ASTM E 1243 : 1988
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Test Method for Columbium and Tantalum in Ores and Concentrates Involving Ion Exchange (Withdrawn 1993)
12-01-1993
12-31-2010
CONTAINED IN VOL 03.06 95 Determines columbium and tantalum in ores, concentrates, and slags containing a minimum of 1.5 % of columbium or tantalum or both.
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