Accueil
Détail de l'auteur
Auteur Anna Bacardit |
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la recherche
Determination of hexavalent chromium in leather by ion-exchange chromatography. Direct method versus post-column derivatisation method / Irene Compte in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 4 (07-08/2021)
[article]
Titre : Determination of hexavalent chromium in leather by ion-exchange chromatography. Direct method versus post-column derivatisation method Type de document : texte imprimé Auteurs : Irene Compte, Auteur ; Rosa M. Cuadros, Auteur ; Anna Bacardit, Auteur ; Felipe Combalia, Auteur ; Joaquim Font, Auteur Année de publication : 2021 Article en page(s) : p. 175-182 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie par échange d'ions
Chrome hexavalent
Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- Analyse
Extraction (chimie)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The ISO 17075-2 Standard was published in 2017. In this standard appeared for the first time the determination of hexavalent chromium in leather by liquid chromatography. Two alternative instrumental options are proposed in this method: the direct determination of the absorbance of the chromate peak (Annex B of the Standard) or after the post-column derivatisation with diphenylcarbazide (Annex C). Instrumental performance parameters and economic costs between both methods are compared in this paper. One hundred different leathers were analysed by both chromatographic systems. The two methods proved very good correlation. The post-column method has a higher instrumental sensitivity compared to the direct detection method, which is important to reduce the uncerteinty of the measure in semples around the 3mg/kg current regulatory limit. Other important advantages are its absolute selectivity, which allows the secure identification of the hexavalent chromium in all type of complicated matrixes, and the higher durability of its well protected columns due to the use of cost-effective guard columns. Due to the technical advantages and the slight difference in the equipment cost, which can be compensated thanks to the larger lifespan of the chromatographic columns, it is concluded that the post-column method is the most suitable option for the most determination of hexavalent chromium in leather. Note de contenu : - MATERIALS AND METHODS : Chemicals - Samples - Extraction
- RESULTS AND DISCUSSION : Optimisation of the post-column conditions - Method validation - Repeatability and accuracy of the post-column determination method - Analysis of leather samples - Economic assessment
- Table 1 : Optimisation of the mobile phase ionic strength
- Table 2 : Optimisation of the mobile phase flow
- Table 3 : Optimisation of the post-column reagent flow
- Table 4 : Comparison of three different cartridges
- Table 5 : Concentration of Cr(VI) obtained in 14 leather samples, all of them above 3.0 mg/kg
- Table 6 : Evaluation of the Cr(VI) results in 100 leather samplesEn ligne : https://drive.google.com/file/d/13VmY0k59wMY6TKIykzgnXLA9wEalFumN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36106
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 4 (07-08/2021) . - p. 175-182[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22841 - Périodique Bibliothèque principale Documentaires Disponible Determination of penetration and fixation curves of leather using humic derivatives / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 3 (05-06/2012)
[article]
Titre : Determination of penetration and fixation curves of leather using humic derivatives Type de document : texte imprimé Auteurs : Anna Bacardit, Auteur ; A. Shendryk, Auteur ; Josep Maria Morera, Auteur ; Jordi Bou, Auteur ; Lluis Ollé, Auteur Année de publication : 2012 Article en page(s) : p. 114-118 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides humiques Les acides humiques sont des polymères à haut poids moléculaire, chargés négativement, de couleur noire à brun foncé, résultant d'un processus de condensation oxydative des composés phénoliques et liés à des acides aminés, des peptides et des polysaccharides. Ils sont riches en carbone mais moins riches en oxygène.
Cuir
Retannage
TannageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study examines the behavior of three different types of humic acids (natural humic acids, regenerated humic acids, and sulphited humic acids) with regard to their penetration and fixation to the leather. More specifically, through the test carried out the curves of penetration and fixation were drawn, and from these the optimum pH intervals of penetration and fixation to the leather were determined. The data obtained is essential in view of the subsequent application of humic acids as tanning agents and/or retanning agents. Note de contenu : - INTRODUCTION : Current situation - Importance of the conditions of penetration and fixation of tanning agents to the leather
- EXPERIMENTAL : Raw material, machinery, and reactants used - Development of penetration-fixation curves
- RESULTS AND DISCUSSION : Curve of penetration-fixation for HNA (Natural Humic Acids) - Curve of penetration-fixation for RHA (Regenerated Humic Acids) - Curve of penetration-fixation for SHA (Sulphited Humic Acids)En ligne : https://drive.google.com/file/d/1ezHA0ijseroJRCb3C-sKmDMFSo0gtCOD/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15258
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 3 (05-06/2012) . - p. 114-118[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 13973 - Périodique Bibliothèque principale Documentaires Disponible Determination of TCMTB and other fungicides in leather / Joaquim Font in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 11 (11/2011)
[article]
Titre : Determination of TCMTB and other fungicides in leather Type de document : texte imprimé Auteurs : Joaquim Font, Auteur ; M. Reyes, Auteur ; Sara Cuadros, Auteur ; Anna Bacardit, Auteur ; Agusti Marsal, Auteur Année de publication : 2011 Article en page(s) : p. 341-348 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques
Cuir
Thiocyano-méthylthiobenzotiazoleIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The new ISO 13365:2011 develops a test method for the determination of the content of the preservative agents 2-(thiocyanomethylthio)-benzothiazole (TCMTB), 4-chloro-3-methylphenol (PCMC), 2-phenylphenol (OPP) and 2-Octyl-3(2H)-isothiazolone (OIT) in leather by liquid chromatography. The simultaneous determination of the fungicides TCMTB, PCMC, OPP, OIT, and also 2-mercaptobenzothiazol (MBT) and 3-iodo-2-propynyl-butylcarbamate (IPBC) in leather samples was carried out by liquid chromatography (HPLC) with diode array ultraviolet detection. The sample preparation and extraction step was performed following the new ISO 13365 Standard. The mobile phase was 0.1% formic acid in water (A) : 0.1% formic acid in acetonitrile (B). Gradient: 60% B, 6 min isocratic, then linear to 95% B in 9 min. The chromatographic detection introduced only a minor change with respect to the Standard: a photo diode array detector was used instead of a single wavelength ultraviolet one, thereby improving the reliability of the identifications and the sensitivity of the quantification. It has been ensured that 2,4,6-trichlorophenol (TCP) and pentachlorophenol (PCP) not interfere in the determination. The leather fortifications of 30 and 300 mg/kg yielded average TCMTB recoveries of 94% and 99%, respectively. The recoveries of the other fungicides were similar. The targeted fungicides were determined in 40 samples of commercial leather. Residues of TCMTB were found in 90% of samples. In summary, the new ISO 13365:2011 Standard provides a quick and reliable method not only for the determination of the four molecules that are within the scope of the Standard but also for other fungicides such as IPBC and MBT. Note de contenu : - EXPERIMENTAL : Instrumentation - Materials - Samples - Procedures
- RESULTS AND DISCUSSION : Limits of detection and quantification - Linearity, recovery and precision - Selection of wavelength of detection - Analysis of commercial samplesEn ligne : https://drive.google.com/file/d/19XjQ5s3y5T5kEoC4Y9iPRhX1M6Hvfu-4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12523
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 11 (11/2011) . - p. 341-348[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 13434 - Périodique Bibliothèque principale Documentaires Disponible Development of a headspace-solid phase micro extraction method for the analysis of volatile and semi-volatile organic compounds from polyurethane resins for leather finishing / Antonia Flores in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 8 (08/2021)
[article]
Titre : Development of a headspace-solid phase micro extraction method for the analysis of volatile and semi-volatile organic compounds from polyurethane resins for leather finishing Type de document : texte imprimé Auteurs : Antonia Flores, Auteur ; Silvia Sorolla, Auteur ; Concepcio Casas, Auteur ; Rosa M. Cuadros, Auteur ; Anna Bacardit, Auteur Année de publication : 2021 Article en page(s) : p. 290-297 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse quantitative (chimie)
Chromatographie en phase gazeuse
Composés organiques volatils -- Analyse
Cuirs et peaux -- Finition
Extraction (chimie)
Polyuréthanes
Spectrométrie de masseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Volatile organic compounds (VOCs) and Semi-Volatile Organic Compounds (SVOCs) arise from the chemicals used in the various stages of the leather manufacturing process. An important aim of the tanning industry is to minimize or eliminate VOCs and SVOCs, without lowering the quality of leather.
This paper shows the development of a new headspace-solid phase micro extraction coupled with gas chromatography–mass spectrometry (HS-SPME/GC-MS) method for the identification of VOCs and SVOCs emitted by newly designed polymers for the leather finishing operation. These new polymers are polyurethane resins designed to reduce the VOC and SVOC concentration. This method enables a simple and fast determination of the qualitative and semi-quantitative content of VOCs and SVOCs in polyurethane-type finishing resins. The chemicals that are of concern in this paper are the following: Dipropylene glycol Monomethyl Ether (DPGME), DBE-3 (a mixture of dibasic esters) and Triethylamine (TEA). The test conditions that have been determined to carry out the HS-SPME assay are the following: incubation time (2 hours), extraction temperature and time (40°C; 5 minutes) and the desorption conditions (280°C, 50 seconds).
Ten samples of laboratory scale resins were tested by HS-SPME followed by gas chromatography (GC-MS). DPGME and DBE-3 (a mixture of dimethyl adipate, dimethyl glutarate and dimethyl succinate) have been identified effectively. The compounds are identified by a quantitative method using external calibration curves for the target compounds. The technique is not effective to determine the TEA compound, since the chromatograms shown poor resolution peaks for the standard.Note de contenu : - EXPERIMENTAL : Chemicals and reagents - Chromatography - HS-SPME method
- OPTIMIZING THE HS-SPME/GC-MS TEST CONDITIONS : SPME fiber - Sample stirring - Sample preparation - Time exposure - Extraction conditions - Desorption and fiber reconditioning
- RESULTS : HS-SPME/GC-MS optimized method for VOV and SVOC determination - Analytical calibration and quantification
- Table 1 : Relation between the incubation time and eluted area for DPGME isomers
- Table 2 : Extraction time and eluted area for DPGME isomers
- Table 3 : Extraction temperature and eluted area for DPGME isomers
- Table 4 : Desorption temperature and eluted area for DPGME isomers
- Table 5 : Desorption time and eluted area for DPGME isomers
- Table 6 : Optimised conditions for the HS-SPME assay of polyurethane resins
- Table 7 : Identification of VOC compounds from NV004 by HS-SPME/GC-MS
- Table 8 : Calibration curves by external standard from the four target compounds
- Table 9 : Concentration of the target compounds in the resin samples by HS-SPME/GC-MSDOI : https://doi.org/10.34314/jalca.v116i8.4362 En ligne : https://drive.google.com/file/d/19a2FgbbF0GGCcFeDZvxeHmaljBNBVe1f/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36086
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 8 (08/2021) . - p. 290-297[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22875 - Périodique Bibliothèque principale Documentaires Disponible Development of micro-nanocomposites with antibacterial effect for leather and textile / Anna Bacardit in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 7 (07/2016)
[article]
Titre : Development of micro-nanocomposites with antibacterial effect for leather and textile Type de document : texte imprimé Auteurs : Anna Bacardit, Auteur ; Concepcio Casas, Auteur ; Jordi Bou, Auteur ; Lluis Ollé, Auteur Année de publication : 2016 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens
Argent
Caractérisation
Cuirs et peaux -- Conservation
Encapsulation
Huiles et graisses végétales
Nanoparticules
Polymères
Revêtements
Textiles et tissus à usages techniquesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The aim of this work was to develop new systems of micro/nanocomposites to confer new functions to materials used for seats of public vehicles and public spaces. Specifically, this study focuses on antibacterial effect for leather and technical textile substrates.
The first stage of the research consists of a selection of micro/micro/nanomaterials and active principles: selection and evaluation of micro/nanoparticles, antibacterial and antifungal substances. In the second stage, the process of encapsulation of active principles was studied. The research includes optimization of the encapsulation process by improving the size and stability of the capsules. In addition, the synthesis of a hybrid organic-inorganic polymer acting as a micro/micro/nanomaterial carrier was developed.
To understand the mechanisms of synthesis and action of micro/micro/nanomaterials, characterization techniques have been used: scanning electron microscopy SEM and optical microscopy, analysis and distribution of particle size (DLS, Zetasizer). Regarding the antibacterial and antifungal ability of micro/nanocomposites, we adapted standard ASTM 2180-07 "Test methods for determining the activity or incorporated antimicrobial agent (s) in polymeric or hydrophobic materials."
Different products have been developed and the results obtained allow us to conclude that the synthesized products showed inhibition to the growth of bacteria and fungi on the contact surface.Note de contenu : - EXPERIMENTAL : Reagents - Characterization of the products obtained
- RESULTS : Encapsulation of natural oils of antibacterial effect - Synthesis of coatings with polymers incorporating reactants with known antibacterial effects in their structure - Synthesis of coatings with silver particles - Characterization of the selected compounds - Bactericidal and fungicidal capacity of the selected compoundsEn ligne : https://drive.google.com/file/d/1jbqgQWk9lSXQCavzQ6FD1VT6SCfpsPBj/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26717
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 7 (07/2016)[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 18213 - Périodique Bibliothèque principale Documentaires Disponible Development of nanocomposites with flame retardant effect for leather and fabric / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 4 (07-08/2019)
PermalinkDevelopment of nanocomposites with self-cleaning properties for textile and leather / Concepcio Casas in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 1 (01-02/2018)
PermalinkDevelopment of a new leather intermediate : wet-bright with a high dye affinity / Anna Bacardit in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 3 (03/2016)
PermalinkEffect of temperature, relative humidity and UV radiation on wet-bright leather ageing / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 5 (09-10/2017)
PermalinkEffect of ultrasound on several chromium tanning parameters / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 5 (05/2010)
PermalinkEffect of ultrasound on watery dissolutions of vegetable extracts used in leather tanning / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 4 (04/2008)
PermalinkEnvironmental assessment of dehydration processes for bovine leather / Grau Baquero in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 3 (03/2017)
PermalinkEpoxy resin cross-linked binders in aqueous finishing / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 1 (01-02/2010)
PermalinkHumic acid derivatives as tanning and retanning agents / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 2 (03-04/2012)
PermalinkLow carbon products for the design of innovative leather processes. Part I : Determination of the optimal chemical modification of tara / Anna Bacardit in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 10 (10/2013)
PermalinkLow carbon products to design innovative leather processes. Part II : Determination of the optimal physical modification of tara / Lluis Ollé in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 1 (01/2014)
PermalinkLow carbon products to design innovative leather processes. Part III : optimization of an eco-friendly formulation using tara / Anna Bacardit in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 9 (09/2015)
PermalinkLow carbon products to design innovative leather processes. Part IV : Manufacture of automotive leather using tara / Lluis Ollé in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 5 (05/2016)
PermalinkLower pollution pickle-chrome process : a no-float / low-salt approach / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 2 (03-04/2009)
PermalinkMinimisation of volatile organics in a metallic foil patent finish for uppers and leather goods / Lluis Ollé in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 3 (05-06/2009)
Permalink