Yazar "Fisher, Andrew" için listeleme
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Chemometric evaluation of trace metal concentrations in some nuts and see
Kafaoğlu, Burcu; Fisher, Andrew; Hill, Steve; Fisher Kara, Derya (Taylor & Francis Ltd, 2014)Seventeen trace metals in acid digests of nuts and seeds were determined using inductively coupled plasma-atomic emission spectrometry and inductively coupled plasma-mass spectrometry. The data were subjected to chemometric ... -
Comparison of some newly synthesized chemically modified Amberlite XAD-4 resins for the preconcentration and determination of trace elements by flow injection inductively coupled plasma-mass spectrometry (ICP-MS)
Kara, Derya; Fisher, Andrew; Hill, Steve J. (Royal Soc Chemistry, 2006)XAD copolymer resins may be functionalized with heavy metal ion-selective ligands either by covalent linkage to the polymer backbone or by impregnation. These resins may be tailored to be specific for certain heavy metals ... -
Detergent less ultrasound-assisted extraction of trace elements from edible oils using lipase as an extractant
Kara, Derya; Fisher, Andrew; Hill, Steve (Elsevier Science BV, 2015)A new method for the extraction and preconcentration of trace elements (Al, Ba, Cd, Cu, Fe, Mn, Mo, Ni, Ti, V and Zn) from edible oils by producing detergentless micro-emulsions via an ultrasound-assisted extraction using ... -
Determination and evaluation of element bioaccessibility in some nuts and seeds by in-vitro gastro-intestinal method
Kafaoğlu, Burcu; Fisher, Andrew; Hill, Steve; Kara, Derya (Determination and evaluation of element bioaccessibility in some nuts and seeds by in-vitro gastro-intestinal method, 2016)Element bioaccessibility in some nuts and seeds has been determined by performing a physiologically based extraction test. Nine elements (B, Ca, Co, Cu, Fe, Mn, Mg, Ni and Zn) in gastric and intestinal phase extractions ... -
Determination of gallium at trace levels using a spectrofluorimetric method in synthetic u-ga and ga-as solutions
Kara, Derya; Fisher, Andrew; Foulkes, Mike; Hill, Steve J. (Pergamon-Elsevier Science Ltd, 2010)A simple, easy to use and selective spectrofluorimetric method for the determination of trace levels of gallium has been developed. A new Schiff base, N-o-vanillidine-2-amino-p-cresol (OVAC) was synthesized and its ... -
Determination of rare earth elements in natural water samples - A review of sample separation, preconcentration and direct methodologies
Fisher, Andrew; Kara, Derya (Elsevier Science Bv, 2016)This review discusses and compares the methods given for the determination of rare earth elements (REE) in natural water samples, including sea, river, lake, tap, ground and waste waters as well as Antarctic ice. Since REE ... -
Determination of rare earth elements in seawater by inductively coupled plasma mass spectrometry with off-line column preconcentration using 2,6-diacetylpyridine functionalized Amber lite XAD-4
Karadaş, Cennet; Kara, Derya; Fisher, Andrew (Elsevier Science Bv, 2011)An off-line column preconcentration technique using a micro-column of 2,6 diacetylpyridine functionalized Amberlite XAD-4 with inductively coupled plasma mass spectrometry (ICP-MS) as a means of detection has been developed. ... -
Determination of trace heavy metals in soil and sediments by atomic spectrometry following preconcentration with schiff bases on amberlite xad-4
Kara, Derya; Fisher, Andrew; Hill, Steve J. (Elsevier Science Bv, 2009)A matrix separation and analyte preconcentration system using Amberlite XAD copolymer resins functionalized by Schiff base reactions coupled with atomic spectrometry has been developed. Three different functionalized ... -
The effects of gastric juice acidity on bioaccessibility of some elements in selected foods
Karadaş, Cennet; Fisher, Andrew; Kara, Derya (Academic Press Inc Elsevier Science, 2020)The pH value of gastric juice changes between 1.5 and 3.5 in healthy people but the upper pH range can be as higher as 7 in the presence of a gastric ulcer or different gastric cancers. The effects of the acidity of gastric ... -
Extraction of trace elements by ultrasound-assisted emulsification from edible oils producing detergentless microemulsions
Kara, Derya; Fisher, Andrew; Hill, Steve (Elsevier Sci Ltd, 2015)The aim of this study is to develop a new method for the extraction and preconcentration of trace elements from edible oils via an ultrasound-assisted extraction using ethylenediaminetetraacetic acid (EDTA) producing ... -
Flow injection determination of aluminium by spectrofluorimetric detection after complexation with N-o-vanillidine-2-amino-p-cresol: The application to natural waters
Kara, Derya; Fisher, Andrew; Hill, Steve J. (Elsevier Science Bv, 2008)An on-line flow injection spectrofluorimetric method for the direct determination of aluminium in water samples is described. The method is based on the reaction of aluminium with N-o-vanillidine-2-amino-p-cresol (OVAC) ... -
Modified silica gels and their use for the preconcentration of trace elements
Kara, Derya; Fisher, Andrew (Taylor & Francis İnc, 2012)This article presents the state-of-the-art of modified silica gels with different inorganic and organic chemicals and their use for the separation of trace elements from different sample matrices as well as their ... -
A novel ligandless-dispersive liquid-liquid microextraction method for matrix elimination and the preconcentration of rare earth elements from natural waters
Çelik, İbrahim; Kara, Derya; Karadaş, Cennet; Fisher, Andrew; Hill, Steve J. (Elsevier Science BV, 2015)A new, simple, efficient and rapid separation method based on ligandless-dispersive liquid-liquid microextraction (LL-DLLME) was developed for the preconcentration of rare earth elements (REEs) (La, Ce, Pr, Nd, Sm, Eu, Gd, ... -
Preconcentration and determination of trace elements with 2,6-diacetylpyridine functionalized Amberlite XAD-4 by flow injection and atomic spectroscopy
Kara, Derya; Fisher, Andrew; Hill, Steve (Royal Soc Chemistry, 2005)An on-line flow injection method for the direct determination of trace elements in environmental samples is described. A mini-column packed with 2,6-diacetylpyridine functionalized Amberlite XAD-4 was used to preconcentrate ... -
Preconcentration of heavy metals and matrix elimination using silica gel chemically modified with 2,3-dihydroxybenzaldehyde
Alan, Mesut; Kara, Derya; Fisher, Andrew (Taylor & Francis Inc, 2007)Many direct methods cannot easily be used to measure analytes such as Cd(II), Cu(II), Ni(II), Pb(II), and Zn(II) ions in sea and river water since these elements are present at very low concentration and the sample has a ...
