Development and validation by accuracy profile of a method for the analysis of monoterpenes in indoor air by active sampling and thermal desorption-gas chromatography-mass spectrometry

Marlet, Christelle; Lognay, Georges

doi:10.1016/j.talanta.2010.06.044

Cited by 27 publications

(13 citation statements)

References 51 publications

(91 reference statements)

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“…Thus, the measured value of FeO is much closer to the certified value, which reveals that aerial oxidation of FeO is almost inhibited in method A. The detection limit was evaluated as described elsewhere [30][31][32] and was found within 0.2 ppm.…”

Section: Precision and Accuracysupporting

confidence: 68%

A Comparative Spectrophotometric Study Using Ferrozine and 1,10-Ortho-phenanthroline to Evaluate the Iron Redox Ratio (Fe2+/ΣFe) in Glass Prepared by Microwave Heating

et al. 2016

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In the present study, Fe-doped barium borosilicate glass has been melted at 1250 C under microwave heating. The iron redox ratio (Fe 2+ /total Fe) in the glass is investigated by two spectrophotometric methods. A novel decomposition technique has been optimized to measure the ferrous oxidation state in glass. Ferrozine was chosen as a specific complexing reagent; it forms a deep violet color complex with Fe 2+ and has a broad absorbance peak centered at ~562 nm. 1,10-ortho-phenanthroline develops an orange color complex with Fe 2+ (having an absorbance peak centered at ~510 nm) and has been used to determine ferrous ion in glass. Both the methods are compared and the estimated redox ratio was found to be higher in the ferrozine method. The error limit of measurement has been determined as 0.012 and 0.023 for the ferrozine and 1,10-ortho-phenanthroline methods, respectively.

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Section: Precision and Accuracysupporting

confidence: 68%

A Comparative Spectrophotometric Study Using Ferrozine and 1,10-Ortho-phenanthroline to Evaluate the Iron Redox Ratio (Fe2+/ΣFe) in Glass Prepared by Microwave Heating

et al. 2016

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“…The international procedures of metrology are a useful tool to characterize the strengths and limits of the analytical methods used in each laboratory (Rozet et al, 2007;Marlet and Lognay, 2010) with multiple applications, such as the reduction in the number of analyses (Lemosquet et al, 2004). As pointed out by Feinberg and Laurentie (2006), the accuracy profile is able to account for heterogeneity of variances as a function of concentra- Figure 2.…”

Section: Discussionmentioning

confidence: 99%

Influence of the para-aminohippuric acid analysis method on the net hepatic flux of nutrients in lactating cows1

Rodríguez-López

Cantalapiedra-Hijar

Durand

et al. 2014

Journal of Animal Science

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Para-aminohippuric acid (pAH) is a marker frequently used to measure plasma or blood flow. In sheep studies, it is recognized that its determination must include a deacetylation step to counteract the hepatic acetylation of pAH. Such a procedure is not of common usage in cattle studies although a recent suggestion of hepatic pAH acetylation in dairy cows may have important consequences for hepatic nutrient fluxes. The aims of this study were to evaluate pAH analytical methods according to international procedures of metrology and confirm hepatic acetylation of pAH in dairy cows. The effect of the matrix used to prepare the standard curve was tested, and the influence of the pAH analytical method on blood flows and subsequent net hepatic fluxes of nutrients was determined. For the first objective, accuracy profiles were established and bias, indicators of precision, and limits of quantification were reported for 2 analytical methods (without and with a pAH deacetylation step) using 2 different standard matrices (water and plasma). Second, the net hepatic flux of different nutrients was determined including or not the deacetylation step and preparing the standard curves in plasma using samples collected from 5 multicatheterized lactating Jersey cows. The choice of the matrix had a significant impact on plasma pAH concentrations as illustrated by accuracy profiles. Water matrix decreased (P < 0.01) the slope, y-intercept, and the absorbance at concentration 0 mg pAH/L of the standard curve in both methods (without and with the deacetylation), supporting that standards prepared in water should not be used to analyze plasma samples. Samples collected on cows confirmed hepatic acetylation of pAH across the liver. Deacetylation, performed using plasma as the standard matrix, increased (P < 0.05) plasma pAH concentrations from 18.4, 26, and 23.5 to 21.4, 28.9, and 27.3 mg/L in the artery, portal vein, and hepatic vein, respectively. Deacetylation decreased the hepatic venous and arterial plasma and blood flows (P< 0.05) by 9 and 55%, respectively, modifying the net hepatic flux of acetate, total amino acid, and oxygen by more than 19% (P < 0.05). In conclusion, our results highlight the importance of including a deacetylation step in the pAH analysis method in cattle studies and of using plasma as standard matrix.

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“…Les tubes de prélèvements actifs ont également été agencés au centre de la pièce à côté de la deuxième série de Radiello. Les prélèvements actifs ont été réalisés sur une période de 30 minutes avec un débit de 50 ml min -1 [26].…”

Section: Prélèvements Sur Siteunclassified

“…Un étalonnage à partir de cartouches dopées par ajout liquide a été réalisé de façon systématique avant chaque lot de cartouches à analyser. Avant chaque utilisation, les cartouches ont été reconditionnées [26].…”

Section: Introductionunclassified

Évaluation d’une méthode d’échantillonnage passif pour la mesure des monoterpènes dans l’air intérieur

Marlet¹,

Lognay²,

Plaisance³

et al. 2011

Pollution Atmosphérique

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Les monoterpènes sont des composés naturellement émis par les matériaux à base de bois. Une enquête préliminaire a démontré lʼoccurrence de certains monoterpènes dans les constructions à ossature bois. À lʼinverse des prélèvements actifs, les prélèvements passifs à lʼaide du dispositif Radiello® simplifient lʼétape dʼéchantillonnage des composés dʼintérêt dans les milieux intérieurs. Toutefois, la connaissance du débit dʼéchantillonnage est nécessaire pour une quantification via les échantillonneurs passifs Radiellos®. Ces échantillonneurs (Radiello® Tenax TA avec un corps diffusif en polyéthylène microporeux) ont été évalués pour neuf monoterpènes (α-pinène, β-pinène, d-limonène, Δ 3-carène, camphène, carvone, 1,8-cinéole, linalool et p-cymène) sur une durée de 4 heures. Les paramètres de la méthode (droite dʼétalonnage, justesse, répétabilité, niveau de blanc, stabilité…) ont été estimés.

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Development and validation by accuracy profile of a method for the analysis of monoterpenes in indoor air by active sampling and thermal desorption-gas chromatography-mass spectrometry

Cited by 27 publications

References 51 publications

A Comparative Spectrophotometric Study Using Ferrozine and 1,10-Ortho-phenanthroline to Evaluate the Iron Redox Ratio (Fe2+/ΣFe) in Glass Prepared by Microwave Heating

A Comparative Spectrophotometric Study Using Ferrozine and 1,10-Ortho-phenanthroline to Evaluate the Iron Redox Ratio (Fe2+/ΣFe) in Glass Prepared by Microwave Heating

Influence of the para-aminohippuric acid analysis method on the net hepatic flux of nutrients in lactating cows1

Évaluation d’une méthode d’échantillonnage passif pour la mesure des monoterpènes dans l’air intérieur

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