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ISO 8658:1997 Carbonaceous materials for use in the production of aluminium -- Green and calcined coke -- Determination of trace elements by flame atomic absorption spectrometry
standard by International Organization for Standardization, 04/01/1997
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This international Standard describes a method for the determination of trace elements in green and calcined coke with an ash content of not greater than 1 % (m/m) and with individual concentrations not greater than the following:
| Calcium | 0,025 % (m/m) |
| Chromium | 0,005 % (m/m) |
| Copper | 0,025 % (m/m) |
| Iron | 0,030 % (m/m) |
| Lead | 0,010 % (m/m) |
| Magnesium | 0,010 % (m/m) |
| Manganese | 0,001 % (m/m) |
| Nickel | 0,050 % (m/m) |
| Silicon | 0,100 % (m/m) |
| Vanadium | 0,100 % (m/m) |
| Zinc | 0,004 % (m/m) |