Answer Posted / devendrakumar

1. caffeine easily available in market.
2. In general we all use caffeine as a standard for
calibration of HPLC specially for (Calibration of Wave
Length Accuracy) since it will scan the whole of the UV
range i.e It gives a multiwavelength response like
first maxima at 205 nm
second maxima at 273 nm &
minima at 245nm
3. It is very stable, we can use a long time for analysis
i.e. it is not degradable
4. In this case we can use Erbium Perchlorate which will
scan the whole range(200 nm to 600 nm).It is stable and
little costly but not easily available in market.


d.devendrakumar

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