ABSTRACT: A spectrophotometric
method for the determination of oxalic acid has been developed, based on its
catalytic effect on the redox reaction
between methylene blue and sulphide, measured
at the maximum
absorption wavelength of
664 nm. Under the optimum
conditions of 3
mL of 31
% formaldehyde; 0.8 mL
of 0,067
M EDTA - Triethanolamine; 1.2 mL of 0,010 M
sulphide; 2 mL of 0,0010 % methylene blue at 20oC for 1 minute a
detection limit of 0,43 g/mL for oxalic
acid determination was obtained. This method can be applied to determination of
trace level of oxalic acid.
Keywords: spectrophotometry,
oxalic acid, methylene blue, sulphide
Penulis: Irmanto, Suyata
Kode Jurnal: jpkimiadd060021
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