Quantitative Determination of Trace Heavy Metals and Selected Rock-Forming Elements in Porous Carbon Materials by the X-ray Fluorescence Method

Abstract

A new X-ray fluorescence (XRF) method is proposed for sample preparation and impurity quantification for elements heavier than sodium in carbon materials. The analysis is suitable for various materials including amorphous ones, such as petroleum cokes, with an impurity content higher than 0.01%. We compared a new method with the regular additive method to measure impurities in electrode graphite and petroleum coke. The XRF-based method provides the same sensitivity and accuracy and much greater reproducibility of the analysis results for variations in the sample mass, its density, and coverage by exciting X-ray radiation. The method does not require changes in the instrument software and is easily implemented on commercial analytical equipment.

Assessment of the Levels of Potentially Toxic Elements Contained in Natural Bentonites Collected from Quarries in Turkey

“…Interference in the X-ray peak in the spectrum can be easily corrected, thus ensuring high accuracy and sensitivity easily. EDXRF and wavelength-dispersive XRF spectroscopy are used for qualitative and quantitative multi-element analysis of major, minor, and trace elements in archeological, geological, biological, industrial, food, and environmental samples and require minimal sample preparation. ,− The analysis of PTEs in the bentonite samples was performed with the help of the EDXRF spectrometer (Spectro Xepos, Ametek). The EDXRF spectrometer is equipped with an anode X-ray tube (50 W, 60 kV) consisting of a dual thick Pd/Co mixture. ,,,, The EDXRF spectrometer’s target modifier, which optimizes excitation by using polarization and secondary targets, has many different excitation conditions that guarantee the best detection of all elements from Na to U.…”

Application of the Organic Waste-Based Sorbent for the Purification of Aqueous Solutions

“…The thermal nitrogen desorption method was used for determining the specific surface area and pore sizes with the Quantachrome Nova 1000e automatic analyzer. Before analysis, the samples were preliminarily dried to constant weight at a temperature of 250 • C. Degassing was carried out for 10 h for each sample at a temperature of 210 • C under vacuum [27][28][29].…”

Development of composition and study of sorbent properties based on saponite

“…The static exchange capacity (SEC) and rate constants (K) of the ion exchange reaction, corresponding to the slope tangent of the dependence for different concentrations [25,26], are given in Table 3. The sorption of copper ions from the solution by the clay sorbent proceeds in accordance with the kinetic model of the first order, as demonstrated by the dependence lgC = f (t) for the concentration of copper ions 0.022 mol/l (Fig.…”