Tìm thấy 16+ kết quả cho từ khóa "Real samples"
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Application of a pencil graphite electrode for voltammetric simultaneous determination of ascorbic acid, norepinephrine, and uric acid in real samples. The anodic peaks of AA, NE, and UA in their mixture can be well separated in 0.1 M Britton–Robinson buffer solution at pH 4.0. Under optimum conditions, linear calibration graphs were obtained from the AA, NE, and UA concentration ranges, which were 100–800 nM, 20–170 nM, and 40–175 nM, respectively.
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However, there is no information about application of the method in real samples. Therefore, a validated voltammetric method for determination of zineb in real samples seemed necessary.
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The method was also applied to real water samples (tap water, seawater) and a soil sample for addition and recoveries. Application of the proposed method to real samples for addition recoveries, pH: 10, volume of the sample: 15 mL, final volume: 1.5 mL, volume of THF: 0.3 mL, volume of extraction solution: 0.4 mL (N = 3).. A novel SsLLME method for preconcentration of U(VI) for water and soil samples was established prior to its determination by UV-Vis spectrophotometry.
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These results show that the method is valid and therefore could be used with real environmental samples to separate, preconcentrate, and determine trace quantities of Cd 2+ and Pb 2+ in real samples.. The results for the addition-recovery tests for Cd 2+ and Pb 2+ ions in water samples using the proposed SPE method (N = 3)..
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This liquid phase microextraction method developed has been verified by applying recovery studies to two different water samples and one food sample (Table 2). In this context, firstly, the method was applied directly to the real samples, then the recovery efficiency values in the real sample matrix were examined by adding certain concentrations.
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The recommended method was applied to real samples for the preconcentration of Al(III). Before the SPE procedure, the pH of the sample was adjusted to the desired value. This may be attributed to the reusability of the same functional structure towards the targeted metal ion.
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Analyte levels in real liquid samples after treatment with the proposed SPE procedure (N = 3 and final volumes: 2.0 mL).. Analyte levels in real solid samples ( µ g g − 1 ) after treatment with the proposed SPE procedure (N = 3 and final volumes: 2.0 mL).. Comparison of the developed procedures with some recent studies based on SPE reported in the literature..
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The experimental results shown in Table 1 indicates that this magnetic solid phase extraction method can be used to determine Pb(II) and Cu(II) accurately in the different type of real samples without matrix effects.. Some analytical characteristics of the proposed method including preconcentration factor, limit of detection, and limit of quantification were listed in Table 2.
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This behavior enables boric acid to be de- termined in the samples. To the best of our knowledge, there is no study on the determination of boron in any real samples using a disposable pencil graphite electrode.. The aim of the present work was to optimize and characterize a voltammetric procedure using a disposable PGE for boron determination in real samples. Voltammetric behavior of boron–Tiron complex at the pencil graphite electrode.
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The tests of addition/recovery in the experiments for analyte ions were performed for dam water and fertilizer samples (Table 5). of certified reference material and addition/recovery tests show that the proposed method was helpful for the determination of lead, cobalt, and nickel in real samples with complicated matrices..
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Application of the ATPS method to real samples. The developed ionic liquid-based ATPS method was applied to milk and honey samples with AMIM-Br under optimal conditions. MITC, OTC, TC, CTC, MTC, and DC tetracyclines were not observed in the milk samples.. The observed tetracycline residues in the honey samples were under maximum residue limits of tetracyclines..
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Known volumes of these real samples were spiked into the SA-AgNPs solution and the UV-vis spectra were recorded.. Preparation of the paper-based kit. Then, 100 m L of SA-AgNPs solution were added onto each paper square and they were allowed to dry at room temperature. Once dried, L -Histidine spiked blood serum and urine samples were added onto the SA-AgNPs coated paper.. The SA-AgNPs coated fi lter paper (Blank) was placed in- side the kit box and the USB was connected with the smart- phone.
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The aim of this study was to develop a simple and rapid supramolecular solvent-based microextraction method for separation/enrichment and analysis of rhodamine B in real samples by using UV-Vis spectrometry.. The analysis of rhodamine B by UV-Vis spectrometry was carried out at a wavelength of 558 nm. The transformation of rhodamine B from liquid phase to extraction phase depends on the pH value.
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Determination of deferasirox in pharmaceutical and biological samples. To demonstrate the capability and potential applications of the prepared electrode for sample analysis, the proposed method was applied for the analysis of some real samples and the obtained results are presented in Table 2. The amounts of deferasirox in real samples were determined using the DPV technique and a standard addition method..
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Studies on real samples, herbal and black teas, revealed that the probe MCPC can sensitively and selectively recognize Cu 2+ with good recovery values . The outcomes of the probe MCPC and ICP-OES analyses were also compared and the differences of the means of two methods were not found significantly different (P <0.05). doi: 10.1039/c8ra09943j. doi: 10.1039/c6ra12217e. doi: 10.1016/j.saa .
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Results of real samples analysis. The developed method was applied to analyze 20 real health supplement samples. The results were shown in Table 5.. Results of real samples analysis Sample. code Content of analytes (mg/g) Sample. code Content of analytes (mg/g).
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In the sample analysis, H 2 O 2 removed solutions from the real water samples were used for blank correction in their analysis and this process provides more reliable and accurate results in real sample analysis.. Key words: Hydrogen peroxide determination, high spin peroxo complex, spectrophotometry, real water samples. Hydrogen peroxide (H 2 O 2 ) is a colorless and thermodynamically unstable liquid.
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The standard addition methodology was adopted for the validation of this procedure and effectively applied for the determination of rifampicin in real wastewater samples.. Therefore, the aim of this work was to develop a quick, selective, and simple CPE method for the preconcentration of RIF in real wastewater samples.. For the pH adjustments, pH meter (Adwa Instruments Kft. Centrifuge machine (Eppendorf AG, 22331 Hamburg-Germany) was employed for the centrifugation of samples.
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In this study, a novel nanocomposite Fe 2 O 3 NPs/MWCNTs-based electrochemical sensor was designed for the detection of kaempferol in real broccoli samples.
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Detection of EGFR mutations in liquid biopsy samples using allele-speci fi c quantitative PCR: A comparative real-world evaluation of two popular diagnostic systems. Allele-specific qPCR EGFR mutations Liquid biopsy. We compared the diagnostic accuracy of two commonly used in vitro diagnostic-certi fi ed allele-speci fi c quantitative PCR assays for detecting plasma cfDNA EGFR mutations..