- 行业: Printing & publishing
- Number of terms: 178089
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- Company Profile:
McGraw Hill Financial, Inc. is an American publicly traded corporation headquartered in Rockefeller Center in New York City. Its primary areas of business are financial, publishing, and business services.
In the separation of mixtures by paper chromatography or thin-layer chromatography, the production of colored derivatives of the solutes by spraying the stationary phase with selective reagents in order to establish the location of individual substances.
Industry:Chemistry
A method of chemical analysis that bases characterization completely on standards defined in terms of physical properties.
Industry:Chemistry
In a gas chromatogram (plot of eluent rise and fall versus time), the width of the base (time duration) of a symmetrical peak (rise and fall) of eluent.
Industry:Chemistry
Apparatus to measure the change in the dielectric constant of gases or gas mixtures; used as a detector in gas chromatographs to sense changes in carrier gas.
Industry:Chemistry
1. An instrument equipped with a filter system or other simple dispersing system to measure the absorption of nearly monochromatic radiation in the visible range by a gas or a liquid, and so determine the concentration of the absorbing constituents in the gas or liquid. 2. A device for regulating the thickness of a liquid in spectrophotometry.
Industry:Chemistry
Glass spheres coated with a thin layer of ion-exchange resin, used in liquid chromatography.
Industry:Chemistry
Apparatus for precise and simultaneous measurement of both the boiling temperature of a liquid and the condensation temperature of the vapors of the boiling liquid.
Industry:Chemistry
Chemical analysis of a gas or a liquid by measurement of the peak electromagnetic absorption wavelengths that are unique to a specific material or element.
Industry:Chemistry
Insoluble matter that can be separated from used lubricating oil in solution in n-pentane; may include resinous bitumens produced from the oxidation of oil and fuel; used in an American Society for Testing and Material test.
Industry:Chemistry
Technique of polarographic analysis which measures the difference in current flowing between two identical dropping-mercury electrodes at the same potential but in different solutions.
Industry:Chemistry
