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. 2019 Dec 11;9(70):40961-40965.
doi: 10.1039/c9ra07228d. eCollection 2019 Dec 9.

Determination of total phosphorus in soil and sludge by an effective headspace gas chromatographic method

Yukai Zheng  1 , Weide Fu  1 , Rencheng Zhu  1 , Zhanbo Hu  1 , Gang Chen  2 , Xin-Sheng Chai  2
Affiliations

Determination of total phosphorus in soil and sludge by an effective headspace gas chromatographic method

Yukai Zheng et al. RSC Adv. .

Abstract

This paper reported a novel method for the determination of total phosphorus (TP) content in soil and sludge by a headspace gas chromatography (HS-GC) method. It was based on a reaction between the soluble phosphate in the digestion solution and calcium oxalate solid to form a calcium phosphate precipitate and release oxalate ions, which can react with permanganate to form carbon dioxide, which was then measured by HS-GC. The results showed the complete conversion of phosphate (meanwhile to free oxalate ions in calcium oxalate) in 15 min at 60 °C. The present method has good repeatability (RSD < 2.6%) and good accuracy (RD < 7.3%) compared to the reference method. Therefore, the present HS-GC method can become a more effective method for determining the TP content in soil and sludge samples.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. Effect of the pH on the conversion of phosphate.
Fig. 2
Fig. 2. Effects of the reaction temperature and time on the conversion of phosphate (for releasing oxalate ions from solid CaC2O4).
Fig. 3
Fig. 3. Effect of the equilibration temperature and time on the conversion of oxalate to CO2.
Fig. 4
Fig. 4. Relationship between TP concentration and the reciprocal of the GC signal for CO2.
Fig. 5
Fig. 5. Effect of the HRT on the TP concentration in excess sludge.
See this image and copyright information in PMC

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