Zobrazeno 1 - 10
of 327
pro vyhledávání: '"James S. Fritz"'
Publikováno v:
Journal of Chromatography A. 1118:62-67
There is an increasing need to know the concentrations of chromium(III) and (VI) separately rather than only the total chromium content. A method is described for accomplishing this very quickly using only low-cost, portable equipment. Two small, res
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::866958e7103b9846548f1428bd85c3f9
https://doi.org/10.1016/j.chroma.2006.01.117
https://doi.org/10.1016/j.chroma.2006.01.117
Publikováno v:
Analytica Chimica Acta. 558:230-236
Colorimetric solid-phase extraction (C-SPE) is an integrated technique in which an analyte is selectively concentrated onto a disk and then quantitated by diffuse reflectance spectroscopy. This paper describes the results of an investigation that app
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68b1bc15111d2bab967130f44d9857dd
https://doi.org/10.1016/j.aca.2005.11.014
https://doi.org/10.1016/j.aca.2005.11.014
Publikováno v:
Journal of Chromatography A. 1039:227-233
At concentrations of 100 mM or higher the chemical nature of both the cation and anion in the background electrolyte (BGE) can be varied to manipulate the migration times of protonated aniline cations. Significant differences were noted with Li+, Na+
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2d025a9d5d5c463f4fbef8f50e2bd13
https://doi.org/10.1016/j.chroma.2004.03.024
https://doi.org/10.1016/j.chroma.2004.03.024
Publikováno v:
Analytica Chimica Acta. 510:241-247
Colorimetric solid-phase extraction (C-SPE) has been previously explored as a means to monitor the iodine-based disinfectant used in the water systems on board the space shuttle. This same disinfectant is baselined for eventual deployment in the US w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::42f984cd4038d3e65d7a29c1dc39ff34
https://doi.org/10.1016/j.aca.2004.01.010
https://doi.org/10.1016/j.aca.2004.01.010
Publikováno v:
Analytica Chimica Acta. 508:53-59
Colorimetric solid phase extraction (C-SPE) is an analytical technique in which analytes in water samples are extracted onto a solid adsorbent matrix impregnated with a colorimetric reagent and then quantified directly on the adsorbent surface using
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::72d2707715498fcc40b1db8bad7ed2d4
https://doi.org/10.1016/j.aca.2003.11.044
https://doi.org/10.1016/j.aca.2003.11.044
Publikováno v:
Journal of Chromatography A. 1020:259-264
Inorganic and organic anions can be separated on an ordinary silica C18 column using a mobile phase containing tetrabutylammonium hydroxide (TBAH) and an aminosulfonic acid zwitterion reagent (MOPS). The pH of this eluent is close to 7 and the backgr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d8056b45ba1e70d3b39f7e12888b76d2
https://doi.org/10.1016/j.chroma.2003.08.009
https://doi.org/10.1016/j.chroma.2003.08.009
Autor:
Wenzhi Hu, James S. Fritz, Murad I. H. Helaleh, Mikaru Ikedo, Qun Xu, Hiroshi Taoda, Kiyoshi Hasebe, Paul R. Haddad, Masanobu Mori, Kazuhiko Tanaka
Publikováno v:
Journal of Chromatography A. 997:127-132
In this study, an aqueous solution consisting of benzoic acid with low background conductivity and beta-cyclodextrin (beta-CD) of hydrophilic nature and the inclusion effect to benzoic acid were used as eluent for the ion-exclusion chromatographic se
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c71ee23209b9023ecb5818769c44de5
https://doi.org/10.1016/s0021-9673(03)00545-4
https://doi.org/10.1016/s0021-9673(03)00545-4
Autor:
James S. Fritz
Publikováno v:
ELECTROPHORESIS. 24:1530-1536
Although nonionic compounds can be separated by micellar electrokinetic chromatography (MEKC), application of this technique is restricted by a somewhat limited elution range. Incorporation of organic solvents in the background electrolyte (BGE) grea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f6dbf56e228db64f91a5c9925e93fb34
https://doi.org/10.1002/elps.200305397
https://doi.org/10.1002/elps.200305397
Rapid, low level determination of silver(I) in drinking water by colorimetric–solid-phase extraction
Publikováno v:
Analytica Chimica Acta. 482:197-207
A rapid, highly sensitive two-step procedure for the trace analysis of silver(I) is described. The method is based on: (1) the solid-phase extraction (SPE) of silver(I) from a water sample onto a disk impregnated with a silver-selective colorimetric
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d78dfbef2da61e500374eefd57b8de44
https://doi.org/10.1016/s0003-2670(03)00173-9
https://doi.org/10.1016/s0003-2670(03)00173-9
Publikováno v:
Journal of Chromatography A. 985:359-365
Columns suitable for use in anion chromatography can be prepared by coating a packed reversed-phase HPLC column (C18 silica or polystyrene particles) with a cationic surfactant. The efficiency is improved dramatically by first coating the column with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::263f7687d01f19419739434649422bea
https://doi.org/10.1016/s0021-9673(02)01419-x
https://doi.org/10.1016/s0021-9673(02)01419-x