Application of polyurethane-based devices as sorption-desorption phases for microextraction analysis – The all-in-one microextraction concept

Mourão, Marta P.B.; Silva, I.; Almeida, Cristina; Neng, Nuno R.; Nogueira, J.M.F.

doi:10.1016/j.chroma.2017.01.005

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…Despite of the high complexity of the matrix of the sample, RSDs of 9.6% or less were obtained for the studied herbicides, demonstrating the high reproducibility of the proposed technique. Furthermore, these results are comparable, in terms of precision, with previous described methods for determination of the studied herbicides , as can be seen in Supporting Information Table S10. Regarding LOD, although these extraction methods showed lower values, the fact that extraction and derivatization procedures were carried out simultaneously and automatically results in lower reagents consumption and a simpler method that can perform the sample pretreatment unattended, which results in a significant time saving for the analyst.…”

Section: Resultssupporting

confidence: 83%

Determination of herbicides in environmental water samples by simultaneous in‐syringe magnetic stirring‐assisted dispersive liquid–liquid microextraction and silylation followed by GC–MS

Suárez

Clavijo

González

et al. 2018

J of Separation Science

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An on-line, fast, simple, selective, and sensitive method has been developed for the determination of three herbicides belonging to the following families: triazines (atrazine), chloroacetamide (alachlor), and phenoxy (2,4-dichlorophenoxyacetic acid) in water samples. The method involves an in-syringe magnetic stirring-assisted dispersive liquid-liquid microextraction along with simultaneous silylation prior to their determination by gas chromatography with mass spectrometry. Extraction, derivatization, and preconcentration have been simultaneously performed using acetone as dispersive solvent, N-methyl-N-tert-butyldimethylsilyltrifluoroacetamide as derivatization agent and trichloroethylene as extraction solvent. After stirring for 180 s, the sedimented phase was transferred to a rotary micro-volume injection valve (3 μL) and introduced by an air stream into gas chromatograph with mass spectrometry detector. Recovery and enrichment factors were 87.2-111.2% and 7.4-10.4, respectively. Relative standard deviations were in the ranges of 6.6-7.4 for intraday and 9.2-9.6 for interday precision. The detection limits were in the range of 0.045-0.03 μg/L, and good linearity was observed up to 200 μg/L, with R ranging between 0.9905 and 0.9964. The developed method was satisfactorily applied to assess the occurrence of the studied herbicides in groundwater samples. The recovery test was also performed with values between 77 and 117%.

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Section: Resultssupporting

confidence: 83%

Determination of herbicides in environmental water samples by simultaneous in‐syringe magnetic stirring‐assisted dispersive liquid–liquid microextraction and silylation followed by GC–MS

Suárez

Clavijo

González

et al. 2018

J of Separation Science

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“…Most applications of SBSE are extractions of organic compounds present at low concentrations in liquid samples [140]. Other types of methodologies, similar to SBSE, have been proposed for the analysis of more polar analytes in water matrices, such as bar adsorptive microextraction (BAmE) and polyurethane-phases for microextraction (PUmE) [154,155]. These promising approaches operate based on the floating sampling mode, in which the bar or the PU foam is standing just below the vortex formed by the agitation of the sample flasks, represented in Fig.…”

Section: Recent Developments In Sample Preparation For Gc-msmentioning

confidence: 99%

“…These promising approaches operate based on the floating sampling mode, in which the bar or the PU foam is standing just below the vortex formed by the agitation of the sample flasks, represented in Fig. 1.1.18 [155].…”

Section: Recent Developments In Sample Preparation For Gc-msmentioning

confidence: 99%