Answer / prasad

Because Only holmium can give sharp peaks in both UV and
Vis range, Sharp peak is very rare in UV/Vis spectroscopy.
It is very stable and doesn't absorb light at lower
wavelength.

Answer / vimal

IN THE PARAMETER OF CONTROL OF WAVELENTH
ONLY HOLMIUM OXIDE CAN GIVE ALL PEAKS
AT PERTICULAR WAVELENTH IN BETWN 200 NM TO 600 NM.

Answer / deepak

holmium oxide in perchloric acid solution gives very sharp
peaks in the range 200 nm to 900 nm. and hence is used as a
calibration standard.

Answer / ragni vora

this is because holmium oxide and perchloric acid does not absorb uv/vis i.e. it is transparent to uv/vis region hence it can also be used as an background

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3 Answers  

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