APCI biodegradation

When an industrial blend of C13-AE surfactants CraH2ra+iO-(CH2-CH2-0) H was biodegraded with different biocoenoses in lab scale reactors, different degradation pathways were observed applying biocoenoses of different WWTPs. Besides a mixture of precursor compounds reduced in concentration, metabolites were also observed by APCI and ESI-MS(+) as [M + NH4]+ ions, which were then confirmed by MS-MS. The AE blend CnH2n+10-(CH2-CH2-0) H (.n = 13 x = 1-16) with equally spaced ions (Am/z 44) at m/z 262, 306,... 

A PPG biodegradation product as metabolite of PPG generated by metabolisation of AP could be observed and verified by MS-MS(+) when WWTP effluents were examined by APCI-FIA-MS(+) and selected compounds were identified by FIA-MS-MS(+). In the SPE effluent extracts, two ions at m/z 266 and 324 were observed, which... 

Despite the fact that physico-chemical and chemical degradations were not possible, the isolation of persistent metabolites of the CnF2n+i-(CH2-CH2-0)m-H compound generated by (3 and w oxidations of the terminal PEG unit of the non-ionic blend was reported, but environmental data about this type of compound are still quite rare [49]. TSI(+) ionisation results of the industrial blend Fluowet OTN have been reported in the literature [7,51]. Actual data of non-ionic fluorinated surfactants were applied using ESI- and APCI-FIA-MS(+) and -MS-MS(+), which reported the biodegradation of the non-ionic partly fluorinated alkyl ethoxylate compounds C F2 fi-(CH2-CH2-0)x-H in a lab-scale wastewater treatment process. 

Following previous studies on lauryl sulfate and AES, Cuzzola et al. [44] also studied the Fenton oxidation products of AEO and NPEO. The aerobic biodegradation of AEO and NPEO and anaerobic biodegradation of NPEO were studied by Schroder [27] by means of FIA-MS and LC-MS and MS-MS in positive-ion and/or negative-ion APCI. Methyl ethers of AEO ate persistent in aerobic conditions. NPEO degradation results in NPEC. Anaerobic biodegradation of NPEO results in nonylphenols. 

Yarita et al. developed an APCI-LC-MS(-i-/-) method to analyse diuron and li-nuron and their respective degradation products, l-(3,4-dichlorophenyl)urea and l-(3,4-dichlorophenyl)-3-methylurea before the method was then applied to foUow biodegradation of diuron in sewage sludge over a period of 28 d [380]. 

For the biodegradation of atrazine and " C-labeled atrazine by Rhizobium sp. strain APCI-LC-MS was used for qualitative foUow-up, for quantification, however,... 

Several review papers have reported on the application of ESI in the analysis of surfactants. Di Corcia reviewed LC-MS methods for the unequivocal identification of isomers, oligomers and homologues of the technical blends of surfactants and their biodegradation intermediates in environmental samples at trace levels with particular attention to ESI and TSP apphcations [40]. Qench et al. [28] described the applications of LC-MS in environmental analysis using the interfaces PBI, TSP, APCI and ESI in use or just coming into use in th early 1990s. 

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