Modern coin debasement discovered by combined portable X-ray fluorescence and atomic absorption spectroscopy in Peruvian cent coins (1950-1965)

2018 ◽  
Vol 48 (1) ◽  
pp. 21-28 ◽  
Author(s):  
Luis Ortega-San-Martín ◽  
Marvin K. Sarango-Ramírez ◽  
Betty C. Galarreta
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
X Ray

scholarly journals Synthesis and Characterisation of New {Fe2CrO} Heterotrinuclear Iron-chromium Clusters

2021 ◽  
Author(s):  
Viorina Gorinchoy ◽  
Olesea Cuzan ◽  
Silvia Melnic ◽  
Oleg Petuhov ◽  
Sergiu Shova
Keyword(s):  
Thermal Properties ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Elemental Analysis ◽  
Atomic Absorption Spectroscopy ◽  
X Ray ◽  
Heteronuclear Complexes ◽  
The Stability ◽  
Iron Chromium ◽  
Salicylic Acids

Two new μ3-oxo trinuclear heterometallic Fe2IIICrIII complexes with furan-2-carboxylic and salicylic acids with the composition: [Fe2CrO(C4H3OCOO)6(CH3OH)3]NO3·0.5CH3OH and [Fe2CrO(C6H4(OH)COO)7(CH3OH)2]·2DMA were synthesized starting from iron(III) and chromium(III) salts mixture. The complexes structures were confirmed by elemental analysis, IR, Mössbauer spectroscopies, and X-ray analysis. The atomic absorption spectroscopy confirmed that the iron: chromium ratio is 2:1. The thermal properties of both heteronuclear complexes have been investigated in oxidizing and inert atmospheres revealing the stability of the trinuclear core up to 170 and 220°C, respectively.

scholarly journals X-Ray Fluorescence Determination of Manganese in FD&C Blue No. 1

1998 ◽  
Vol 81 (1) ◽  
pp. 89-92 ◽  
Author(s):  
Nancy M Hepp
Keyword(s):  
Confidence Interval ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Limit Of Detection ◽  
X Ray ◽  
Fluorescence Determination

Abstract An X-ray fluorescence (XRF) method was developed for determining manganese in FD&C Blue No. 1 from simply prepared pressed pellets. Results were compared with those of atomic absorption spectroscopy (AAS) of acid-digested or ashed samples. Levels of manganese determined by XRF and AAS were equivalent. The limit of detection (3σ) for the XRF method was 3µg manganese/g dye. The 95% confidence interval at the specification level was 100 ± 10 μg manganese/g dye

Characterization of the Non-Polymeric Fraction of Post-Consumer LCD Monitor Housings

2018 ◽  
Vol 912 ◽  
pp. 218-223
Author(s):  
Natalia Massaro ◽  
Cátia Fredericci ◽  
Samuel Marcio Toffoli ◽  
Ticiane Sanches Valera
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Xrd Analysis ◽  
Inorganic Materials ◽  
Ambient Atmosphere ◽  
X Ray Diffraction ◽  
X Ray ◽  
Computer Monitors ◽  
Polymeric Fraction

This work aims to characterize the non-polymeric components, usually present as additives to perform different functions, present in the polymer housing of post-consumer computer monitors, in order to help finding the most adequate recycling destination for such material. The non-polymeric fraction was characterized by thermogravimetry (TG), loss on ignition (LOI), chemical analysis by X-ray fluorescence (XRF), and atomic absorption spectroscopy, scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS), and X-ray diffraction (XRD). TG analysis indicated that the polymer has about 4 wt% of inorganic materials (performed in N2 atmosphere), whereas LOI (performed in ambient atmosphere) indicated just 0.07 wt%. The XRF, SEM/EDS analyses, and atomic absorption spectroscopy of the post-fired material confirmed the presence of many elements. Nonetheless, toxicological relevant elements showed acceptable concentration levels, below 0.01 ppm. The XRD analysis indicated the presence of crystalline phases based on CaCO3, SiO2 and TiO2.

Decomposition of Some Skarn-Rock Samples in Neutral and Basic Molten Potassium Nitrate for the Extraction and Determination of Iron

1996 ◽  
Vol 49 (2) ◽  
pp. 261 ◽  
Author(s):  
JK Mujumba ◽  
BD James ◽  
SA Tariq
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Iron Content ◽  
Potassium Nitrate ◽  
Total Iron ◽  
Total Iron Content ◽  
X Ray ◽  
Rock Samples

Five skarn -rock samples were heated with KNO3 and with a solution of 5% KOH in KNO3 for 2 h at 450°C. The decomposed samples were cooled, dissolved in water and filtered. Iron was extracted from each residue as well as from the original samples by hot conc. HCl , and determined by atomic absorption spectroscopy. These results were compared with the known (X-ray fluorescence) total iron content of the original samples. The amount of iron extracted with HCl from the skarn samples was 3-11% lower, while that extracted after heating with KNO3 alone was 2-4% lower, than the amount present according to the X-ray fluorescence results. However, the amount of iron extracted from the samples treated with a solution of KOH in KNO3 was comparable to that determined by X-ray fluorescence.

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