Figate
发表于 2025-3-23 11:50:52
Applications in Gas ChromatographyThese notes describe solutions to some practical problems in gas chromatography. The first note concerns the use of a second detector to monitor internal standards, while the second describes a flow-controlled effluent splitter for use with relatively large concentrations of trihalomethanes from a purge and trap system.
ostrish
发表于 2025-3-23 16:38:33
The Determination of Linear PTGC Retention Indices for Use in Environmental Organics AnalysisThe availability of mass spectra is not always sufficient for the identification of environmental organic pollutants. Often GC retention data are useful to remove ambiguities.
graphy
发表于 2025-3-23 21:14:35
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EXPEL
发表于 2025-3-23 22:23:48
https://doi.org/10.1057/9781137445520 these projects, the COST 64b-bis is directed towards the study of “Organic micropollutants in water”. This is a subject which has attracted large interest both among the member countries, as well as many non-member countries. However, when we look at the different problems and research interests in
esculent
发表于 2025-3-24 04:07:07
https://doi.org/10.1057/9781137445520are treated with such aspects as sensitivity, selectivity and convenience. Various small-volume sampling methods are exemplified for predetermined compounds. Results from comparative studies of different standard methods are shortly reviewed. Continuous automatic sampling by solvent extraction and b
Receive
发表于 2025-3-24 08:25:01
https://doi.org/10.1057/9781137445520 ppb level. A micro gas-phase extractor advantageously replaces other preconcentration and purification techniques. The extract is analysed by capillary gas chromatography without further enrichment. The recovery at the ppb level was nearly 100% for organochlorine pesticides and more than 80% for PC
obeisance
发表于 2025-3-24 12:03:40
https://doi.org/10.1007/978-3-030-85931-2tile compounds)..After choosing a list of organic compounds and chemical classes which acute or chronic toxicity is well known, an analytical scheme is presented to analyse 13 classes..After a first clean up, the total extract is separated in three fractions (acid, base and neutral). Each one is tes
Subdue
发表于 2025-3-24 14:51:15
https://doi.org/10.1007/978-3-030-85931-2ted. The feasibility of a liquid/liquid extraction method and a resin (XAD-2) adsorption method for analysing these pollutants in humus water has also been investigated. The influence of the aquatic humus on the organic pollutants was found to vary considerably between different classes of compounds
Increment
发表于 2025-3-24 21:39:54
‘Around-the-Table’ Negotiationsm cation frcm water and by elution of these species adsorbed on activated carbon are compared with values obtained in absence of ion-pairing effect..The addition of tetraphenylarsonium chloride promotes the extraction of dimethyl and diethyl dithiophosphates from aqueous solutions while the elution
眉毛
发表于 2025-3-25 00:36:04
Michel Rudnianski,Hélène Bestougeffis suggested to use FID and ECD fingerprint methods. These methods are relatively simple and consist of concentrating the organic matter either with solvents or with XAD-2 resin. After evaporating the solvent to a small volume, the sample is analysed by means of gas chromatography. By using several