Spectrophotometric assay of a wood preservative, <Emphasis Type="Italic">N,N</Emphasis>-didecyl-<Emphasis Type="Italic">N</Emphasis>-methylpoly(oxyethyl) ammonium propionate (DMPAP), in aqueous solution |
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Authors: | Ikuo Momohara Wakako Ohmura |
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Institution: | (1) Forestry and Forest Products Research Institute, Matsunosato, Tsukuba 305-8687, Japan |
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Abstract: | A spectrophotometric assay based on the color reaction between N,N-didecyl-N-methyl-poly(oxyethyl) ammonium propionate (DMPAP) and 4-4-(dipropylamino) phenylazo]-benzenesulfonic acid (propyl orange)
was used to determine DMPAP concentrations as a wood preservative. The assay was carried out using a propyl orange solution
at pH 2.9. The visible absorption spectrum of propyl orange showed an absorption maximum at 510 nm, which decreased linearly
with increasing DMPAP concentration from 0 to 10 ppm. To apply this assay method to determine DMPAP retention in treated wood,
the influence of wood extractives on the assay was investigated. Extractives from Japanese cedar, hinoki cypress, and Japanese
larch were found to increase apparent DMPAP concentration. However, it was also found that measuring visible absorption at
477 nm prevented overestimation and gave precise values. This assay can be a viable alternative to the current methods for
the determination of DMPAP concentrations. |
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Keywords: | |
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