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An efficient headspace gas chromatographic technique for determining humic acid content in fertilizer

Author:
Xie, Wei-Qi, Gong, Yi-Xian, Yu, Kong-Xian
Source:
Journal of chromatography 2019 v.1596 pp. 194-198
ISSN:
0021-9673
Subject:
carbon dioxide, fertilizers, gas chromatography, headspace analysis, humic acids, oxidation
Abstract:
A fast, convenient and commercially available approach for analyzing humic acid content in fertilizer using headspace gas chromatography (HS-GC) is presented in this paper. Humic acid is converted into carbon dioxide based on the oxidation of humic acid in strong acidic medium and can be measured via automatic HS-GC. Conditions for the alkaline extraction and the humic acid oxidation process are also optimized. The new technique proved to be precise (RSD ≤ 3.59%) and accurate (relative errors≤9.46% as compared with the spectrophotometric approach). The newly established technique presents a practical tool to routinely analyze humic acid content in fertilizer during the fertilizer production.
Agid:
6334780