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Issue 47, 2019
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High-throughput determination of the organic matter content in soil and municipal sludge by headspace gas chromatography

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Abstract

This paper reports on a new method for rapid determination of organic matter (OM) in soil and municipal sludge samples, based on a redox reaction (i.e., conversion of OM into CO2 by dichromate), involving the headspace gas chromatographic technique (HS-GC). For the soil samples (with a lower OM content), the sample reaction was conducted in a sealed headspace vial under the given conditions (135 °C for 20 min) and the CO2 from the reaction is directly measured by HS-GC. For the municipal sludge samples (i.e., with a higher OM content), the sample reaction was conducted in an open vial under the above conditions. Then, a portion of the reaction medium was taken and added into a sealed vial containing an excess amount of oxalic acid, followed by HS-GC measurement, from which the residual amount of potassium dichromate in the reaction medium can be determined and thus the OM content in the sample can be calculated. The results showed that the present method has good reproducibility and accuracy, with a relative standard deviation < 5% and recovery between 91.8% and 106%. Based on a headspace auto-sampler, high-throughput determination of the OM content for batch sample analysis can be realized.

Graphical abstract: High-throughput determination of the organic matter content in soil and municipal sludge by headspace gas chromatography

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Publication details

The article was received on 02 Sep 2019, accepted on 30 Oct 2019 and first published on 20 Nov 2019


Article type: Paper
DOI: 10.1039/C9AY01889A
Anal. Methods, 2019,11, 5963-5968

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    High-throughput determination of the organic matter content in soil and municipal sludge by headspace gas chromatography

    X. Tu, Z. Hu, T. Zhao, X. Chai, J. Wang and G. Chen, Anal. Methods, 2019, 11, 5963
    DOI: 10.1039/C9AY01889A

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