Optimized condition for etching fused-silica phase gratings with inductively coupled plasma technology

2005 ◽  
Vol 44 (21) ◽  
pp. 4429 ◽  
Author(s):  
Shunquan Wang ◽  
Changhe Zhou ◽  
Huayi Ru ◽  
Yanyan Zhang
Keyword(s):  
Inductively Coupled Plasma ◽  
Fused Silica ◽  
Plasma Technology ◽  
Silica Phase ◽  
Inductively Coupled

Ultrasonic-Assisted Dialysis Coupled with CE-ICP-OES for Determination of Calcium Species in the Dialysate of Human Blood

2011 ◽  
Vol 343-344 ◽  
pp. 769-773
Author(s):  
Bi Yang Deng ◽  
Xiang Shu Xu ◽  
Ying Zi Wang ◽  
Ping Chuan Zhu
Keyword(s):  
Human Blood ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Fused Silica ◽  
Emission Spectrometry ◽  
Icp Oes ◽  
Buffer Solution ◽  
Inductively Coupled ◽  
Ultrasonic Assisted ◽  
Fused Silica Capillary

The analytical method for calcium species in human blood was studied using ultrasonic-assisted dialysis coupled with capillary electrophoreisi (CE) inductively coupled plasma optical emission spectrometry (ICP-OES). The optimal ultrasonic dialysis conditions were 72 W power, 60 min extraction time and 70 μL volume of blood sample. Ultrasonic-assisted dialysis improves significantly the dialysis efficiecy by comparing with balance dialysis. The optimized conditions of separation and detection (a 120 cm length×100 μm i.d. fused-silica capillary, 20 kV separation voltage, 30 mmol/L Tris-HCl with pH7.4 buffer solution) for calcium species were achieved by CE-ICP-OES. The forms of calcium in the dialysate of human blood have five different species. The concentration of free Ca2+ in the dialysate was 0.7 mg/L. The hyphenated technique is simple and convenience, which is fit for the separation and analysis of metal-containing biological samples.

High Throughput Speciation Analysis of Mercury in Water Environment by Short Column Capillary Electrophoresis On-Line Coupled with Inductively Coupled Plasma Mass Spectrometry

2011 ◽  
Vol 383-390 ◽  
pp. 790-795
Author(s):  
Bao Hui Li ◽  
Bao Juan Tian
Keyword(s):  
Mass Spectrometry ◽  
Capillary Electrophoresis ◽  
High Throughput ◽  
Inductively Coupled Plasma ◽  
Speciation Analysis ◽  
Fused Silica ◽  
Short Column ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

A method for mercury high throughput rapid speciation analysis was built by short column capillary electrophoresis (SC-CE) coupled with inductively coupled plasma mass spectrometry (ICP-MS). A micromist nebulizer was employed to increase the nebulization efficiency and a laboratory-made removable SC-CE-ICP-MS interface on the basis of cross design was applied to alleviate buffer contamination of ICP-MS. In less than 60 s methylmercury (MeHg(I)) and inorganic mercury (Hg(II)) were separated in a 16 × 75 μm i.d. short column fused-silica capillary at 21 kV, while a mixture of 30 mmol/L boric aicd + 5% (v/v) CH3OH (pH=8.60) acted as running electrolyte. The precisions (RSD, n=5) of migration time and peak area for MeHg(I) and Hg(II) were in the range of 1.4-2.6% and 3.3-3.4%, respectively. The limits of detection (3σ) mercury species were 9.7 and 12.0 μg/L, respectively. The recoveries for Hg(II) MeHg(I) were in the range of 96-107% and 99-105%.

Mechanistic Studies of Chromium Speciation with Thermospray

2002 ◽  
Vol 56 (9) ◽  
pp. 1152-1160 ◽  
Author(s):  
Xiaohua Zhang ◽  
John A. Koropchak
Keyword(s):  
Inductively Coupled Plasma ◽  
Atomic Emission ◽  
Deposition Process ◽  
Fused Silica ◽  
Chromium Speciation ◽  
Aerosol Formation ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Fused Silica Capillary ◽  
Plasma Mass Spectrometry

Thermospray (TSP) coupled with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) or inductively coupled plasma-mass spectrometry (ICP-MS) has been developed as a non-chromatographic method for chromium speciation to quantitatively separate and determine two chromium oxidation states: Cr(III) and Cr(VI). The limits of detection can reach 0.5 ng/mL with ICP-AES detection and 50 pg/mL with ICP-MS detection. The basis for this speciation method is that Cr(III) can selectively and nearly quantitatively deposit inside a thermospray system as Cr2O3, while Cr(VI) does not. To fully understand the mechanism of this deposition process, four questions were investigated: is aerosol formation necessary for the reaction to occur? Does the deposition occur in the aerosol or liquid regime? Does the deposit tend to be retained on the surface of the fused silica capillary? Can the reaction be predicted from thermodynamic calculations? These studies show that this reaction happens before solvent evaporates (i.e., the liquid regime). The high temperature inside the thermospray system is the major factor triggering this reaction. At the same time, the high pressure is important for its influence on the solvent boiling point, which affects the residence time (the time that the analyte spends in the solution before the solvent evaporates) and the kinetics of the reaction. The effects of the other parameters (vaporizer length, heating length, drawn tip, etc.) on the efficiency of the deposition reaction, represented as background residual signal (BRS), were also studied.

Surface roughening of ground fused silica processed by atmospheric inductively coupled plasma

2015 ◽  
Vol 341 ◽  
pp. 142-148 ◽  
Author(s):  
Qiang Xin ◽  
Na Li ◽  
Jun Wang ◽  
Bo Wang ◽  
Guo Li ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Fused Silica ◽  
Surface Roughening ◽  
Inductively Coupled

Inductively-Coupled Plasma Nitriding of Fused Silica

1986 ◽  
Vol 75 ◽  
Author(s):  
T. K. Vethanayagam ◽  
P. F. Johnson
Keyword(s):  
Surface Temperature ◽  
Nitrogen Content ◽  
Process Parameters ◽  
Inductively Coupled Plasma ◽  
Treatment Time ◽  
Plasma Nitriding ◽  
Hydrogen Plasma ◽  
Fused Silica ◽  
Rf Discharge ◽  
Inductively Coupled

AbstractPlasma nitriding of fused silica has been performed over a temperature range of 750°C to 1300°C in a nitrogen-hydrogen plasma generated by an inductively coupled RF discharge. The plasma is used as both thermal and chemical source. The effects of various process parameters such as surface temperature, gas pressure and treatment time on total nitrogen content have been studied. The advantages and the drawbacks of this direct plasma nitriding technique are briefly discussed.

Solubility of Na2SO4 in silica-saturated solutions: Implications for REE mineralization

2020 ◽  
Vol 105 (11) ◽  
pp. 1686-1694 ◽  
Author(s):  
Huan Chen ◽  
Hao Cui ◽  
Richen Zhong ◽  
Yuling Xie ◽  
Chang Yu ◽  
...  
Keyword(s):  
Fluid Inclusions ◽  
Inductively Coupled Plasma ◽  
Mining Area ◽  
Fused Silica ◽  
Dissolution Behavior ◽  
Solubility Curve ◽  
Mass Balance Calculation ◽  
Inductively Coupled ◽  
Fused Silica Capillary ◽  
Sulfate Melt

Abstract Sulfate is traditionally considered to have retrograde solubility in aqueous solutions. However, our recent hydrothermal diamond-anvil cell (HDAC) experiments have shown that the solubility of Na2SO4 changes from retrograde to prograde in the presence of silica, leading to the formation of sulfate-rich solutions at high temperatures, in line with observations on natural geofluids. In this study, we use synthetic inclusions of fused silica capillary capsules containing saturated Na2SO4 solutions and Na2SO4 crystals to quantitatively investigate the solubility of Na2SO4 at different temperatures in the Na2SO4-SiO2-H2O system. Sulfate concentrations were measured using Raman spectroscopy and calibrated using Cs2SO4 solutions with known concentrations. The solubility of crystalline Na2SO4 dropped slightly when heated from 50 to 225 °C and dramatically from 225 to 313 °C. At 313 °C, the Na2SO4 crystals began to melt, forming immiscible sulfate melt coexisting with the aqueous solution, with or without solid Na2SO4. With the formation of sulfate melt, the solubility of Na2SO4 was reversed to prograde (i.e., solubility increased considerably with increasing temperatures). The solubility of Na2SO4 in the measured solution was significantly higher than that predicted in the absence of SiO2 over the entire temperature range (except for temperatures around 313 °C). This indicates that the presence of SiO2 greatly changes the dissolution behavior of Na2SO4, which may be caused by the formation of a sulfate–silicate intermediates such as Si(OH)4SO42−. Considering that most crustal fluids are silica-saturated, the solubility curve of Na2SO4 obtained in this study can better reflect the characteristics of geofluids when compared to that of Na2SO4-H2O binary system. At temperatures of 313–425 °C, the solubility of Na2SO4 increases with temperature following the function Csulfate = –3173.7/T + 5.9301, where Csulfate and T represent the solubility of Na2SO4 in mol/kg H2O and temperature in Kelvin, respectively. As an application, this temperature-solubility relationship can be used to evaluate the sulfate contents in fluid inclusions that contain sulfate daughter minerals, based on the temperature of sulfate disappearance obtained from microthermometric analysis. The sulfate concentrations of the ore-forming fluids of the giant Maoniuping carbonatite-related rare earth element (REE) deposit (southwest China) were calculated to be 4.67–4.81 m (mol/kg H2O). These sulfate concentrations were then used as internal standards to calibrate the previously reported semi-quantitative results of laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analysis of REE-forming stage fluid inclusions at this deposit. The calculated Ce concentrations in the REE-mineralizing fluid range from 0.42 to 0.49 wt%. The high fluid REE contents suggest that the sulfate-rich fluids are ideal solvents for REE transport. A mass-balance calculation was carried out to evaluate the minimal volume of carbonatite melt that was required for the formation of the giant Maoniuping REE deposit. The result indicates that the carbonatite dikes in the mining area are enough to provide the required fluids and metals, and thus a deep-seated magma chamber is not necessary for ore formation.

Induction Plasma Technology Applied to Powder Manufacturing: Example of Titanium-Based Materials

2016 ◽  
Vol 704 ◽  
pp. 282-286 ◽  
Author(s):  
Romain Vert ◽  
Remy Pontone ◽  
Richard Dolbec ◽  
Luc Dionne ◽  
M.I. Boulos
Keyword(s):  
Additive Manufacturing ◽  
Powder Metallurgy ◽  
Packing Density ◽  
Inductively Coupled Plasma ◽  
Manufacturing Industry ◽  
Critical Properties ◽  
Plasma Technology ◽  
High Quality ◽  
Inductively Coupled ◽  
Powder Manufacturing

Powder metallurgy technologies require specific powders to ensure a good quality to the manufactured parts. The critical properties are; the powder chemistry, flow ability, packing density, and the absence of porosity. This review highlights the capability of Tekna’s Inductively Coupled Plasma (ICP) technology for the production of high quality powders for the additive manufacturing industry.

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