STN 72 2041-11
Name: | STN 72 2041-11 |
Validity: | Valid |
Number of pages: | 4 |
Language: |
CS
|
Paper: | 2,80€ |
Electronic version |
a) Only read (without ability to print and copy)
2,52€ b) Without ability to print, with ability to copy (printscreen) 2,80€ c) With ability to print and copy (printscreen) 3,64€ |
Slovak title | Chemický rozbor oceliarskej trosky. Časť 11: Stanovenie celkového železa bez použitia ortuťnatých solí |
English title | Chemical analysis of steel-making slag. Determination of total iron content without the use of mercury salts |
Release Date: | 01. 08. 1992 |
Date of withdrawal: | |
ICS: | 71.040.40, 91.100.15, 91.100.20 |
Sorting character/National clasification code | 72 2041 |
Level of incorporation: | |
Official Journal | 08/92 |
Amendments | |
Replaced by: | |
Repleces: | |
Note in Official Journal: | |
Subject of the standard: | Tato norma urcuje titracni metodu pro stanoveni celkoveho obsahu zeleza. Vzorek se rozlozi smesi kyseliny chlorovodikove s kyselinou fluorovodikovou a po oxidaci peroxidem vodiku se odparenim roztoku s kyselinou chloristou odstrani kremik. Pak se odstrani chrom ve forme chloridu chromylu, pripadny nerozlozeny zbytek se dotavi s disiranem sodnym a po rozpusteni taveniny se pripoji k puvodnimu roztoku. po uprave kyselosti se zelezite soli titruji odmernym roztokem kyseliny askorbove na kyselinu sulfosalicylovou jako indikator. Metoda je vhodna pro stanoveni zeleza ve vzorcich s obsahem molybdenu do 0,2 |procenta|. |