why we are using k2cr207 in uv calibration ? why we r not using kmno4?

why we are using k2cr207 in uv calibration ? why we r not
using kmno4?

Question Posted / vijay

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why we are using k2cr207 in uv calibration ? why we r not using kmno4?..

Answer / rajender

potassium dichromate(130 centigrade 2 hrs drying) is a primary standard and it does not degrades upon longterm exposure to U.V , it appears in multiple wavelength regions

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