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assaying

assaying (əsā´yĬng, ăs´āyĬng), in metallurgy, process of determining the specific metallic content of an ore, alloy, or other substance, especially one containing precious metals. It consists, in some cases, of subjecting the substance to complete chemical analysis and, in others, of simply determining the quantity present of one or more of the metal constituents. An accurate assay depends first upon procuring a representative sample of the ore in question. Since distribution of the ore's components is not uniform, a common method employed in obtaining this sample is to procure several samples, crush and mix them together, and from the final mass take the sample to be assayed. Assays are said to be gravimetric when the weight of the metal is determined and volumetric when the analysis involves the volume of the metal in solution as compared to that in a standardized solution. A wet assay (one which involves the use of liquid reagents) is generally used in a determination of weight. In a dry assay the ore is fused and the metal is finally obtained in a pure state.

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assay

as·say / ˈaˌsā; aˈsā/ • n. the testing of a metal or ore to determine its ingredients and quality: submission of plate for assay. ∎  a procedure for measuring the biochemical or immunological activity of a sample: each assay was performed in duplicate. • v. [tr.] 1. determine the content or quality of (a metal or ore). ∎  determine the biochemical or immunological activity of (a sample): cell contents were assayed for enzyme activity. ∎  examine (something) in order to assess its nature: stepping inside, I quickly assayed the clientele. 2. archaic attempt: I assayed a little joke of mine on him. DERIVATIVES: as·say·er n.

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assay

assay the testing of a metal or ore to determine its ingredients and quality. The word is recorded from Middle English, in the general sense ‘testing, or a test of, the merit of someone or something’, and comes ultimately from Old French essai ‘trial’.

In the UK, the assay office is an institution authorized to award hallmarks to articles made from precious metals. There are currently four in Britain, at London, Birmingham, Sheffield, and Edinburgh.

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assay

assay Test to determine the amount of a metal present in a sample of material such as ores and alloys. The term is normally reserved for finding the proportion of gold, silver or platinum present. See also hallmark

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assay

assay trial (gen. and spec., now only of metals). XIV. — OF. assai, var. of essai ESSAY.
So assay vb. XIV. — OF. assaier.

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assay

assay The analysis of minerals and mine products to determine the concentrations of their components.

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assay

assayaffray, agley, aka, allay, Angers, A-OK, appellation contrôlée, array, assay, astray, au fait, auto-da-fé, away, aweigh, aye, bay, belay, betray, bey, Bombay, Bordet, boulevardier, bouquet, brae, bray, café au lait, Carné, cassoulet, Cathay, chassé, chevet, chez, chiné, clay, convey, Cray, crème brûlée, crudités, cuvée, cy-pres, day, decay, deejay, dégagé, distinguée, downplay, dray, Dufay, Dushanbe, eh, embay, engagé, essay, everyday, faraway, fay, fey, flay, fray, Frey, fromage frais, gainsay, gay, Gaye, Genet, gilet, glissé, gray, grey, halfway, hay, heigh, hey, hooray, Hubei, Hué, hurray, inveigh, jay, jeunesse dorée, José, Kay, Kaye, Klee, Kray, Lae, lay, lei, Littré, Lough Neagh, lwei, Mae, maguey, Malay, Mallarmé, Mandalay, Marseilles, may, midday, midway, mislay, misplay, Monterrey, Na-Dene, nay, né, née, neigh, Ney, noway, obey, O'Dea, okay, olé, outlay, outplay, outstay, outweigh, oyez, part-way, pay, Pei, per se, pince-nez, play, portray, pray, prey, purvey, qua, Quai d'Orsay, Rae, rangé, ray, re, reflet, relevé, roman-à-clef, Santa Fé, say, sei, Shar Pei, shay, slay, sleigh, sley, spae, spay, Spey, splay, spray, stay, straightaway, straightway, strathspey, stray, Sui, survey, sway, Taipei, Tay, they, today, tokay, Torbay, Tournai, trait, tray, trey, two-way, ukiyo-e, underlay, way, waylay, Wei, weigh, wey, Whangarei, whey, yea

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