| 摘要 |
<p>The present invention relates to a method for determining the concentration of 4-carboxy benzaldehyde in a terephthalic acid composition, comprising a) reacting 4-carboxy benzaldehyde in the terephthalic acid composition with 2,4-dinitrophenylhydrazine to obtain 4-carboxy benzaldehyde 2,4-dinitrophenylhydrazone and b) determining the concentration of 4-carboxy benzaldehyde 2,4-dinitrophenylhydrazone.</p> |
