A potentiometric study on the complexes of His,Gly-His,ALa-His,Gly-Gly and Gly—Gly—Gly with Zn(Ⅱ)and Cd(Ⅱ)has been reported.Small-scale potentiometric titrations were car- ried out to determine stabil ity constant...A potentiometric study on the complexes of His,Gly-His,ALa-His,Gly-Gly and Gly—Gly—Gly with Zn(Ⅱ)and Cd(Ⅱ)has been reported.Small-scale potentiometric titrations were car- ried out to determine stabil ity constants of complexes at 25℃ with I=0.10 mol dm^(-3)(KNO_3).The com- puter programs SUPERQUAD were applied for data treatment with satisfactory results.展开更多
Daomanite is a new mineral recently discovered in northern China. Its composition has been repeatedly analyzed by means of electron microprobe technique, the chemical formula being determined as PtCuAsS2 which is a ki...Daomanite is a new mineral recently discovered in northern China. Its composition has been repeatedly analyzed by means of electron microprobe technique, the chemical formula being determined as PtCuAsS2 which is a kind of sulfur-arsenic compound scarcely known. Its crystal structure has also been made by X-ray diffraction method on single crystal.展开更多
The method generally employed to test the heavy water product is pycnometry, and the density value found is corrected after having performed the mass spectrometric analysis of the oxygen isotopes. This has been checke...The method generally employed to test the heavy water product is pycnometry, and the density value found is corrected after having performed the mass spectrometric analysis of the oxygen isotopes. This has been checked in our laboratory, and the accuracy found is ±0.02 atom％ D. Another method is to determine the con-展开更多
Coal is now still the main energy resource in China. But the burning of this fossil fuel is also a major source of air pollution. Thus it is quite obvious that an accurate knowledge of the elements, including the trac...Coal is now still the main energy resource in China. But the burning of this fossil fuel is also a major source of air pollution. Thus it is quite obvious that an accurate knowledge of the elements, including the trace ones. of coal is important. But to secure such a knowledge, reliable determination techniques are needed. To test the accuracy of analytical methods and quality control for the determination of the composition of coal and flyash, there is an obvious need for some environmental standard reference materials. Recently the U.S. National Bureau of Standards has announced such a material, coal (SRM-1632a).展开更多
A ring-oven method for the determination of mercury at sub-nanogram amount levels is described, Mercury is bound as Cu2Hg I4 and Rh3+ by spotting the sample on a filter paper impregnated with HI-H2SO3.
20030165 Chen Jinyang (Department of Geology, Peking University, Beijing); Zheng Haifei Raman Spectroscopic Study on Hydrogen Bond of Water Molecules in Synthetic Inclusions under High Temperature (Rock and Mineral An...20030165 Chen Jinyang (Department of Geology, Peking University, Beijing); Zheng Haifei Raman Spectroscopic Study on Hydrogen Bond of Water Molecules in Synthetic Inclusions under High Temperature (Rock and Mineral Analysis, ISSN0254-5357, CN 11-2131/TD, 21(3), 2002, p. 166-170, 4 illus. , 2 tables, 21 refs. )展开更多
文摘A potentiometric study on the complexes of His,Gly-His,ALa-His,Gly-Gly and Gly—Gly—Gly with Zn(Ⅱ)and Cd(Ⅱ)has been reported.Small-scale potentiometric titrations were car- ried out to determine stabil ity constants of complexes at 25℃ with I=0.10 mol dm^(-3)(KNO_3).The com- puter programs SUPERQUAD were applied for data treatment with satisfactory results.
文摘Daomanite is a new mineral recently discovered in northern China. Its composition has been repeatedly analyzed by means of electron microprobe technique, the chemical formula being determined as PtCuAsS2 which is a kind of sulfur-arsenic compound scarcely known. Its crystal structure has also been made by X-ray diffraction method on single crystal.
文摘The method generally employed to test the heavy water product is pycnometry, and the density value found is corrected after having performed the mass spectrometric analysis of the oxygen isotopes. This has been checked in our laboratory, and the accuracy found is ±0.02 atom％ D. Another method is to determine the con-
文摘Coal is now still the main energy resource in China. But the burning of this fossil fuel is also a major source of air pollution. Thus it is quite obvious that an accurate knowledge of the elements, including the trace ones. of coal is important. But to secure such a knowledge, reliable determination techniques are needed. To test the accuracy of analytical methods and quality control for the determination of the composition of coal and flyash, there is an obvious need for some environmental standard reference materials. Recently the U.S. National Bureau of Standards has announced such a material, coal (SRM-1632a).
文摘A ring-oven method for the determination of mercury at sub-nanogram amount levels is described, Mercury is bound as Cu2Hg I4 and Rh3+ by spotting the sample on a filter paper impregnated with HI-H2SO3.
文摘20030165 Chen Jinyang (Department of Geology, Peking University, Beijing); Zheng Haifei Raman Spectroscopic Study on Hydrogen Bond of Water Molecules in Synthetic Inclusions under High Temperature (Rock and Mineral Analysis, ISSN0254-5357, CN 11-2131/TD, 21(3), 2002, p. 166-170, 4 illus. , 2 tables, 21 refs. )
