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Standard ČSN 441742 11.4.1988 preview

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ČSN 441742 (441742)

Copper ores and concentrates. Cobalt determination



STANDARD published on 11.4.1988


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The information about the standard:

Designation standards: ČSN 441742
Classification mark: 441742
Catalog number: 28362
Publication date standards: 11.4.1988
SKU: NS-128831
The number of pages: 8
Approximate weight : 24 g (0.05 lbs)
Country: Czech technical standard
Category: Technical standards ČSN

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The category - similar standards:

Metalliferous minerals

Annotation of standard text ČSN 441742 (441742):

Norma platí pro chemický rozbor měděných rud a koncentrátů a určuje pro stanovení kobaltu metody: fotometrickou - pro hmotnostní zlomek kobaltu nad 0,005 % a atomové absorpční spektrometrie (AAS) - pro hmotnostní zlomek kobaltu od 0,01 % do 0,2%. Při provádění rozboru musí být dodržena všechna ustanovení podle ČSN 44 1701. Podstata fotometrické metody: Vzorek se rozloží kyselinami, rušivé prvky se oddělí elektrolýzou se rtuťovou katodou a kobalt se stanoví fotometricky s nitroso-R-solí. Podstata metody atomové absorpční spektrometrie: Vzorek se rozloží kyselinami, po odstranění oxidu křemičitého a dotavení nerozpustného zbytku v prostředí kyseliny chlorovodíkové se změří atomová absorpce kobaltu v plameni vzduch - acetylen při vlnové délce 240,7 nm. Postup při provádění obou normalizovaných zkoušek je podrobně popsán. ČSN 44 1742 byla schválena 11.4.1988 a nabyla účinnosti od 1.5.1989. Nahradila ČSN 44 1670 z 11.8.1971 v části II oddíl T a spolu s ČSN 44 1701, ČSN 44 1740, ČSN 44 1741, ČSN 44 1743 až ČSN 44 1759 ji nahradila v celém rozsahu

Preview of the standard ČSN 441742 (441742)

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ČSN 441771ČSN 441771

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