Why we use holmium oxide,perchloric acid for uv/vis calibration

Cipla, Orchid, Ratiopharm,

why we use holmiumperchlorate in calibrating uv

Aurobindo, DRL, MSN Pharma,

Why using Holmium oxide in UV calibration

Dr Reddys, Matrix, Nakoda Chemicals, Orchid,

why r u using Holmium Oxide in UV calibration

IPCA, Reddy Labs,

why holmium perchloate solution in Uv calibration

Alembic,

In UV calibration we use Holmium perchlorate solution made in 1.4M perchloric acid The question is that 1.4 M perchloric acid we make is it in water or glacial acetic acid?

What is the use of Holmium (III) Oxide???

Finar Chemicals,