Atomic absorption

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  • Bài giảng Phương pháp quang phổ hấp thụ nguyên tử (Atomic Absorption Spectroscopy AAS) nêu lên nguyên tắc đo ASS, cấu tạo máy quang phổ hấp thụ nguyên tử, bộ phận tán sắc, máy thu nhận tín hiệu, chọn các thông số của máy thật tối ưu.

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  • Atomic Absorption Spectroscopy is an analytical technique used for the qualitative and quantitative determination of the elements present in different samples like food, nanomaterials, biomaterials, forensics, and industrial wastes. The main aim of this book is to cover all major topics which are required to equip scholars with the recent advancement in this field. The book is divided into 12 chapters with an emphasis on specific topics.

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  • The atomic absorption spectrometry uses absorption of light of intrinsic wavelengths by atoms. All atoms are classified into those having low energies and those having high energies. The state having low energies is called the ground state and the state having high energies is called the excited state. The atom in the ground state absorbs external energies and is put in the excited state. For example, sodium is mainly in two excited states, having higher energies by 2.2eV and 3.6eV respectively than in the ground state, as shown in Fig. 1.1.

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  • Atomic Absorption, Fundamentals and Applications, Different Regions, Absorption Spectrophotometry, Fresh and Deparaffinized, Antioxidant Properties

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  • This article reviews methods for the determination and identification of trace elements in wine by using atomic absorption spectrometry (AAS). Wine is one of the most widely consumed beverages and strict analytical control of trace elements content is required during the whole process of wine production from grape to the final product.

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  • This third edition retains the range of analytical techniques and the structure of individual chapters of the second edition. However, there are some significant changes, with the introduction of new topics and some deletions, to take into account the changing priorities in environmental analysis.

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  • Modern Spectroscopy has been written to fulfil a need for an up-to-date text on spectroscopy. It is aimed primarily at a typical undergraduate audience in chemistry, chemical physics, or physics in the United Kingdom and at undergraduate and graduate student audiences elsewhere. Spectroscopy covers a very wide area which has been widened further since the mid- 1960s by the development of lasers and such techniques as photoelectron spectroscopy and other closely related spectroscopies.

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  • Both infrared and Raman spectroscopy are extremely powerful analytical techniques for both qualitative and quantitative analysis. However, neither technique should be used in isolation, since other analytical methods may yield important complementary and/or confirmatory information regarding the sample. Even simple chemical tests and elemental analysis should not be overlooked and techniques such as chromatography, thermal analysis, nuclear magnetic resonance, atomic absorption spectroscopy, mass spectroscopy, ultraviolet and visible spectroscopy, etc.

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  • A method for determination of arsenic species in environmental samples have been studied (water and sediment of Nhatrang onshore). The analytical method used was ion-exchange liquid chromatography coupled on-line to atomic absorption pectrometry through hydride generation. It was applied to determination of As species in H3PO4+NH2OH.HCl extracts of sediments. The efficiency of this extraction procedure was studied in details. The sensibility of this investigated method allows both the analysis of As-poor samples and the dilution extracts, of As-rich ones.

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  • A new procedure for calculation and analysis of XAFS (X-ray Absorption Fine Structure) cumulants of hcp crystals containing dopant atom has been derived based on quantum statistical theory with generalized anharmonic correlated Einstein model. Analytical expressions for effective local force constants, correlated Einstein frequency and temperature, first cumulant or net thermal expansion, second cumulant or Debye Waller factor and third cumulant of hcp crystals containing dopant atom have been derived.

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  • Hydrotalcite-type (HT) materials based on ZnAlO and MgAlO have been prepared and investigated by various physico-chemical method: IR, XRD, BET... It was found that the HT structure depended on the nature and the atom ratio of the metals. The adsorption ability of the materials was tested with the reactive dyes Red 3BA as a model compound. The results indicated that the materials with the HT structure and atom ratio of Me2+ /Me3+ = 3 : 1 calcinated at < 500o C have the highest dyes removal. That could be related with the chemical characterization.

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  • Debye-Waller factors (DWFs) of metallic Cu (fcc crystal) in X-ray absorption fine structure (XAFS) presented in terms of cumulant expansion have been studied based on the anharmonic correlated Debye model (ACDM). This ACDM is derived from the many-body perturbation approach and the anharmonic effective potential that includes the first shell near neighbor contributions to the vibration between absorber and backscatterer atoms.

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