Suda Uçucu Aromatik Hidrokarbonların (UAH’lar) Hassas ve Doğru Analizi için Gaz Kromatografisi Yöntemi Doğrulama Çalışması

Güzel, Barış; Canlı, Oltan; Olgun, Elmas Öktem

doi:10.17776/csj.439764

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…The details of the chirality test results of limonene in different types of citrus oils in Türkiye by GC-MS are presented in Table 3. The results for total limonene content in relevant citrus oils were taken from previous work (19). R-limonene and S-limonene contents were calculated proportionally based on these results.…”

Section: Determination Of Chirality Of Limonene In Citrus Oilsmentioning

confidence: 99%

“…It involves separating the components of a sample based on their volatility and then detecting and quantifying them. GC coupled with a flame ionization detector (FID) or a mass spectrometer (MS) is commonly used for limonene analysis (19). (b) High-Performance Liquid Chromatography (HPLC): HPLC is another technique used for the analysis of limonene in citrus oils.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Limonene Chirality in Oils Obtained from Different Types of Citrus Waste Peels in Türkiye

Güzel,

Canlı,

Yüce

et al. 2024

Journal of the Turkish Chemical Society Section A: Chemistry

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Limonene constitutes a significant amount in citrus oils. It has a chiral structure and has two different optically active isomers, R-limonene and S-limonene, which are symmetrical to each other. Determining the chiral configurations of limonene plays an important role in determining the beneficial use areas of essential oils. Citrus oils are used in a wide variety of industrial areas, depending on their limonene content. This paper presents the analytical method optimization, validation, and chirality studies of limonene in the citrus oils acquired from different citrus waste peels in Türkiye. An inlet temperature of 250 °C and an injection volume of 2 µL were decided as the optimal conditions for the most accurate measurement of both limonenes in the citrus oil. This method produced results for linearity, sensitivity (LODs and LOQs), repeatability, and reproducibility that were acceptable within the scope of the validation studies. The chirality of limonene was investigated in twenty-six citrus oils (fifteen orange oils, six lemon oils, four mandarin oils, and one grapefruit oil) in Türkiye. While the content of R-limonene in orange oil varied between 56.39% and 72.85%, the content of S-limonene changed from 2.53% to 5.71%. Whereas the constituent of R-limonene in lemon oils ranged from 54.73% to 73.99%, the content of S-limonene varied between 3.78-4.79%. In mandarin oils, the content of R-limonene was determined to be 58.02% and 65.05%, while the content of S-limonene was found as 3.05% and 4.87%. In single grapefruit oil, R-limonene content was 60.69% and S-limonene content was 3.12%.

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Section: Determination Of Chirality Of Limonene In Citrus Oilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of Limonene Chirality in Oils Obtained from Different Types of Citrus Waste Peels in Türkiye

Güzel,

Canlı,

Yüce

et al. 2024

Journal of the Turkish Chemical Society Section A: Chemistry

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“…2). In the validation study, acceptable linearity of any substance is linear regression with a correlation coefficient better than 0.99 [15][16][17][18]. Fig.…”

Section: Selectivity Linearity and Sensitivity (Lod And Loq)mentioning

confidence: 99%

Determination of Ethylenediaminetetraacetic acid (EDTA) levels in surface waters by high performance liquid chromatography (HPLC)-Ultraviolet/Visible (UV/VIS) detector

Canlı

Güzel

Çetintürk

2022

Turkish Journal of Analytical Chemistry

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Ethylenediaminetetraacetic acid (EDTA) is a chemical that is harmful to human health with its high solubility in water, which is used as a metal chelating agent in industries such as medicine, food, personal care product, agriculture. Thus, it is necessary to should be monitored in surface waters taken from dams supplying drinking and utility water. This work presents the applicability of the HPLC-UV/VIS system for the quantification of EDTA in surface waters based on the limit values of national and international legislation such as the Turkish Regulation on the Management of Surface Water Quality. The applicability of EDTA quantification in surface water was checked with validation study. The method validation consisted of selectivity, calibration curve linearity, limit of detection (LOD) and limit of quantification (LOQ), accuracy (recovery), and precision. In selectivity study, no peaks belonging to interfering compounds that would cause false-positive results were found in the chromatograms at the retention time of EDTA (5.773 min.). The linearity of EDTA was obtained ranging from 10 µg/L to 200 µg/L concentrations with the correlation coefficient of 0.9985 and the calibration curve equation of y=4659.4x-50223. The LOD and LOQ values of EDTA was 2.85 µg/L and 9.51 µg/L with the RSD of 5.36. In accuracy, the mean recovery of EDTA in surface water has been determined as 87.51 percent with an RSD of 6.11. The repeatability (RSD, %) varied from 5.44 % to 7.02 % with concentrations of 35.19 ± 1.91 μg/L and 17.11 ± 1.20 μg/L, whereas the reproducibility (RSD, %) was obtained at 3.45 % with the concentration of 34.13 ± 1.18 μg/L. In this study, the presence of EDTA was investigated in approximately 300 surface water samples and EDTA was found as positive in the concentration range of 11.17 µg/L to 52.14 µg/L in eleven real samples.

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“…Sediman örnekleri laboratuvarda açılmış ve Teknosem marka liyofilizatör yardımıyla 1 gün boyunca kurutma [24][25][26][27] belirtildiği gibi kromatogramdaki ortalama gürültü değerinden gerçekleştirilmiştir. Tablo 4'e göre, PAH'lar için LOD ve LOQ değerleri sırasıyla 0,019-0,054 ng/g ve 0,064-0,181 ng/g aralıklarında gerçekleşmiştir.…”

Section: öRnek Hazırlama Ve Enstrümantal Analiz (Sample Preparation A...unclassified

Tekirdağ iline içme suyu sağlayan bazı baraj gölü/gölet yüzey sedimanlarında PAH, PCB ve OCP düzeylerinin belirlenmesi ve risk değerlendirmesi

Canlı

2022

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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 Analysis of PAHs, PCBs and pesticides by high precision GC-MS/MS.  The PAHs in the samples are mostly petrogenic  The levels of pollutants in the examples do not exceed ERM values.The purpose of this study was to determine the level of organic pollutants in the surface sediments of some dam lakes/ponds in Tekirdağ, to specifiy possible PAH sources and to perform the ecological risk assessment of sediment quality. Naphthalene is dominant PAH congener in all other sediment samples. In the samples, the most dominant OCP compounds were DDT p, p, DDE p, p and HCH alpha, respectively, while PCB 153, 138 and 180 were the highest detected PCB congeners. Source identification of PAHs was made using the molecular ratios of PAH compounds. Considering all the calculated molecular ratios together, it has been found that the source of PAH compounds in sediment samples is mostly petrogenic. None of the levels of PAHs, PCBs and OCPs in the samples exceeded the ERM values. Figure A. Sediment pollution and analysisPurpose: Determination of the levels of PAH, PCB and chlorinated pesticides in the surface sediments of some lakes/ponds in Tekirdağ was aimed in this study. The possible PAH sources based on the results obtained was also investigated. Theory and Methods:The freeze-dried sediment samples were extracted using an automatic extraction system. Cleanup was done by silica and alumina column chromatography and PAH congeners and PCB/chlorinated pesticide compounds were collected separately and cleaned samples were analyzed by GC-MSMS. Results:It was observed that none of the levels of PAHs, PCBs and OCPs in the samples exceeded the ERM values, which is the pollutant level at which toxic effects often occur in aquatic organisms. Conclusion:Source identification of PAHs was made using the molecular ratios of PAH compounds. Considering all the calculated molecular ratios together, it has been found that the source of PAH compounds in sediment samples is mostly petrogenic. None of the levels of PAHs, PCBs and OCPs in the samples exceeded the ERM values, which is the contaminant level at which toxic effects often occur in aquatic organisms.

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Suda Uçucu Aromatik Hidrokarbonların (UAH’lar) Hassas ve Doğru Analizi için Gaz Kromatografisi Yöntemi Doğrulama Çalışması

Cited by 7 publications

References 21 publications

Determination of Limonene Chirality in Oils Obtained from Different Types of Citrus Waste Peels in Türkiye

Determination of Limonene Chirality in Oils Obtained from Different Types of Citrus Waste Peels in Türkiye

Determination of Ethylenediaminetetraacetic acid (EDTA) levels in surface waters by high performance liquid chromatography (HPLC)-Ultraviolet/Visible (UV/VIS) detector

Tekirdağ iline içme suyu sağlayan bazı baraj gölü/gölet yüzey sedimanlarında PAH, PCB ve OCP düzeylerinin belirlenmesi ve risk değerlendirmesi

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