Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

2 Ars Separatoria Acta

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: HPLC-ESI-MS

Sortuj według:

Ogranicz wyniki do:

Improved sensitivity of HPLC-ESI/MS analysis of the of biodegradation products of alkyl ethoxylates and alkylphenol ethoxylates by post-column lithium addition

100%

Matuszak M. , Ostrowski W. , Frański R.

tom No. 8

25-37

Biodegradation of nonylphenol ethoxylates and dodecyl ethoxylates (C9H19-C6H4- -(OCH2CH2)n-OH and C12H25-(OCH2CH2)n-OH respectively) in river water in a static die-away test was performed. By using high performance liquid chromatography with electrospray ionization mass spectrometric detection (HPLC-ESI/MS), surfactants containing 2-4 ethoxylene units were detected as biodegradation products. Post-column addition of a number of metal cation was tested in order to improve the sensitivity of HPLC-ESI/MS analysis. Among the metal cations taken into account, the use of a lithium cation gave the best results provided that the cone voltage was increased to 40-50 V.

Biodegradation of alkyl ethoxylates and alkylphenol ethoxylates in river water in a static die-away test as studied by HPLC-ESI/MS

100%

Zembrzuska J. , Frańska M. , Schroeder G. , Frański R.

tom No. 7

69-76

Biodegradation of nonylphenol ethoxylates and dodecyl ethoxylates (C9H19-C6H4- (OCH2CH2)n-OH and C12H25-(OCH2CH2)n-OH, respectively) in river water in a static die-away test was analyzed by using high performance liquid chromatography with mass spectrometric detection using the Applied Biosystems quadrupole-linear ion trap mass spectrometer Model 4000 QTrap. Surfactants containing 2-4 ethoxylene units may be regarded as persistent metabolites of longer surfactants. Homologues C9H19-C6H4- (OCH2CH2)5-OH and C12H25-(OCH2CH2)5-OH underwent substantial biodegradation till the 9th day of the test, their further biodegradation proceeded very slowly. The longer homologues (n > 5) were fully biodegraded during the test. Although the biodegradation of the surfactants studied consisted in shortening the ethoxylene chain (hydrophilic part), it was found that the hydrophobic part also affected their biodegradation.