Synthesis and use of novel thorium color developing reagent metafluoro azo fluorophosphine

A chromogenic agent and fluoroazo technology, applied in the field of organic reagent synthesis and application, can solve the problems of expensive instruments, cannot be popularized, and the performance of reagents needs to be further improved, so as to shorten the reaction time, improve the selectivity, and improve the complexation reaction. performance effect

Inactive Publication Date: 2003-10-22
EAST CHINA NORMAL UNIV
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AI Technical Summary

Problems solved by technology

Determination of harmful element thorium (IV) by atomic absorption method is not popular because of expensive instruments
Color-changing acid chromo

Method used

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Embodiment Construction

[0033] The synthesis method involved in the invention is particularly suitable for the synthesis of thorium chromogen m-fluoroazofluorophosphine, and the product of the synthesis method is suitable for photometric analysis of harmful element thorium (IV).

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Abstract

The present invention relates to a new thorium developer metafluoroazophosphon and its synthesis and application. Said invented synthesis method adopts the reaction steps of nitrating hydrolysis, direct reduction phosphonation and diazo coupling to obtain metafluoroazophosphon crude product, then utilizes the processes of acidification purification and paper chromatography using 25% ammonia water: 5% sodium citrate=2:5 as developing agent to obtain the pure product. By introducing surfactant CPB in the photometric analysis and determination of thorium (IV) said system is purified by adopting n-butanol, it has the obvious sensitivity-enhancing effect, and has high sensitivity and selectivity, and has a certain applicable value in fields of environment and food analysis.

Description

technical field [0001] The present invention relates to a new thorium chromogen m-fluoroazofluorophosphine, specifically, to [2-(5-fluoro-2-phosphonophenylazo)-7-(3-fluorophenylazo) The synthesis and application of -1-8-dihydroxy-3,6-naphthalene disulfonic acid] belong to the technical field of organic reagent synthesis and application. Background technique [0002] Meta-fluoroazofluorophosphine belongs to fluorine-containing color-changing acid color developer, and the synthesis and application of fluorine-containing color-changing acid color developer has attracted increasing attention. The current report has "Research on the Color Reaction Performance of Asymmetric Chromotropic Acid Disazo Reagents Containing Fluorine Substituents and Metal Ions" [Luo Qingyao, Yu Ximao, Zeng Yunhe, Chemical Reagents, 1993, 15(5): 262-267]. The involved synthetic reagent is based on the chlorophosphine azo I, introducing fluorine-containing multi-halogen substituents...

Claims

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Application Information

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IPC IPC(8): C07F9/38
Inventor 吴斌才王冰
Owner EAST CHINA NORMAL UNIV
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