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Standard ČSN 441753 11.4.1988 preview

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ČSN 441753 (441753)

Copper ores and concentrates. Zinc determination



STANDARD published on 11.4.1988


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The information about the standard:

Designation standards: ČSN 441753
Classification mark: 441753
Catalog number: 28373
Publication date standards: 11.4.1988
SKU: NS-128842
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 441753 (441753):

Norma platí pro chemický rozbor měděných rud a koncentrátů a určuje pro stanovení zinku metody chelatometrickou - pro hmotnostní zlomek zinku nad 1 %. a atomové absorpční spektrometrie (AAS) pro hmotnostní zlomek zinku do 1 %. Při provádění rozboru musí být dodržena všechna ustanovení podle ČSN 44 1701. Podstata chelatometrické metody: Po rozkladu vzorku kyselinami se rušivé prvky oddělí ve formě síranu a měď srážením thiosíranem sodným. Zinek se titruje odměrným roztokem EDTA při pH 5,6 až 5,8 na xylenolovou oranž jako indikátor. Podstata metody atomové absorpční spektrometrie (AAS): Vzorek se rozloží kyselinami a zinek se stanoví atomovou absorpční spektrometrií v plameni vzduch - acetylen při vlnové délce 213,9 nm. Postupy při provádění normalizovaných zkoušek jsou podrobně popsány. ČSN 44 1753 byla schválena 11.4.1988 a nabyla účinnosti od 1.5.1989. Nahradila ČSN 44 1670 z 11.8.1971 v části II oddíly F a G a spolu s ČSN 44 1701, ČSN 44 1740 až ČSN 44 1752 a ČSN 44 1754 až ČSN 44 1759 ji nahradila v celém rozsahu

Preview of the standard ČSN 441753 (441753)

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