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Citation: LIU Lian-Wei, SUN Yan-Huaa, WANG Xiu-Feng. Determination of Trace Oxalic Acid in Natural Foodstuffs by Inhibition Kinetic Spectrophotometry[J]. Chinese Journal of Applied Chemistry, ;2004, 21(3): 316-318. shu

Determination of Trace Oxalic Acid in Natural Foodstuffs by Inhibition Kinetic Spectrophotometry

1.
a College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018;
2.
b College of Horticulture, Shandong Agricultural University, Taian 271018

Corresponding author: LIU Lian-Wei,
Received Date: 20 June 2003
Available Online: 30 September 2003
Fund Project: 国家科技攻关计划课题资助项目(2001BA503B04) (2001BA503B04)

It is well known that hydrogen peroxide in dilute H₂SO₄ solution discolorizes bromocresol purple, while oxalic acid can sensitively inhibit the discoloration reaction or slow the reaction rate. The kinetic beha-vior of the inhibition reaction has been investigated and a kinetic spectrometric method for determination of trace oxalic acid was developed with detection limit 2.8×10^-8 g/mL and the linear range of the determination was 0~8×10^-7 g/mL oxalic acid. ε₄₃₀=1.50×10⁵L/(mol·cm). The method has been satisfactorily applied to the determination of trace oxalic acid in fruits, greens and cereals.
- inhibition,
- kinetic-spectrophotometry,
- oxalic acid,
- fruit,
- greens,
- cereals,
- bromocresol purple
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