Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 5

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  derivatization
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1

Analysis of PPB amounts of aldehydes in water by solid phase extraction

100%
Nawrocki J., Kalkowska I., Dabrowska A.
Polish Journal of Environmental Studies
|
1996
|
tom 05
|
nr 3
Ozonation is commonly used in drinking water treatment technology. Ozone reacts with natural organic substances present in water to produce a number of by-products. Aldehydes are the important class of ozonation by-products due to their health effects. The determination of aldehydes in water by conventional analytical techniques is difficult because they are polar, unstable and exist at low concentration. A modern method to determine aldehydes in drinking water applies derivatization with 0-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine (PFBOA) and liquid-liquid extraction (LLE). The objective of this study was to improve the method by applying solid phase derivatization and extraction. C18 Baker SPE sorbents were used for simultaneous derivatization and enrichment of aldehydes. Detection limits with GC/ECD technique were in the low ppb range.
2

A highly efficient method for derivatization of fatty acids for high performance liquid chromatography

86%
Czauderna M., Kowalczyk J., Niedzwiedzka K. M., Wasowska I.
Journal of Animal and Feed Sciences
|
2002
|
tom 11
|
nr 3
3

Screening of alkanocarboxylic and phenolic herbicides in water samples by means of derivatization-based gas chromatography

86%
Rompa M., Kremer E., Zygmunt B.
Polish Journal of Environmental Studies
|
2005
|
tom 14
|
nr 1
This work presents a method of screening of alkanophenoxy carboxylic (2,4-D, 2,4,5-T, MCPA, MCPP) and phenolic (dinoterb, dinoseb, pentachlorophenol) herbicides in water. The successive steps of the method, i.e. liquid-liquid extraction with ethyl acetate and methyl-tert-butyl ether and solid phase extraction using C18-modified silica gel and styrenedivinylbenzene copolymer-packed cartridges as well as an ininjection port derivatization with trimethyl phenylammonium hydroxide, were tested. The conditions of GC-FID and GC-MS analysis were optimized. The method developed was applied to determine selected herbicides in surface waters in the Gdańsk region.
4

An improved method for derivatization of fatty acids for liquid chromatography

86%
Czauderna M., Kowalczyk J., Chojecki G.
Journal of Animal and Feed Sciences. Supplement
|
2001
|
tom 10
|
nr 2
5

Speciation of organometallic compounds of tin, lead, and mercury

86%
Wasik A., Namiesnik J.
Polish Journal of Environmental Studies
|
2001
|
tom 10
|
nr 6
This paper presents a discussion of fundamental problems of the speciation analytics of organometallic compounds occurring at low concentration levels in samples involving a complex matrix. It points out differences in analytical procedures for speciation analyses and those for determinations of total contents of a metal present in the studied sample in a number of different species.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.