- 行业: Printing & publishing
- Number of terms: 178089
- Number of blossaries: 0
- 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.
A chromatographic procedure in which the rate of flow of the mobile phase is periodically changed.
Industry:Chemistry
A common qualitative test for the nitrate ion; a brown ring forms at the juncture of a dilute ferrous sulfate solution layered on top of concentrated sulfuric acid if the upper layer contains nitrate ion.
Industry:Chemistry
A titration characterized by the transfer of electrons from one substance to another (from the reductant to the oxidant) with the end point determined colorimetrically or potentiometrically.
Industry:Chemistry
A method of chemical analysis in which a sample, exposed to radiation of one wavelength, absorbs this radiation and reemits radiation of the same or longer wavelength in about 10_<sub>9</sub> second; the intensity of reemited radiation is almost directly proportional to the concentration of the fluorescing material. Also known as fluorescence analysis; fluorometry.
Industry:Chemistry
The taking of samples in arbitrary, irregular units rather than discrete units of uniform size for chemical analysis.
Industry:Chemistry
Preparation of one or more subsamples from a sample of material that is to be analyzed chemically.
Industry:Chemistry
Method for separating elements or compounds with similar solubilities by a series of analytical precipitations, each one improving the purity of the desired element.
Industry:Chemistry
In chemical analysis, a substance used to calibrate the response of a measurement system to the analyte.
Industry:Chemistry
A material or substance whose properties are sufficiently well established to be used in calibrating an apparatus, assessing a measurement method, or assigning values to other materials.
Industry:Chemistry
The space provided above the resin bed in an ion-exchange column to allow for expansion of the bed during backwashing.
Industry:Chemistry
