Çevre Sorunları Araştırma Ve Uygulama Merkezi Müdürlüğü Koleksiyonu

Wild mushrooms from Ilgaz Mountain National Park (Western Black Sea, Turkey): element concentrations and their health risk assessment

2022-02-10T06:38:57Z

Wild mushrooms from Ilgaz Mountain National Park (Western Black Sea, Turkey): element concentrations and their health risk assessment Keskin, Feyyaz; Sarıkürkçü, Cengiz; Demirak, Ahmet; Akata, Ilgaz; Sıhoğlu Tepe, Arzuhan The purpose of this study was to determine Fe, Cd, Cr, Se, P, Cu, Mn, Zn, Al, Ca, Mg, and K contents of some edible (Chlorophyllum rhacodes, Clavariadelphus truncatus, Clitocybe nebularis, Hydnum repandum, Hygrophorus pudorinus, Infundibulicybe gibba, Lactarius deliciosus, L. piperatus, L. salmonicolor, Macrolepiota mastoidea, Russula grata, Suillus granulatus, and Tricholoma imbricatum), inedible (Amanita pantherina, Geastrum triplex, Gloeophyllum sepiarium, Hypholoma fasciculare, Phellinus vorax, Pholiota limonella, Russula anthracina, and Tapinella atrotomentosa), and poisonous mushroom species (Amanita pantherina and Hypholoma fasciculare) collected from Ilgaz Mountain National Park (Western Black Sea, Turkey). The element contents of the mushrooms were determined to be 18.0-1239.1, 0.2-4.6, 0.1-3.4, 0.2-3.2, 1.0-8.9, 3.3-59.9, 3.7-220.4, 21.3-154.1, 6.4-754.3, 15.8-17,473.0, 413.0-5943.0, and 2803.0-24,490.0 mg·kg-1, respectively. In addition to metal contents, the daily intakes of metal (DIM) and Health Risk Index (HRI) values of edible mushrooms were also calculated. Both DIM and HRI values of mushroom species except L. salmanicolor, M. mastoidea, and R. grata were within the legal limits. However, it was determined that the Fe content of L. salmanicolor and M. mastoidea and Cd content of R. grata were above the legal limits.

Determination of Selenium by Platinum-coated Tungsten Coil Trap Hydride Generation-Atomic Absorption Spectrometry

2021-06-24T08:07:39Z

Determination of Selenium by Platinum-coated Tungsten Coil Trap Hydride Generation-Atomic Absorption Spectrometry Yıldız, Dilek A highly sensitive analytical technique was developed in which gaseous hydrogen selenide generated by sodium tetrahydroborate reduction was transported and trapped on a resistively heated platinum-coated W-coil trap for in situ preconcentration. The selenium concentration was determined using hydride generation-atomic absorption spectrometry (HG-AAS). The surface of the W-coil was covered with platinum using the electrodeposition technique in the presence of H-2 and Ar. According to the results of Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy (SEM-EDX) images, the ratio of Pt was 54.74% on the W-coil trap surface. Various experimental conditions, such NaBH4 and hydrochloric acid concentration, and carrier gas flow rate, were optimized. In addition, the effect of the hydride-forming elements was quantitatively evaluated. The limit of detection for Se was 21.1 ng/L. The proposed method was also applied to the determination of selenium in certified reference material (SRM 1640a Trace Elements in Natural Water) which showed that the analysis could be performed with a relative error of about 8%. The precision of the method was evaluated and a relative standard deviation (%RSD) lower than 10% was obtained.

Effect of metal sensitizers on photochemical vapor generation of bismuth for analytical atomic spectrometry

2021-04-12T20:45:22Z

Effect of metal sensitizers on photochemical vapor generation of bismuth for analytical atomic spectrometry Vyhnanovsky, Jaromir; Yıldız, Dilek; Musil, Stanislav Conditions of photochemical vapor generation of bismuth were optimized in a flow-injection system with a standard mercury low-pressure tube lamp and a coiled reactor. A high-resolution continuum source atomic absorption spectrometer was used as a detector that was equipped with a miniature diffusion flame as an atomizer. The influence of flow rate of a carrier gas, irradiation time and composition of a reaction medium was investigated. Combination of 40% (v/v) acetic acid with 1.25% (v/v) formic acid was found optimal. Subsequently, the use of various metals as sensitizers was studied to achieve maximum generation efficiency. Except the already published positive effect of Fe2+, three new sensitizers were found, with the enhancement effect in the following order: Cu2+ < Cd2+ << Co2+. Interference from nitric acid which is commonly used for digestion of real samples was investigated. The limit of detection achieved with the optimal conditions was 5.9 mu g L-1. 15th International Students Conference on Modern Analytical Chemistry - SEP 19-20, 2019 - Prague, CZECH REPUBLIC; WOS: 000576787700042

Flame Atomic Absorption Determination of Copper in Environmental Water with Cloud Point Extraction using Isonitrosoacetophenone 2-aminobenzoylhydrazone

2021-04-12T20:45:17Z

Flame Atomic Absorption Determination of Copper in Environmental Water with Cloud Point Extraction using Isonitrosoacetophenone 2-aminobenzoylhydrazone Yıldız, Dilek; Demir, Mustafa A cloud point extraction method has been developed for preconcentration of Cu2+ ions. Tergitol 15-s-7 and Tergitol 15-s-9 are nonionic surfactants used to form micellar media. Taguchi method was used to optimize cloud point extraction conditions. Effects of foreign ions on the analyte recovery were also examined. Certified reference material (CRM 1640a) was used to demonstrate accuracy of results. All results showed a good agreement with the certified values. The proposed method was successfully applied for separation and preconcentration of Cu2+ ions from river water samples. The detection limits obtained were 10 and 14 ng/mL in case of using Tergitol 15-s-7 and Tergitol 15-s-9, respectively. WOS: 000469443400003