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

•Rapid determination of humic acid content in fertilizer by headspace GC.•This method is based on the oxidation of humic acid in strong acidic medium.•The CO2 formed from the oxidation is measured by headapace GC.•This approach presents a practical tool for the humic acid estimation in fertilizer. A...

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Bibliographic Details
Published in:Journal of Chromatography A 2019-07, Vol.1596, p.194-198
Main Authors: Xie, Wei-Qi, Gong, Yi-Xian, Yu, Kong-Xian
Format: Article
Language:English
Subjects:
Fertilizer
Gas chromatography
Headspace
Humic acids
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Summary:•Rapid determination of humic acid content in fertilizer by headspace GC.•This method is based on the oxidation of humic acid in strong acidic medium.•The CO2 formed from the oxidation is measured by headapace GC.•This approach presents a practical tool for the humic acid estimation in fertilizer. 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.
ISSN:0021-9673
DOI:10.1016/j.chroma.2019.03.027