Determination of Trace Phosphorus in Different Systems and Its Application in Valence Transformation of Phosphorus

化学工业与工程

Chemcial Industry and Engineering

2020, Vol. 37

Issue (6) :54-60 DOI: 10.13353/j.issn.1004.9533.20191912

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Determination of Trace Phosphorus in Different Systems and Its Application in Valence Transformation of Phosphorus

Bi Mingyang, Huang Guoqiang

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China

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Abstract In order to detect trace phosphorus in a similar system of trichlorosilane, a UV-visible spectrophotometric method was proposed for the determination of phosphorus in different valences in aqueous and organic solutions. Phosphorus was extracted and separated from organic solvents with high purity water. The proposed method was used to determine the oxidation effect of PCl₃ in n-hexane. The detection range of phosphoric acid in aqueous solution is 0.52-6.40 μmol/L, and the detection limit is 0.52 μmol/L, while the detection range of phosphorous acid in aqueous solution is 1.60-6.40 μmol/L, and the detection limit is 1.60 μmol/L. At different volume ratios of n-hexane to water, the adjusted coefficient of determination of the fitting curve between the extraction rate and the initial concentration is above 0.95. It was determined that the oxidation rate of chromium(Ⅵ)-supported polymer to PCl₃ at a fixed bed temperature of 95℃ for 30 minutes could reach 26.5%.

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	Bi Mingyang
	Huang Guoqiang

Keywords： phosphorus； oxidation； support； polymers； trace detection； extraction

Received 2019-09-23;

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Bi Mingyang, Huang Guoqiang.Determination of Trace Phosphorus in Different Systems and Its Application in Valence Transformation of Phosphorus[J] Chemcial Industry and Engineering, 2020,V37(6): 54-60

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