Richard S. Hunter has written:

'Photoelectric tristimulus colorimetry with three filters' -- subject(s): Colorimetry, Photoelectric cells

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G. J. Chamberlin has written:

'Visual aids to the teaching of colour and colorimetry and colorimetric analysis' -- subject(s): Analysis, Audio-visual aids, Color, Colorimetry, Colors

'The C.I.E. international colour system explained'

Chemists will use colorimetry to determine various states of chemicals in solution. The equipment has many uses.

It can be if you can convert the citric acid to a chromophore, i.e., something that is colored. Otherwise, you cannot.