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Determination of aromatic acids in terephthalic acid wastewater by ultra-performance liquid chromatography/ultraviolet detection
LIU ChuangJi;DU ZhenXia
Journal of Beijing University of Chemical Technology ›› 2009, Vol. 36 ›› Issue (4) : 29-32.
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PDF(873 KB)
Determination of aromatic acids in terephthalic acid wastewater by ultra-performance liquid chromatography/ultraviolet detection
An ultra-performance liquid chromatographic (UPLC) method has been developed for the determination of the six aromatic acids (o-phthalic acid, terephthalic acid, 3-carboxybenzaldehyde, m-phthalic acid, benzoic acid and m-toluic acid) in the wastewater discharged from a plant producing terephthalic acid. Analyses were performed using a Waters Acquity BEH C18 column (2.1mm×50mm, 1.7μm). A three-component mobile phase (methanol, water, formic acid) was used for gradient elution, and ultraviolet detection was performed at 254nm. The external standard method was employed. The linear range was 0.5-100μg/mL (with terephthalic acid in the range 0.25-50μg/mL).The correlation coefficients were all more than 0.9998. The inter-day relative standard deviations (RSD) of the six aromatic acids in three groups of samples were less than 1.5% (n=3). The mean standard recoveries of the six aromatic acids were between 80% and 110%, and RSD values were less than 6% (n=3), showing that the repeatability of the UPLC method is acceptable.
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