction systems: analysis of gaseous products

100%

Szreder T., Kocia R.

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issue 4

899-905

EN

1-Octanol/kerosene mixtures and water contacted with organic solvents were used as model solutions for r-SANEX and i-SANEX extractions systems. Investigations aimed on a quantitative evaluation of gaseous products generated in these systems under exposure to an electron beam irradiation. Influence of O2, HNO3 and the presence of model ligands and complexes on the radiation chemical yields was studied. Relatively high G(H2) values (up to 420 nmol·J-1) for the organic phase compromise the safety issues of the extraction process and should be considered on the stage of extraction apparatus design. Based on the obtained results gaseous hydrocarbons seem to have negligible impact on safety issue. The upper limit of G(H2) values in water contacted with organic phase was established to be 85 nmol·J-1. This value is relatively low, however, the literature data indicate that G(H2) values measured in aqueous solutions are over twice higher for α-particles irradiation than for electron beam or γ-irradiation. Thus, further investigations of these systems are necessary.

5

PURITY DETERMINATION OF THE STARTING MATERIALS USED IN THE SYNTHESIS OF PHARMACEUTICAL SUBSTANCES

88%

Groman A., Stolarczyk E., Mucha M.

Acta Poloniae Pharmaceutica - Drug Research

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2019

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vol. 76

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issue 1

29-35

EN

High requirements on the API quality mean that the quality control of the starting material is crucial to the manufacturing process of drug substances. Three sensitive methods for the purity determination of the following starting materials: ethylene glycol (method I), 3-acetylpyridine (method II) and 4-chloromethyl-5-methyl-1,3-dioxol-2-one (method III) used in the synthesis of selected drug substances were developed using GC-FID techniques. All the methods were validated according to the International Conference on Harmonization guidelines. The correlation coefficient values were found about 0.99. The obtained RSD values from the replicate injections in the range of 20 - 120% of the nominal concentration ensured the precision.

6

Studies on carcinogenic PAHs emission generated by vehicles and its correlation to fuel and engine types

88%

Kumar V., Kothiyal N. C., Saruchi

Polish Journal of Chemical Technology

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2014

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vol. 16

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issue 1

48-58

EN

The objective of this study was to find major PAHs produced in ambient air from the automobile exhaust as a function of fuels (diesel, petrol, and biodiesel) and engine type qualitatively and quantitatively. The recovery range was found between 30% and 70%. The study was carried out on two, three, and four wheelers. Biodiesel samples tested in the study were synthesized indigenously from different starting raw materials and analyzed for PAHs concentration in the exhaust on a Honda genset (EBK 2000AC Model). Biodiesel samples were blended with diesel in different ratio (25:75, 35:65 and 45:55) to investigate the exhaust behavior. Biodiesel was blended with Diesel the concentration of almost all PAHs reduces in comparison to pure Diesel exhaust. B(a)A and B(a) P was the common PAH found in higher concentration in almost all fuels. FTIR results indicate esterification of vegetable oil and NMR results indicate a complete conversion of oils into biodiesel.

7

Polycyclic aromatic hydrocarbon in African Giant Snail (Archachatina marginata (Swainson, 1821))

88%

Ikwuagwu P., Bassey F. I., Iwegbue C. M. A.

|

EN

The concentrations of polycyclic aromatic hydrocarbons (PAHs) were examined in African Giant Snail samples collected from five snail farms in Etche Local Government Area, Port Harcourt, Rivers State, Nigeria. With the view to providing information on the health risks to humans from the consumption of these foods. The concentrations of PAHs were measured by means of Gas Chromatography Mass Spectrophotometer (GC-MS). The results obtained from the analysis showed that the concentrations of 16 PAHs in the snails ranged from 0.04 to 4.148 mg/kg. The dominant PAHs compounds in the snail species were 3-, 5- and 7- rings PAHs which are phenanthrene, benzo(b)fluoranthrene and indeno(1,2,3-cd)pyrene which suggests worrisome pollution levels of the soil and environment of Port Harcourt Nigeria. The findings of this study thus point to the need for improved caution in the consumption of snails harvested from the study area. It is expected that this will help to improve public health awareness and practice.

8

Identification Odor Compounds Emitted During the Heating of Molding Sands

75%

Perszewska K., Faber J.

Archives of Foundry Engineering

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2017

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vol. 17

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issue 2

9

Preliminary suggestions on the Pleistocene palaeovegetation around the Biśnik Cave (Częstochowa Upland, Poland) based on studies of molecular fossils from cave sediments

75%

Krajcarz M. T., Gola M. R., Cyrek K. J., Krajcarz M. T., Gola M. R., Cyrek K. J.

Studia Quaternaria

|

2010

|

vol. 27

10

Simplified Calibration Methodology of Chromatographs Used in Custody Transfer Measurements of Natural Gas

75%

de Oliveira E.

Metrology and Measurement Systems

|

2012

|

issue 2

11

Reduction of polycyclic aromatic hydrocarbons and nitrogen monooxide in combustion engine exhaust gases by clinoptilolite

63%

Mačala J., Pandová I., Gondová T., Dubayová K., Mačala J., Pandová I., Gondová T., Dubayová K.

Gospodarka Surowcami Mineralnymi

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2012

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vol. 28

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issue 2

12

Antifungal activity of Trichoderma VOCs against Pyrenophora teres, the causal agent of barley net blotch

63%

Moya P., Girotti J. R., Toledo A. V., Noemi S. M.

Journal of Plant Protection Research

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2018

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vol. 58

|

issue 1

Refine search results

Polyaniline-polypyrrole coating for solid phase microextraction

Simultaneous determination of 223 pesticides in tobacco by GC with simultaneous electron capture and nitrogen-phosphorous detection and mass spectrometric confirmation

Pilot study on feasibility of application of gas chromatography for the assessment of acrylamide concentration in sewage sludge

Electron beam irradiation of r-SANEX and i-SANEX solvent extraction systems: analysis of gaseous products

PURITY DETERMINATION OF THE STARTING MATERIALS USED IN THE SYNTHESIS OF PHARMACEUTICAL SUBSTANCES

Studies on carcinogenic PAHs emission generated by vehicles and its correlation to fuel and engine types

Polycyclic aromatic hydrocarbon in African Giant Snail (Archachatina marginata (Swainson, 1821))

Identification Odor Compounds Emitted During the Heating of Molding Sands

Preliminary suggestions on the Pleistocene palaeovegetation around the Biśnik Cave (Częstochowa Upland, Poland) based on studies of molecular fossils from cave sediments

Simplified Calibration Methodology of Chromatographs Used in Custody Transfer Measurements of Natural Gas

Reduction of polycyclic aromatic hydrocarbons and nitrogen monooxide in combustion engine exhaust gases by clinoptilolite

Antifungal activity of Trichoderma VOCs against Pyrenophora teres, the causal agent of barley net blotch