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Releasing effects in flame photometry: Determination of calcium

Analytical Chemistry

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Abstract

Strontium, lanthanum, neodymium, samarium, and yttrium completely release the flame emission of calcium from the depressive effects of sulfate, phosphate, and aluminate. Magnesium, beryllium, barium, and scandium release most of the calcium emission. These cations, when present in high concentration, preferentially form compounds with the depressing anions when the solution is evaporated rapidly in the flame. The mechanism of the interference and releasing effects is explained on the basis of the chemical equilibria in the evaporating droplets of solution and is shown to depend upon the nature of the compounds present in the aqueous phase of the solution. The need for background correction techniques is stressed. The releasing effect is used in the determination of calcium in silicate rocks without the need for separations.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Releasing effects in flame photometry: Determination of calcium
Series title:
Analytical Chemistry
Volume
32
Issue:
11
Year Published:
1960
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Analytical Chemistry
First page:
1475
Last page:
1480
Number of Pages:
6