isotope dilution

isotope dilution

      radiochemical method of analysis for measuring the mass and quantity of an element in a substance. The procedure involves adding to a substance a known quantity of a radioisotope of the element to be measured and mixing it with the stable isotope of the element. A sample is then taken from the mixture and analyzed. By measuring the amount of radioactive isotope and the amount of stable isotope present and determining the ratio of these amounts, both the quantity and mass of the element can be ascertained.

      Isotope dilution is employed chiefly in analytical chemistry in situations in which precise quantitative analysis by conventional means is difficult. Certain kinds of geophysical investigations also require its use, as in determining the occurrence and distribution of trace elements in rock samples and meteorites.

* * *

Universalium. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • isotope dilution — noun Any technique that involves the addition to a sample of an isotopically labelled compound. Syn: isotopic dilution …   Wiktionary

  • DILUTION ISOTOPIQUE — En essayant de séparer le radioplomb (Ra D) du plomb inactif dans un échantillon de plomb, G. de Hevesy s’aperçut que cette séparation était impossible à réaliser par les méthodes habituelles. Il eut l’idée d’utiliser le Ra D fortement dilué dans …   Encyclopédie Universelle

  • Isotopic dilution — is a technique to increase the precision and accuracy of chemical analysis. First, a known amount of an isotope is added to the sample. For example, to determine the amount of lead in a sample, a known amount of Pb 204, one of the isotopes of… …   Wikipedia

  • isotopic dilution — noun any technique that involves the addition to a sample of an isotopically labelled compound Syn: isotope dilution …   Wiktionary

  • ID-MS — isotope dilution mass spectrometry …   Medical dictionary

  • ID-MS — • isotope dilution mass spectrometry …   Dictionary of medical acronyms & abbreviations

  • dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …   Universalium

  • Dimethyltryptamine — Systematic (IUPAC) name 2 (1H indol 3 yl) N …   Wikipedia

  • analysis — /euh nal euh sis/, n., pl. analyses / seez /. 1. the separating of any material or abstract entity into its constituent elements (opposed to synthesis). 2. this process as a method of studying the nature of something or of determining its… …   Universalium

  • mass spectrometry — or mass spectroscopy Analytic technique by which chemical substances are identified by sorting gaseous ions by mass using electric and magnetic fields. A mass spectrometer uses electrical means to detect the sorted ions, while a mass spectrograph …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”