Waste Management

Analysis and fate of surfactants in the aquatic environment by Thomas P. Knepper, Pim de Voogt, Damia Barcelo

By Thomas P. Knepper, Pim de Voogt, Damia Barcelo

An realizing of the destiny and behavior of natural chemical substances, corresponding to surfactants, within the atmosphere is a prerequisite for the sustainable improvement of human health and wellbeing and ecosystems. As surfactants are being produced in large quantities, you will need to have a close wisdom approximately their lifetime within the surroundings, their biodegradability in wastewater therapy vegetation and in average waters, and their ecotoxicity. Parameters suitable for the evaluate of long term behaviour, similar to interactions with hormonal structures must be understood to prevent unforeseen hostile results to destiny generations of individuals and the surroundings. notwithstanding, the id and quantification of industrial surfactants within the atmosphere is made extra complex and bulky simply because they include of tens to hundreds and hundreds of homologues, oligomers and isomers of anionic, nonionic, cationic and amphoteric compounds.

The EU-funded PRISTINE venture (Priority surfactants and their poisonous metabolites in wastewater effluents: An built-in learn; ENV4-CT97-0494) offers the root for the content material of this identify. It presents coverage makers and with precise info on research and concentrations of surfactants and their degradation items within the environment.

In addition to a common advent to surfactants, this e-book includes a entire number of analytical recommendations, together with pattern dealing with, for the research of surfactants within the aquatic surroundings. Readers will locate the entire valuable details for interpreting different teams of surfactants, with precise emphasis on transformation items. caliber coverage can also be mentioned on intimately. Chapters on toxicity and chance overview also are incorporated and provides an entire standpoint at the surfactants challenge within the aquatic surroundings.

· provides the discovering of EU-funded learn into destiny and behavior of natural chemical compounds within the environment
· includes a accomplished number of analytical strategies, together with pattern dealing with, for the research of surfactants within the aquatic environment
· offers appropriate info to all teams operating within the box of surfactants

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The necessary volatilisation without thermal decomposition can be achieved by derivatisation of the analytes, but these manipulations are time- and manpower-consuming and can be susceptible to discrimination. Additionally, each derivatisation step in environmental analysis is normally target-directed to produce volatile derivatives of the compounds to be determined. Unknown surfactants that are simultaneously present, but differ in structure and therefore cannot react with the derivatisation reagent, are discriminated under these conditions.

The most appropriate procedure for the analysis of surfactants and their metabolites is, by far, HPLC. A major advantage of this technique is its ability to separate single components of complex surfactant mixtures. The use of optical detection systems like UV or fluorescence (FL) detection is only feasible when the molecule contains a chromophore. The lack of such a group can be compensated for if a mass spectrometer is coupled to the liquid chromatographic separation unit. Furthermore, this detector can be a very valuable tool in assigning a definitive identity to a chromatographic peak with relatively high sensitivity.

G. FID, UV, diode array detection (UV-DAD), FL, refractory index (RI), light scattering detector (LSD) or conductivity, applied in combination with GC, LC or CZE, is that they only provide an electric signal at the detector. The retention time alone of standard compounds, if available, is not sufficient for a reliable identification. LC separation of surfactantcontaining extracts may often result in non-reproducible retention 35 behaviour and only in those cases where substance-specific detection methods, like mass spectrometry (MS), are applied will this be evident.

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