1.

In the quantitative analysis of a particular crystalline phase which of the following material is used as an internal standard?

A. β-Al<sub>2</sub>O<sub>3</sub>
B. α-B<sub>2</sub>O<sub>5</sub>
C. β-B<sub>2</sub>O<sub>5</sub>
D. α-Al<sub>2</sub>O<sub>3</sub>
Answer» E.


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