Assay

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Assay

Metal purity test to confirm that the metal meets the standards for trading on a commodities exchange (commodities exchange center).

Assay

To test precious metals for their purity. This is important to commodities and futures involving precious metals, in which the quality of the underlying metals must be specified in the contract.

assay

A test to determine the purity of gold, silver, or other precious metals. Metals used for delivery of futures contracts must be assayed to verify that they meet standards established by the exchange on which the contracts trade.
References in periodicals archive ?
The effect of pH, separately for with or without added saponin, on assayable RCF compared with 10 g/L AA, pH 2.
The effect of pH on assayable RCF was assessed by parametric one-way ANOVA and the least significant difference test.
With water as the diluent, the effect on assayable RCF (a) without saponin, (b) without saponin + freezing-thawing, and (c) with saponin was assessed by parametric one-way ANOVA and the least significant difference test.
Subsequent to erythrocyte hemolytitis in 1% AA, RCF is deconjugated with naturally occurring plasma folate conjugase enzyme, with reaction time being the only variable utilized, at any given temperature, to optimize assayable folate.
At this point, it may be pertinent to note that although AA technically has the ability to act as a prooxidant (especially in the presence of metal ions), the addition of AA to hemolysates has always resulted in an increase of assayable folate, thus ruling out the probability of it acting as a prooxidant in the context of erythrocyte folate analysis.
8) hemolysates had an assayable folate concentration 65% higher than AA-pH 6.