scholarly journals Geochemistry and Radioactivity of Mineralized Pegmatite from Abu Rusheid Area, South Eastern Desert, Egypt

2011 ◽  
Vol 22 (2) ◽  
pp. 99-130
Author(s):  
Ablah Ahmad Ragab Ablah Ahmad Ragab
Keyword(s):  
Inductively Coupled Plasma ◽  
Eastern Desert ◽  
Major And Trace Elements ◽  
Tetrad Effect ◽  
High Concentration ◽  
Pegmatite Vein ◽  
Zonal Distribution ◽  
Inductively Coupled ◽  
Wall Zone ◽  
Soda Content

The mineralized pegmatite of Abu-Rusheid area, S. Eastern Desert, has quartz core and feldspars and mica margins. This pegamtite was analyzed by the Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) to determine the content of the major and trace elements including the rare earth elements (REE). The mineralized pegmatite vein trends NNW-SSE with dip of about 10- 30° due WSW. It is emplaced parallel to foliation and banding of the cataclastic country rocks. The studied pegmatite is classified as rare metals-enriched and shows a zonal distribution from the barren core to the mineralized wall-zone in the metals; Nb, Ta, Zr, Hf, Th, U, Y and Ga. The main carriers of the trace metals are zircon, rutile, columbitetantalite, samarskite and other REE and Th-U minerals. Cassiterite, chlorite, deep violet fluorite, calcite, goethite, hematite, pyrite, magnetite, zinnwaldite, and phlogobite, are the main accessory minerals. The studied pegmatite is highly differentiated, NYF-type and characterized by high FeO/MgO ratio with high concentration of Nb, Y, Zr, Th, U, REE (except Eu), and Ga. It is derived from Fenriched proterozoic crustal source depleted in Cs, B and P. The rock is peraluminous and highly fractionated and had been affected by hydrothermal alteration. The pegmatite displays clear M-type tetrad effect of the REE. The calculated tetrad effect in the pegmatite of Abu-Rusheid demonstrates clear tendency towards the ratios of the common isovalents such as Zr/Hf, Nb/Ta and Y/Ho. However, the tetrad effect seems not to be mutual with the content of Na2O and Rb/Sr. The absence of coherence between tetrad effect and soda content may indicate insignificant role of the Na-metasomatism in developing the tetrad effect. The pegmatite has a prominent negative Eu anomaly and excessively low K/Rb ratio. The radioactivity of the studied pegmatite is related to a) uranium mineral (autunite), b) thorium minerals (thorite, thorianite and uranothorite) and c)

scholarly journals The paleoproterozoic post-tectonic granites of the Gavião Block: the example of Salininha monzogranite, Brumado, Bahia, Brazil

2019 ◽  
Vol 19 (1) ◽  
pp. 83-98 ◽  
Author(s):  
Rafael Gordilho Barbosa ◽  
Johildo Salomão Figueiredo Barbosa ◽  
Michael Andrew Hamilton ◽  
Jailma Santos de Souza de Oliveira ◽  
Lucas De Queiroz Salles
Keyword(s):  
Inductively Coupled Plasma ◽  
Major And Trace Elements ◽  
Lithium Tetraborate ◽  
High Concentration ◽  
Inductively Coupled ◽  
Average Value ◽  
South Central ◽  
High Silica ◽  
Ree Patterns

The Gavião Block is underlain by a variety of Archean orthogneisses and greenstone belts, intruded by a suite of syn-deformational and post-tectonic granitoids which ages of emplacement are poorly constrained between the Paleoand Mesoproterozoic. The Salininha monzogranite is a massive intrusion located approximately 50 km northwest of Brumado, south-central Bahia state, Brazil. The intrusion is representative of several post-tectonic felsic plutons in the Gavião Block. Their petrology, geochemistry and age have been largely unstudied. Salininha pluton is a roughly 16 km2 irregular, elongate body intruding strongly deformed and metamorphosed orthogneisses and migmatites of the Archean Gavião Complex. Modally, the Salininha rocks contain biotite as the major ferromagnesian accessory, besides lesser hornblende, muscovite, chlorite, zircon, opaques and epidote. They are slightly peraluminous rocks with high silica contents (71.6 – 75.0wt%), obtained by lithium tetraborate fusion inductively coupled plasma (ICP). The rocks have high concentration of Rb, Sr and Ba (323,88 and 1,155 ppm, respectively). These values were obtained by lithium tetraborate fusion (mass spectrometer—MS). The average value obtained for the La/Yb ratio was 18.83. Chondrite-normalized rare earth element (REE) patterns show a smooth, restricted range, with moderate light REE enrichment, but flat heavy REE patterns — all samples show pronounced negative Eu anomalies consistent with feldspar fractionation. Major and trace elements have trends, which indicate that crystal fractionation of plagioclase, K-feldspar and biotite — an important process during magmatic evolution of the pluton. The trace element data provided support to the classification of the Salininha monzogranite as a post-collisional intrusion. A representative sample has yielded an early Orosirian U-Pb (zircon) age of 2003 ± 4 Ma, via chemical abrasion-isotope dilution-thermal ionization

scholarly journals Crystallization of CaCO3 in Aqueous Solutions with Extremely High Concentrations of NaCl

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 647
Author(s):  
Mengqi Qian ◽  
Yuwei Zuo ◽  
Zhihao Chen ◽  
Xiaoshuang Yin ◽  
Ying Liu ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
High Concentration ◽  
Retention Efficiency ◽  
Static Test ◽  
Inductively Coupled ◽  
High Concentrations ◽  
The One ◽  
Phosphate Inhibitors

The effect of NaCl at extremely high concentrations from 3.5 to 14 wt. % on the crystallization of CaCO3 was investigated in depth. The static test experiment verified that the Ca2+ retention efficiency (η) of NaCl on CaCO3 scale increased from 31.06% (3.5 wt. %) to 41.56% (14 wt. %). Based on the calculation of supersaturation rations, the high concentration of NaCl could reduce the activity coefficients of [Ca2+] and [CO32−], thus reducing the actual concentration of CaCO3. The CaCO3 deposition rate constants (k) showed that NaCl slowed down the rate of CaCO3 crystallization. The X–ray diffraction (XRD) testing disclosed that the growth of (1 0 4) and (1 1 0) faces from calcite was impeded, while the formation of (1 1 1) face from aragonite was induced by the increasing concentration of NaCl. The inductively coupled plasma optical emission spectrometry (ICP–OES) results indicated that Na+ could be doped into CaCO3, leading to the one–dimensional crystal growth. It was further proved that NaCl heightens the efficiency of the typical phosphate inhibitors (2–phosphonobutane–1,2,4–tricarboxylic acid (PBTCA) and 1–hydroxyethane–1,1–diphosphonic acid (HEDP)) on prohibiting the scale of CaCO3.

scholarly journals Human Health Risk Assessment through Roasted Meats Consumption

2020 ◽  
Vol 17 (18) ◽  
pp. 6737 ◽  
Author(s):  
Luana C. S. Leite ◽  
Elaine S. de P. Melo ◽  
Daniela G. Arakaki ◽  
Elisvânia F. dos Santos ◽  
Valter A. do Nascimento
Keyword(s):  
Inductively Coupled Plasma ◽  
Hazard Quotient ◽  
Microwave Digestion ◽  
Adult Population ◽  
Human Health Risk ◽  
Daily Intake ◽  
Major And Trace Elements ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Raw Meats

Data on the content of metals and metalloids in roasted meats with different types of wood and charcoal are still scarce in the literature. The concentrations of metals (Al, Cr, Cd, Cu, Fe, Mg, Mn, Mo, Ni, V, and Zn) and metalloid (As) were determined by inductively coupled plasma mass spectrometry (ICP-OES) after microwave digestion, and the estimated daily intake (EDI) for adults was assessed to determine the hazard quotient (HQ). The concentrations of Al, Cr, Cu, and Fe in raw meats were below the data obtained in other countries. The concentration of As (0.17 ± 0.42–0.23 ± 0.10 mg/kg), Mg (206.77 ± 3.99–291.95 ± 8.87 mg/kg), V (0.42 ± 0.14–6.66 ± 0.80 mg/kg), and Zn (6.66 ± 0.80–48.13 ± 0.56 mg/kg) in raw meats exceeded the values in the literature. The concentrations of Mg, As, Cr, Fe, V, and Zn are high when the meat is roasted using wood. All levels of Al, As, Cr, Cu, Fe, Mg, Mn, Mo, V, and Zn in raw meats are lower than those of meat roasted with coal and wood. The content of As in meat roasted with Chromed Copper Arsenate (CCA) wood (15.10 ± 0.27–26.25 ± 1.47 mg/kg) is higher than meat roasted with charcoal (0.46 ± 0.09–1.16 ± 0.50 mg/kg). EDI and HQ values revealed a minimal exposure of the adult population to those metals through roasted-meats consumption. However, EDI values of As in some roasted meats are above standard limits. Roast meats with wood showed higher levels of major and trace elements than meats roasted with coal. High exposures, in the long-term, may cause damage to health.

scholarly journals Influence of mercury on chlorophyll content in winter wheat and mercury bioaccumulation

2010 ◽  
Vol 56 (No. 3) ◽  
pp. 139-143 ◽  
Author(s):  
D. Liu ◽  
X. Wang ◽  
Z. Chen ◽  
H. Xu ◽  
Y. Wang
Keyword(s):  
Winter Wheat ◽  
Chlorophyll Content ◽  
Inductively Coupled Plasma ◽  
Dry Weight ◽  
High Concentration ◽  
Field Mass ◽  
Wheat Growth ◽  
Inductively Coupled ◽  
Mercury Bioaccumulation ◽  
Wheat Leaves

Mercury (Hg) is one of the major pollutants in soils because of the annual import of toxic Hg into the agricultural lands. The aims of the present studies are to investigate the effect of Hg on chlorophyll content in winter wheat var. jinan No. 17. Moreover, calcium (Ca) levels and bioaccumulation of Hg in wheat leaves were studied with the technique of inductively coupled plasma sector field mass spectrometer (ICP-SF-MS). The study conducted a range of Hg concentrations from 0~500 mg Hg/kg in the dry weight soil. The soil was artificially contaminated with Hg as follows: 0, 100, 200, and 500 mg Hg/kg as HgCl<SUB>2</SUB>. At early stages of the wheat growth, both low and high concentration of Hg stimulates chlorophyll content, but inhibits chlorophyll content at later stages of the wheat growth. Furthermore, the concentrations of Ca and Hg in wheat leaves increased with the increasing concentration of Hg<SUP> </SUP>on the thirty-fourth day with the technique of ICP-SF-MS. The results indicate that Hg can accelerate the absorption of Ca in winter wheat and Hg stress may affect Ca levels in wheat leaves.

Determination of the Matrix Element Vanadium in the Potassium Metavanadate by Inductively Coupled Plasma Atomic Emission Spectrometry

2013 ◽  
Vol 740 ◽  
pp. 665-669
Author(s):  
Yong Cheng ◽  
Hui Xian Peng ◽  
Jin Hong Yuan
Keyword(s):  
Inductively Coupled Plasma ◽  
Atomic Emission ◽  
Atomic Emission Spectrometry ◽  
Emission Spectrometry ◽  
High Concentration ◽  
Plasma Atomic Emission Spectrometry ◽  
Inductively Coupled ◽  
The Matrix ◽  
Standard Solution

The potassium metavanadate samples were digested by hydrochloric acid and diluted with water to a constant volume, then the inductively coupled plasma atomic emission spectrometry (ICP-OES) was used to directly determine the content of 10 to 45% matrix vanadium. The matrix effects, spectral interference, background noise and other interference factors in the high concentration of potassium ions coexistence system were all examined in the paper. The results showed that although the coexisting alkali metal potassium significantly increased the ICP flame, the 1g/L potassium standard solution did not produce peaks in the scanning window of analysis line which substantially coincide with the reagent blank signal line, i.e., the 28% (or 0.28g/L) potassium contained in the potassium metavanadate did not interfere with the determination. Therefore, only the standard solution of vanadium was used to draw a calibration curve without the need of potassium matrix matching. In order to obtain a wide linear range and improve the detection precision and the accuracy of the matrix element vanadium, the sample dilution ratio and ICP spectrometer detection parameters were optimized, and the suitable sensitivity spectral lines and their detection integral and background correction regional were selected, the detection signal intensity of the high concentration vanadium is effectively regulated moderate, the detection range is covered from 10 to 45%, which fully meet the need for determination of vanadium in the potassium metavanadate (qualified products containing 37% vanadium). The results also showed that the background equivalent concentration is less than 5 μg/L, the relative standard deviation (RSD) is less than 1.0%, the detection results consistent with the redox titration method. The method is simple and fast, accurate and reliable, the precision is high. The inspection cycle is 10 to 15 minutes, which is greatly shorter than the chemical titration that takes 2 to 3 hours, so that the method meet the requirements of fast-paced production site of the potassium metavanadate product quality inspection and control.

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