Browsing by Author "Gürkan R."
Now showing items 1-20 of 69
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Catalytic spectrophotometric determination of Mn(II) at trace levels using Celestine blue-KIO4-1,10-phenantroline redox reaction
Gürkan R. (2011)A new kinetic method has been developed for the measurement of Mn(II) in water samples. The method is based on the catalytic effect of Mn(II) with the oxidation of Celestine blue (CB+) by KIO4 using 1,10-phenantroline ... -
Catalytic spectrophotometric determination of trace Mo(VI) in milk-based beverages in the presence of bromophenol blue and H2O2 using SDS as a sensitizer
Temel N.K.; Gürkan R. (2016)A simple and low-cost catalytic spectrophotometric method using sodium dodecyl sulfate (SDS) as a sensitivity-improving surfactant to detect low levels of Mo(vi) in beverage matrices was developed. The method is based on ... -
Catalytic spectrophotometry for the determination of manganese at trace levels by a novel indicator reaction
A new kinetic spectrophotometric method is developed for the measurement of Mn(II) in natural water samples. The method is based on the catalytic effect of Mn(II) with the oxidation of Gallocyanin by KIO4 using nitrilotriacetic ... -
Catalytic-kinetic spectrophotometric determination of vanadium (V) based on the Celestine blue-bromate-vanadium (V)-citric acid reaction
A novel sensitive and relatively selective kinetic method is presented for the determination of V(V) based on its catalytic effect on the oxidation reaction of Celestine blue by potassium bromate in the presence of citric ... -
Cloud point extraction and spectrophotometric determination of mercury species at trace levels in environmental samples
Ulusoy H.B.; Gürkan R.; Ulusoy S. (2012)A new micelle-mediated separation and preconcentration method was developed for ultra-trace quantities of mercury ions prior to spectrophotometric determination. The method is based on cloud point extraction (CPE) of Hg(II) ... -
Cloud point extraction of trace cyanide from environmental waters for indirect flame atomic absorption spectrometric determination
A method has been developed for indirect determination of cyanide in environmental waters based on cloud point extraction (CPE), preconcentration and determination by flame atomic absorption spectrometry (FAAS). The method ... -
Combination of Ultrasonic-Assisted Cloud Point Extraction with Flame AAS for Preconcentration and Determination of Trace Amounts of Silver and Cadmium in Dried Nut and Vegetable Samples
Gürkan R.; Altunay N.; Yıldırım E. (2016)In this article, ultrasonic-assisted cloud point extraction (UA-CPE) was used to the preconcentration of trace Ag(I) and Cd(II) in dried nut and vegetable samples. After ion association of Ag(I) and Cd(II) ions with ... -
Combination of ultrasound-assisted cloud-point extraction with spectrophotometry for extraction, preconcentration, and determination of low levels of free formaldehyde from cosmetic products
Temel N.K.; Gürkan R. (AOAC International, 2018)In the present study, a new preconcentration method was developed to quantify the free formaldehyde (FA) in hair cosmetics by combining ultrasound-assisted cloud-point extraction with spectrophotometry. The method is based ... -
Determination of low levels of Cd(II) in cosmetic products by spectrophotometry after separation/preconcentration with cloud point extraction
Altunay N.; Gürkan R. (2016)In the present study, a simple, low-cost and efficient method was developed for the extraction and preconcentration of Cd(ii) from cosmetic products by using cloud point extraction (CPE) prior to spectrophotometric detection. ... -
Determination of low levels of molybdenum (VI) in food samples and beverages by cloud point extraction coupled with flame atomic absorption spectrometry
Gürkan R.; Aksoy T.; Ulusoy H.T.; Akçay M. (2013)Cloud point extraction (CPE) was used for the preconcentration of molybdenum (Mo), after the formation of a complex with Victoria pure blue BO (VPB+) in presence of excess thiocyanate and cetylpyridinium chloride (CPC) at ... -
Determination of sodium and potassium in certified rock samples by AES after ultrasonic leaching
Özkan M.H.; Özkan A.; Gürkan R.; Akçay M. (2006)In order to evaluate the data obtained by atomic emission spectrometric analysis after ultrasonic extraction, destructive analysis of some certified rock samples employing ultrasonic waves was applied to two elements, Na ... -
Determination of sub-ng g– 1 levels of total inorganic arsenic and selenium in foods by hydride-generation atomic absorption spectrometry after pre-concentration
Altunay N.; Gürkan R. (Taylor and Francis Ltd., 2017)A new and simple ultrasonic-assisted extraction (UAE) procedure was developed for the determination of inorganic arsenic and selenium in foods by hydride-generation atomic absorption spectrometry (HG-AAS). The various ... -
Determination of the surface properties of untreated and chemically treated kaolinites by inverse gas chromatography
Kubilay Ş.; Gürkan R.; Savran A.; Yalçinkaya Z. (2006)Inverse gas chromatography is used to study the surface properties of the untreated and chemically treated kaolinite samples. Changes in the enthalpy of adsorption for a variety of probes and in the surface energy of clays ... -
Determination of total Sn in some canned beverages by FAAS after separation and preconcentration
Gürkan R.; Altunay N. (2015)A micelle-mediated preconcentration method has been developed for determination of trace amounts of tin in canned beverage samples, which is widely used in food industry for packing, but its utilization is limited due to ... -
Determination of trace amounts of Cu(II) in drinking and wastewater samples by a novel catalytic kinetic spectrophotometric method
Gürkan R.; Ulusoy H.I.; Dönmez M. (2012)The current method is based on the catalytic effect of Cu(II) on the oxidation of xylidyl blue (XB) by hydrogen peroxide (H 2O 2) in pH 10.5 borate buffer medium. The reaction was monitored spectrophotometrically by measuring ... -
Determination of trace cadmium in nonalcoholic beverages by coupling cloud point extraction with spectrophotometry
Gürkan R.; Altunay N. (2013)A cloud-point extraction (CPE) process using the nonionic surfactant, Triton X-114 to extract Cd(II) ions from aqueous solutions was investigated. The method is based on the ion-pairing reaction of Cd(II) with Victoria ... -
Determination of ultra trace arsenic species in water samples by hydride generation atomic absorption spectrometry after cloud point extraction
Ulusoy H.T.; Akçay M.; Ulusoy S.; Gürkan R. (2011)Cloud point extraction (CPE) methodology has successfully been employed for the preconcentration of ultra-trace arsenic species in aqueous samples prior to hydride generation atomic absorption spectrometry (HGAAS). As(III) ... -
Development of a cloud point extraction and preconcentration method for chromium(III) and total chromium prior to flame atomic absorption spectrometry
Ulusoy H.I.; Gürkan R.; YIlmaz Ö.; Akçay M. (2012)A sensitive and selective method has been developed for the determination of chromium in water samples based on using cloud point extraction (CPE) preconcentration and determination by flame atomic absorption spectrometry ... -
Development of a cloud point extraction and preconcentration method for determination of trace aluminum in mineral waters by FAAS
Ulusoy H.I.; Gürkan R.; Aksoy Ü.; Akçay M. (2011)A cloud point extraction (CPE) method has been developed for the preconcentration of trace aluminum prior to its determination by flame atomic absorption spectrometry (FAAS). The CPE method is based on the complex of Al(III) ... -
Development of a new analytical method for Pb preconcentration and its further determination in water and foodstuffs using relatively low-sensitivity flame atomic absorption spectrometry
Gürkan R. (Taylor and Francis Ltd., 2019)The present study describes chelation of Pb(II) with ascorbic acid and formation of a charge-transfer sensitive ion-pair in the presence of Rhodamine 6G at pH 5.5, and then its extraction to the micellar phase of non-ionic ...
