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37 results on '"Huang, Mao Dong"'

1. Temperature Dependent Diffusion of DMSO in CH3NH3PbI3 Precursor Films During Layer Formation and Impact on Solar Cells

Author

Norbert H. Nickel, Huang Mao-Dong, Qin Tan, Thomas Dittrich, Karsten Hinrichs, Steffen Fengler, Joerg Rappich, and Pongthep Prajongtat

Subjects
Molecular diffusion, Materials science, Continuum (measurement), Dimethyl sulfoxide, Analytical chemistry, Energy Engineering and Power Technology, Infrared spectroscopy, chemistry.chemical_compound, chemistry, Molar ratio, Materials Chemistry, Electrochemistry, Chemical Engineering (miscellaneous), Electrical and Electronic Engineering
Abstract

The temperature dependent out-diffusion of dimethyl sulfoxide (DMSO) from CH3NH3PbI3 precursor layers was investigated by analyzing the S/Pb molar ratio in the layers by high-resolution continuum s...

Published
2019
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8. Shake, shut, and go – A fast screening of sulfur in heavy crude oils by high-resolution continuum source graphite furnace molecular absorption spectrometry via GeS molecule detection

Author

Abad, Carlos, primary, Florek, Stefan, additional, Becker-Ross, Helmut, additional, Huang, Mao-Dong, additional, Lopez-Linares, Francisco, additional, Poirier, Laura, additional, Jakubowski, Norbert, additional, Recknagel, Sebastian, additional, and Panne, Ulrich, additional

Published
2019
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10. A new concept of efficient therapeutic drug monitoring using the high-resolution continuum source absorption spectrometry and the surface enhanced Raman spectroscopy

Author

Xing, Yanlong, primary, Fuss, Harald, additional, Lademann, Jürgen, additional, Huang, Mao Dong, additional, Becker-Ross, Helmut, additional, Florek, Stefan, additional, Patzelt, Alexa, additional, Meinke, Martina C., additional, Jung, Sora, additional, and Esser, Norbert, additional

Published
2018
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11. Zirconium permanent modifiers for graphite furnaces used in absorption spectrometry: understanding their structure and mechanism of action

Author

Abad, Carlos, primary, Florek, Stefan, additional, Becker-Ross, Helmut, additional, Huang, Mao-Dong, additional, Buzanich, Ana Guilherme, additional, Radtke, Martin, additional, Lippitz, Andreas, additional, Hodoroaba, Vasile-Dan, additional, Schmid, Thomas, additional, Heinrich, Hans-Joachim, additional, Recknagel, Sebastian, additional, Jakubowski, Norbert, additional, and Panne, Ulrich, additional

Published
2018
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14. Determination of organic chlorine in water viaAlCl derivatization and detection by high-resolution continuum source graphite furnace molecular absorption spectrometry

Author

Abad, Carlos, Mimus, Stefanie, Recknagel, Sebastian, Jakubowski, Norbert, Panne, Ulrich, Becker-Ross, Helmut, and Huang, Mao-Dong

Abstract

High-resolution continuum source graphite furnace molecular absorption spectrometry (HR-CS-GF-MAS) was employed for determining adsorbable organic chlorine (AOCl) in water. Organic chlorine was indirectly quantified by monitoring the molecular absorption of the transient aluminum monochloride molecule (AlCl) around a wavelength of 261.42 nm in a graphite furnace. An aluminum solution was used as the molecular-forming modifier. A zirconium coated graphite furnace, as well as Sr and Ag solutions were applied as modifiers for a maximal enhancement of the absorption signal. The pyrolysis and vaporization temperatures were 600 °C and 2300 °C, respectively. Non-spectral interferences were observed with F, Br, and I at concentrations higher than 6 mg L−1, 50 mg L−1, and 100 mg L−1, respectively. Calibration curves with NaCl, 4-chlorophenol, and trichlorophenol present the same slope and dynamic range, which indicates the chlorine atom specificity of the method. This method was evaluated and validated using synthetic water samples, following the current standard DIN EN ISO 9562:2004 for the determination of the sum parameter adsorbable organic halides (AOX) for water quality. These samples contain 4-chlorophenol as the chlorinated organic standard in an inorganic chloride matrix. Prior to analysis, organic chlorine was extracted from the inorganic matrix viasolid-phase extraction with a recovery rate >95%. There were no statistically significant differences observed between measured and known values and for a t-test a confidence level of 95% was achieved. The limits of detection and characteristic mass were found to be 48 and 22 pg, respectively. The calibration curve was linear in the range 0.1–2.5 ng with a correlation coefficient R2= 0.9986.

Published
2021
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15. A solid sampling electrothermal atomic absorption spectrometry method for direct determination of silicon in titanium pieces

Author

Viliam Krivan and Huang Mao Dong

Subjects
Detection limit, Silicon, Calibration curve, Analytical chemistry, chemistry.chemical_element, Standard solution, Analytical Chemistry, law.invention, Matrix (chemical analysis), chemistry, law, Graphite, Atomic absorption spectroscopy, Spectroscopy, Titanium
Abstract

A direct solid sampling electrothermal atomic absorption spectrometry method using a transversely heated graphite tube and the boat technique was developed for the determination of silicon in titanium metal pieces. To facilitate the atomisation of silicon from the titanium matrix, carbon powder and Pd–Mg(NO3)2 were used as modifiers. Sample amounts of up to 6 mg could be applied per atomisation. Quantification was performed by using calibration curves measured with aqueous standard solution pipetted onto the matrix residue from the previous sample run. In checking the accuracy, good agreement of the results with those of two independent methods was achieved. The method provides a limit of detection of 30 ng g−1.

Published
2003
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17. Determination of trace impurities in titanium dioxide by slurry sampling electrothermal atomic absorption spectrometry

Author

Huang Mao Dong, Gerhard Schlemmer, Bernhard Welz, and Viliam Krivan

Subjects
Aqueous solution, Calibration curve, Analytical chemistry, chemistry.chemical_element, Atomic and Molecular Physics, and Optics, Analytical Chemistry, law.invention, Matrix (chemical analysis), chemistry.chemical_compound, chemistry, law, Titanium dioxide, Slurry, Neutron activation analysis, Atomic absorption spectroscopy, Instrumentation, Spectroscopy, Titanium
Abstract

A slurry sampling electrothermal atomic absorption spectrometry method for the determination of Al, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Na, Ni, Pb, Sr, Tl and Zn in powdered titanium dioxide is described. The behaviour of the titanium matrix in the atomizer and its interferences with the determination of Al, Fe, Co, Ni and Mn were studied. A tungsten carbide modified graphite tube was used to improve the signal shape and the repeatability for the determination of Fe. For all elements, except for Cd and Pb, quantification by a calibration curve established with aqueous standards was possible. No chemical modifier was used throughout in order to minimize contamination. For the contamination risk elements such as Ca, Fe, K, Mg, Na and Zn, the slurry sampling technique allows to achieve limits of detection (3 σ of the blank) 5–20 times lower than the solution technique, resulting for these elements in values of 1, 3, 0.5, 0.5, 0.9 and 2 ng g −1 , respectively, and, generally being in the range of 0.2 ng g −1 (Cd) to 10 ng g −1 (Al and Tl). The results obtained by the slurry sampling technique are compared with those of other independent methods including four solution methods and neutron activation analysis.

Published
1997
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20. Spectrochimica Acta Part B: Atomic Spectroscopy

Author

Bohrer, Denise, Heitmann, Uwe, Huang, Mao dong, Becker-Ross, Helmut, Florek, Stefan, Welz, Bernhard, and Bertagnolli, Denise

Subjects
Iron matrix, Pharmaceutical formulations, High-resolution continuum source atomic absorption spectrometry, Spectral interferences, Aluminum determination
Abstract

Texto completo: acesso restrito. p. 1012-1018 Submitted by Suelen Reis (suziy.ellen@gmail.com) on 2014-01-20T13:40:47Z No. of bitstreams: 1 1-s2.0-S0584854707001322-main.pdf: 690864 bytes, checksum: 6cae90d9e2b22aa7f047b40153e7924b (MD5) Made available in DSpace on 2014-01-20T13:40:47Z (GMT). No. of bitstreams: 1 1-s2.0-S0584854707001322-main.pdf: 690864 bytes, checksum: 6cae90d9e2b22aa7f047b40153e7924b (MD5) Previous issue date: 2007 High-resolution continuum source atomic absorption spectrometry (HR-CS AAS) has been used to investigate spectral and non-spectral interferences found with a conventional line source atomic absorption spectrometer in the determination of aluminum in pharmaceutical products containing elevated iron and sugar concentrations. A transversely heated graphite furnace was used as the atomizer in both spectrometers. The two most sensitive aluminum lines at 309.3 nm and 396.2 nm were investigated and it was found that an iron absorption line at 309.278 nm, in the vicinity of the aluminum line at 309.271 nm, could be responsible for some spectral interference. The simultaneous presence of iron and the organic components of the matrix were responsible for radiation scattering, causing high continuous and also structured background absorption at both wavelengths. The aluminum and iron absorption could not be separated in time, i.e., the iron interference could not be eliminated by optimizing the graphite furnace temperature program. However, an interference-free determination of aluminum was possible carrying out the measurements with HR-CS AAS at 396.152 nm after applying least squares background correction for the elimination of the structured background. Analytical working range and other figures of merit were determined and are presented for both wavelengths using peak volume registration (center pixel ± 1) and the center pixel only. Limits of detection and characteristic masses ranged from 1.1 to 2.5 pg and 13 to 43 pg, respectively. The method was used for the determination of the aluminum contamination in pharmaceutical formulations for iron deficiency treatment, which present iron concentrations from 10 to 50 g l− 1. Spike recoveries from 89% to 105% show that the proposed method can be satisfactorily used for the quality control of these formulations.

Published
2007
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27. Investigation of the feasibility to use Zeeman-effect background correction for the graphite furnace determination of phosphorus using high-resolution continuum source atomic absorption spectrometry as a diagnostic tool

Author

Lepri, Fábio G., primary, Welz, Bernhard, additional, Dessuy, Morgana B., additional, Vale, Maria Goreti R., additional, Bohrer, Denise, additional, de Loos-Vollebregt, Margaretha T.C., additional, Huang, Mao Dong, additional, and Becker-Ross, Helmut, additional

Published
2010
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