搜索结果: 1-11 共查到“知识库 化学 elements”相关记录11条 . 查询时间(0.233 秒)
On the Continuity of Reference of the Elements. A Response to Hendry.
chemistry causal theory reference element Dalton
2011/9/7
Robin Hendry has recently argued that although the term ‘element’ has traditionally been used in two different senses, (basic substance and simple substance), there has nonetheless been a continuity o...
Determination of Rare Earth Elements (REEs) in Airborne Particulate Matter (APM) Collected in Tokyo, Japan, and a Positive Anomaly of Europium and Terbium
-Rare Earth Elements Airborne Particulate Matter Tokyo
2010/9/17
The determination of rare earth elements (REEs) in airborne particulate matter (APM) was conducted, and the distribution pattern of atmospheric REEs was evaluated in this study. The APM was collected ...
Modification of a Porous Sheet (MAPS) for the High-Performance Solid-Phase Extraction of Trace and Ultratrace Elements by Radiation-Induced Graft Polymerization
Modification Porous Sheet High-Performance Solid-Phase Extraction Trace Ultratrace Elements Radiation-Induced Graft Polymerization
2010/9/13
In this review, the preparation of a novel porous sheet designed for solid-phase extraction (SPE) and a comparison of the preconcentration performance of metal ions with conventional sorbents are des...
Statistical Analysis of Rice Samples for Compositions of Multiple Light Elements (H, C, N, and O) and Their Stable Isotopes
Rice Samples Compositions of Multiple Light Elements
2010/9/15
Stable isotopic compositions and elemental contents of the H, C, N, and O in 163 rice samples were analyzed. The samples were taken from three different farming countries; Japan (n = 103), United Stat...
Interference elimination studies during the determination of trace elements in cow liver using differential pulse polarography
Liver trace elements determination polarographic
2010/10/14
The liver is known to accumulate many trace elements; thus it is very important to determine their level in a sensitive way. The objective of this study was to develop a simple method for the simultan...
Quantitative Estimation Methods for Concentrations and Layer Thicknesses of Elements Using Edge-jump Ratios of X-ray Absorption Spectra
Quantitative Estimation Methods Concentrations Layer Thicknesses Elements Using Edge-jump Ratios of X-ray Absorption Spectra
2010/9/17
This work concerns the development of quantitative estimation techniques using the K edge-jump ratio of X-ray absorption spectrum recorded through total-electron-yield measurements. The three methods ...
Determination of the host phase of rare earth elements in natural carbonate using X-ray absorption near-edge structure
rare earth elements yttrium XANES carbonate
2017/8/9
The Y K-edge X-ray absorption near-edge structure (XANES) spectra of various materials were measured to investigate whether rare earth elements (REEs) are incorporated in carbonate phase or in other m...
Extraction chromatographic separation of platinum(IV) from real samples and associated elements
extraction chromatography mutual separations platinum(IV) palladium(II) gold(III)
2010/3/30
The extraction behavior of platinum(IV) was studied with N-n-octylaniline as a function of different parameters, such as pH, concentrations of weak acids, mineral acids, reagents and elution time. A s...
Preconcentration of Trace Elements on Amberlite XAD-4 Resin Functionalised with 1,2-bis (o-aminophenylthio) Ethane and Their Determination by FAAS in Environmental Samples
Water trace element preconcentration Amberlite XAD-4 FAAS 1 2-bis (o-aminophenylthio) ethane chelating resin
2010/4/8
The use of chemically modified XAD-4-1,2-bis (o-aminophenylthio) ethane chelating resin for preconcentrating Cr6+, Mn2+, Fe3+, Co2+, Cu2+, Cd2+, Zn2+, Pb2+, and Ni2+ was studied using flame atomic abs...
The Effect of Acid Digestion on the Recoveries of Trace Elements: Recommended Policies for the Elimination of Losses
Open wet digestion losses recovery elimination trace elements differential pulse polarography
2010/4/19
Digestion of biological materials is very important for trace element determinations. Although the microwave technique is mostly used, there are cases where open wet digestion is needed. This study ex...
13C-and 31P-NMR Study of Tetracarbonylbis(diphenylphosphino)alkanemetal(0) Complexes of The Group 6 Elements
Chromium Molybdenum Tungsten Carbonyl Diphosphine NMR
2010/6/29
Tetracarbonylbis(diphenylphosphino)alkanemetal(0) complexes of the general formula M(CO)4[(C6H5)2P (CH2)nP(C6H5)2] (M: Cr, Mo, W; n: 1, 2, 3) were synthesized from the reaction of M(CO)4(h2:2-1,5-cycl...