A combined EMPA and LA-ICP-MS study of Li-bearing mica and Sn–Ti oxide minerals from the Qiguling topaz rhyolite (Qitianling District, China): The role of fluorine in origin of tin mineralization

2015 ◽  
Vol 65 ◽  
pp. 779-792 ◽  
Author(s):  
Lei Xie ◽  
Ru-Cheng Wang ◽  
Lee A. Groat ◽  
Jin-Chu Zhu ◽  
Fang-Fang Huang ◽  
...  
Keyword(s):  
Icp Ms ◽  
Oxide Minerals ◽  
Topaz Rhyolite

Sulfidisation Promotion Effect of Ammonium Sulfate on Flotation of Copper Oxide Ore

2012 ◽  
Vol 524-527 ◽  
pp. 1109-1114
Author(s):  
Dian Wen Liu ◽  
Jian Jun Fang ◽  
Xiao Lin Zhang ◽  
Shu Ming Wen ◽  
Zhi Cong Wei ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Ammonium Sulfate ◽  
Sodium Sulfide ◽  
Pure Copper ◽  
Sem Images ◽  
Promotion Effect ◽  
Flotation Recovery ◽  
Oxide Minerals ◽  
Sulfide Ions

This paper presents the sulfidisation promotion effect of ammonium sulfate on the sulfidisation flotation of both malachite and copper oxide ores. Copper oxide ores are commonly difficult-to-float due to its molecular structure, and adding sodium sulfide as activator is necessary; however, its dosage to the flotation pulp must be strictly controlled, as it is also a powerful depressant for copper sulfide minerals, and will, if in excess, depress the activated copper oxide minerals. This depression will be alleviated while ammonium sulfate is added, as it accelerates the speed of sulfidisation, and alleviates excessive sulfide ions on the depression of copper oxide minerals. Ammonium sulfate, therefore, may be a sulfidisation promoter, and plays a role of sulfidisation promotion effect; it makes the coating of sodium sulfide on the ore surface more dense and stable, which is ready for xanthate adsorption on the surface of copper oxide minerals. The results of experiments show that the flotation recovery is increased 12.28% while ammonium sulfate is added in the presence of excessive sodium sulfide in the pulp, and the highest recovery is obtainable when the ammonium sulfate and sodium sulfide are in the same dosages. The sulfidisation promotion effect of ammonium sulfate is confirmed by pure copper oxide mineral flotation test and copper oxide ores flotation test, as well as by SEM images of floated malachite.

Study on the protective role of selenium against cadmium toxicity in lactic acid bacteria: An advanced application of ICP-MS

2008 ◽  
Vol 153 (3) ◽  
pp. 1157-1164 ◽  
Author(s):  
I ARAUZ ◽  
S AFTON ◽  
K WROBEL ◽  
J CARUSO ◽  
J CORONA ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
Cadmium Toxicity ◽  
Protective Role ◽  
Icp Ms

Ultrafast laser ablation ICP-MS: role of spot size, laser fluence, and repetition rate in signal intensity and elemental fractionation

2014 ◽  
Vol 29 (2) ◽  
pp. 339-346 ◽  
Author(s):  
Prasoon K. Diwakar ◽  
Jhanis J. Gonzalez ◽  
Sivanandan S. Harilal ◽  
Richard E. Russo ◽  
Ahmed Hassanein
Keyword(s):  
Laser Ablation ◽  
Laser Fluence ◽  
Repetition Rate ◽  
Signal Intensity ◽  
Spot Size ◽  
Ultrafast Laser ◽  
Elemental Fractionation ◽  
Icp Ms ◽  
Ultrafast Laser Ablation

scholarly journals On the possibilities of ICP-AES for analysis of archaeological bones

2003 ◽  
Vol 1 (3) ◽  
Author(s):  
B. Zlateva ◽  
R. Djingova ◽  
I. Kuleff
Keyword(s):  
Inductively Coupled Plasma ◽  
Cross Flow ◽  
Atomic Emission ◽  
Major Elements ◽  
Emission Spectrometry ◽  
Plasma Atomic Emission Spectrometry ◽  
Inductively Coupled ◽  
Animal Bone ◽  
Icp Ms

AbstractThe possibility of using inductively coupled plasma atomic emission spectrometry (ICP-AES) to determine the elemental composition of archaeological bones elements was evaluated and discussed. The interferences of the major elements (Ca, P, K, Na, Al and Fe) on the microelements (Ba, Cd, Co, Cr, Cu, Mn, Ni, Pb, Sr, Zn) were investigated and the appropriate analytical lines were selected. The role of different nebulizers (cross-flow, Babington and Meinhard) on detection limits were investigated. The applicability of the proposed procedure was demonstrated analyzing IAEA-SRM-H-5 (Animal bone); and authentic bone sample dating back to the 4th century BC. These results were compared to ETAAS and ICP-MS.

scholarly journals Multi-Modal Mass Spectrometric Imaging of Uveal Melanoma

Metabolites ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 560
Author(s):  
Laura M. Cole ◽  
Joshua Handley ◽  
Emmanuelle Claude ◽  
Catherine J. Duckett ◽  
Hardeep S. Mudhar ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Cancer Metastasis ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Ionisation Mass Spectrometry ◽  
Plasma Mass Spectrometry ◽  
Tumour Periphery ◽  
Modal Mass

Matrix assisted laser desorption ionisation mass spectrometry imaging (MALDI-MSI), was used to obtain images of lipids and metabolite distribution in formalin fixed and embedded in paraffin (FFPE) whole eye sections containing primary uveal melanomas (UM). Using this technique, it was possible to obtain images of lysophosphatidylcholine (LPC) type lipid distribution that highlighted the tumour regions. Laser ablation inductively coupled plasma mass spectrometry images (LA-ICP-MS) performed on UM sections showed increases in copper within the tumour periphery and intratumoural zinc in tissue from patients with poor prognosis. These preliminary data indicate that multi-modal MSI has the potential to provide insights into the role of trace metals and cancer metastasis.

scholarly journals Dissolved and Suspended Forms of Metals and Metalloids in Snow Cover of Megacity: Partitioning and Deposition Rates in Western Moscow

Atmosphere ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 907 ◽  
Author(s):  
Dmitry Vlasov ◽  
Jessica Vasil’chuk ◽  
Natalia Kosheleva ◽  
Nikolay Kasimov
Keyword(s):  
Snow Cover ◽  
Background Level ◽  
Solid Particles ◽  
Deposition Rates ◽  
Metals And Metalloids ◽  
Icp Ms ◽  
The City ◽  
Dust Load ◽  
Dissolved Form

Concentrations and ratio of dissolved and suspended forms of metals and metalloids (MMs) in snow cover and their deposition rates from the atmosphere in the western part of Moscow were studied. Forms of MMs were separated using a filter with pore diameter of 0.45 μm; their concentrations were measured by ICP-MS and ICP-AES methods. Anthropogenic impact in Moscow caused a significant increase in dust load (2–7 times), concentration of solid particles in snow cover (2–5 times), and mineralization of snow meltwater (5–18 times) compared to the background level. Urban snow contains Sn, Ti, Bi, Al, W, Fe, Pb, V, Cr, Rb, Mo, Mn, As, Co, Cu, Ba, Sb, Mg mainly in suspended form, and Ca and Na in dissolved form. The role of suspended MMs in the city significantly increases compared to the background region due to high dust load, usage of de-icing salts, and the change of acidic background conditions to alkaline ones. Anthropogenic emissions are the main sources of suspended Ca, W, Co, V, Sr, Ti, Mg, Na, Mo, Zn, Fe, Sb, and Cu in the snow cover of traffic zone. These elements’ concentrations in roadside snow cover exceed the background values more than 25 times. The highest concentrations and deposition rates of MMs in the snow of Moscow are localized near the large and medium roads.

Calcite interval in aragonite seas: Geochemical characterization of post-extinction oolites at the Triassic-Jurassic boundary and their implications

2021 ◽  
Author(s):  
Ingrid Urban ◽  
Sylvain Richoz
Keyword(s):  
Mass Extinction ◽  
Major And Trace Elements ◽  
Late Triassic ◽  
Geochemical Data ◽  
Mass Extinctions ◽  
Icp Ms ◽  
Petrographic Analyses ◽  
Isotope System ◽  
Extinction Events

<p>The End-Triassic Mass Extinction (ETME) is one of the five major mass extinctions of the Phanerozoic. The deposition of ooids is atypically high in the direct aftermath of major extinction events, including the ETME. Ooids were intensively investigated both petrographically and sedimentologically in the past decades; but only recently their potentialities as archives for the original chemical composition of the oceans where they formed, have gained awareness. Here we present stratigraphical, sedimentological and geochemical aspects for a mid-Norian-Hettangian section from the Emirates.</p><p>Petrographic analyses provided a detailed morphological classification of post-ETME coated grains, supported by point counting of two isochronous geological sections. FE-SE-EDX imaging unraveled peculiar µm-scale features linked to morphology, diagenesis and biotic interaction in the cortex. LA-ICP-MS analyses were performed for specific major and trace elements. Post-extinction oolites show high variability in size and development of the cortex. They range from small (~ 300 µm) and superficial coating, to bigger (up to 800 µm) and well developed. The degree of micritization highlights different oxic conditions in the diagenetic environment. LA-ICP-MS analyses give insights into seawater redox conditions during ooids formation, siliciclastic contamination, diagenetic processes and the role of bacterial strain in shaping the ooids. Petrographical and geochemical data point out to a calcitic deposition of these ooids as odd with the general consideration that the Late Triassic to Early Jurassic was part of the Aragonite sea. This has major implication on the understanding of the carbonate saturation in the oceans just after the mass-extinction and on the interpretation of several proxies as the C and Ca isotope-system.</p><p> </p><p> </p>

Understanding the role of accessory minerals in the Sm-Nd isotopic evolution of ancient rocks: An in-situ LA-(MC)-ICP-MS approach

2020 ◽  
Author(s):  
Johannes Hammerli
Keyword(s):  
Hf Isotope ◽  
Nd Isotope ◽  
Accessory Minerals ◽  
Icp Ms ◽  
Isotopic Evolution ◽  
Magma Sources ◽  
Mantle Reservoir ◽  
Isotope System

<p>The long-lived radiogenic isotope systems Lu-Hf and Sm-Nd have been widely used by geochemists to study magma sources and crustal residential times of (igneous) rocks in order to understand how early crust formed and to model the production rate and volume of continental crust on global and regional-scales during the last ~4.4 Ga. However, while throughout most of Earth’s history Nd and Hf isotope signatures in terrestrial rocks are well correlated due to their very similar geochemical behavior, some of Earth’s oldest rocks show an apparent inconsistency in their Nd and Hf isotope signatures. While Hf isotopes in early Archean rocks are generally (near) chondritic, Nd isotope signatures can be distinctly super- or sub-chondritic. The super-chondritic Nd isotope values in Eoarchean samples would suggest that these rocks are derived from a mantle reservoir depleted by prior crust extraction. The chondritic Hf isotope values, on the other hand, support a mantle source from which no significant volume of crust had been extracted. While a range of different processes, some of them speculative, might explain this Hf-Nd isotope paradox, recent research [1, 2] has shown that relatively simple, post-magmatic, open-system processes can explain decoupling of the typically correlative Hf-Nd isotope signatures. This talk will focus on the importance of identifying Nd-bearing accessory minerals in (Archean) rocks to understand how the Sm-Nd isotope system is controlled and how in situ isotope and trace element analyses by LA-(MC)-ICP-MS in combination with detailed petrographic observations help to understand when and via which processes the two isotope systems become decoupled. Reconstructing the isotopic evolution of the different isotope systems since formation of the protoliths has important implications for our understanding of early crust formation and questions some of the proposed current models for early crust extraction from the mantle.</p><p> </p><p>[1] Hammerli et al. (2019) Chem. Geol 2; [2] Fisher et al. (2020) EPSL</p>

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