Evaluation of automated splitless and manual on-column injection techniques using capillary gas chromatography for pesticide residue analysis

Stan, Hans‐Jürgen; Goebel, H.

doi:10.1016/s0021-9673(01)97755-6

Cited by 22 publications

(3 citation statements)

References 10 publications

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“…Embora os primeiros trabalhos sobre a influência da matriz nas análises de agrotóxicos por cromatografia tenham sido publicados a partir de 1981, [17][18][19][20][21][22][23] considera-se que o efeito de matriz foi sistematicamente estudado pela primeira vez por Erney et al 24 Além disso, esses autores verificaram que melhor precisão dos resultados era obtida após injeções sucessivas da solução-padrão preparada no extrato da matriz isenta dos agrotóxicos, ou seja, só se conseguia boa repetitividade dos resultados após a saturação do sistema cromatográfico com os componentes da matriz. 24 Em avaliação inicial do mecanismo do efeito de matriz, Erney et alverificaram que fatores como tipo de matriz, concentração do agrotóxico na amostra, tipo de injetor e temperatura do sistema cromatográfico poderiam influenciar também nos resultados.…”

Section: Aspectos Históricosunclassified

Efeito de matriz na quantificação de agrotóxicos por cromatografia gasosa

Pinho¹,

Neves²,

Queiroz³

et al. 2009

Quím. Nova

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Recebido em 8/2/08; aceito em 2/9/08; publicado na web em 15/4/09 MATRIX EFFECT IN PESTICIDE QUANTIFICATION BY GAS CHROMATOGRAPHY. The lack of accuracy of a chromatographic method can be associated with the matrix effect. This effect is observed in pesticide quantification by gas chromatography when the chromatographic signals of standards prepared in solvents are compared with those of the analyte in extracts of complex matrices. In the competition between the matrix components and the pesticides for the active sites of the liner, a larger amount of pesticides is transferred to the column, giving apparent extractions above 100%. In this work, we discuss factors that contribute to the matrix effect and present some attempts to overcome the problem.

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Section: Aspectos Históricosunclassified

Efeito de matriz na quantificação de agrotóxicos por cromatografia gasosa

Pinho¹,

Neves²,

Queiroz³

et al. 2009

Quím. Nova

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“…These are known to promote the breakdown of several OCPs, for example endrin and DDT, thereby leading to underestimations [43] [44] [45]. This phenomenon has been used to judge the performance of inert liners and capillary columns [46] [47] [48].…”

Section: Use Of Internal Standards and Gc Linersmentioning

confidence: 99%

Efficiency Evaluation of Extraction Methods for Analysis of OCPs and PCBs in Soils of Varying TOC

Mülow-Stollin¹,

Lehnik-Habrink²,

Kluge³

et al. 2017

JEP

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Organochlorine pesticides and polychlorinated biphenyls are toxic, carcinogenic, and have a high potential for bioaccumulation. Due to their stability, they are still considered an environmental problem even though the use of most of them has been phased out several decades ago. Soil is a matrix which can retain these contaminants to a great extent. This ability is often associated with the total organic carbon content (TOC). In order to judge the pollution status of soil and to make monitoring data more easily comparable a simple, yet robust extraction method is needed. Agitation solid-liquid-extraction is well suited for this purpose. However, the influence of TOC on the analyte recovery has to be known. For the presented study, 12 organochlorine pesticides and 7 polychlorinated biphenyls were spiked into four model soils with organic carbon contents between 1.6% -13.3%. The matrices were extracted using solid-liquid extraction between 45 minutes and 16 hours. For comparison, all soils were also extracted using pressurised liquid extraction and Soxhlet extraction. After clean-up the extracts were measured using a gas chromatography-mass spectrometry (GC-MS) system. Statistical analysis of the results implied that the TOC content of the soils did not have significant influence on the extraction efficiency. A longer solid-liquid extraction time did not necessarily increase analyte recovery: Extraction for one hour resulted in 88% recovery while 16 hour extraction led to 89%. Thus, the efficiency of all the methods was comparable for all model soils. Additional investigations regarding GC liner performance highlighted the need for isotopically labelled standards during the analysis of thermolabile pesticides.

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“…Although the use of a matrix-matched standard proves to reduce some of the effects caused by these active sites in other matrices [10], some problems always occur when we try to apply it in the analysis of oil samples (shortened column life). As an alternative, we use an analyte protectant in our analyses [11]; d-xylose was added to all the working standards (5 mg in 2 mL working standard) and shaken for 1 min prior to the GC analysis, as compensation to the matrix enhancement effects in the real samples.…”

Section: Matrix Effectmentioning

confidence: 99%

Determination of acephate, methamidophos and monocrotophos in crude palm oil

Yeoh

Kuntom

Dorasamy

et al. 2006

Eur. J. Lipid Sci. Technol.

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A method for the determination of acephate, methamidophos and monocrotophos in oil matrices is described. Pesticide residues in crude palm oil were extracted with acetonitrile, and a clean-up process was performed by cooling the entire extract below 10 7C, followed by a discolouring process using a Carbograph SPE cartridge. The extract was analysed using gas chromatography coupled with a pulsed flame photometry detector. The limit of detection for the method was calculated from regression data, and the recovery test results were in the range of 85-109%.

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Evaluation of automated splitless and manual on-column injection techniques using capillary gas chromatography for pesticide residue analysis

Cited by 22 publications

References 10 publications

Efeito de matriz na quantificação de agrotóxicos por cromatografia gasosa

Efeito de matriz na quantificação de agrotóxicos por cromatografia gasosa

Efficiency Evaluation of Extraction Methods for Analysis of OCPs and PCBs in Soils of Varying TOC

Determination of acephate, methamidophos and monocrotophos in crude palm oil

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