The Oxidation Colour Reaction of the New Colour Reagent 2,3,7-Trihydroxy-9-dibromo-hydroxyphenyi fluorone and Determination of Cr in Waste Water by Dual-Wavelength Spectrophotometry

Chem. J. Chinese Universities ›› 1993, Vol. 14 ›› Issue (4): 486.

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The Oxidation Colour Reaction of the New Colour Reagent 2,3,7-Trihydroxy-9-dibromo-hydroxyphenyi fluorone and Determination of Cr in Waste Water by Dual-Wavelength Spectrophotometry

OU Zhong-Ping¹, LU Xia², PAN Jiao-Mai³

1. Department of Chemistry, Nanjing Normal University;
2. Department of Chenustry, Nantong Teachers College;
3. Department of Chemistry.East China Normal Uiversity, Shanghai, 200062

Received:1992-05-23 Revised:1992-10-12 Online:1993-04-24 Published:1993-04-24

Abstract

Abstract: The colour reaction between Cr and the new colour reagent 2, 3, 7-trihydroxy-9-dibromo-hydroxyphenyl fluorone was studied by spectrophotometry and potentiometric tilration.It is found that the colour reaction between Cr and the colour reagent (DBHPF) is an oxidation colour reaction in both weak and strong acid media, Based on this colour reaction, a dual-wavelength spectrophotometry for the determination of Cr has been established.Cr(Ⅵ) and total Cr in waste water had been determined by this method.The results and the recovery are satisfactory.

Key words: Oxidation colour reaction,2,3,4-Trihydroxy-9-dibromo-hydroxyphenyitluorone, Dual-wavelength spectrophotometry, Waste water, Cr

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OU Zhong-Ping, LU Xia, PAN Jiao-Mai. The Oxidation Colour Reaction of the New Colour Reagent 2,3,7-Trihydroxy-9-dibromo-hydroxyphenyi fluorone and Determination of Cr in Waste Water by Dual-Wavelength Spectrophotometry[J]. Chem. J. Chinese Universities, 1993, 14(4): 486.

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The Oxidation Colour Reaction of the New Colour Reagent 2,3,7-Trihydroxy-9-dibromo-hydroxyphenyi fluorone and Determination of Cr in Waste Water by Dual-Wavelength Spectrophotometry

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