铝工业危废中氟元素分析方法研究

doi:10.19964/j.issn.1006-4990.2025-0039

Abstract

Abstract:

At present，the mainstream method for determining the mass concentration of fluoride ions in solutions is the fluoride ion selective electrode method，which is widely recognized for its advantages of simple operation，rapidity and high accuracy.However，when it is directly applied to the fluorine-containing solution with complex components produced during the treatment of hazardous waste in the aluminum industry，the accuracy will be greatly reduced.In order to improve the measurement accuracy，the prepared standard fluorine-containing solution was used as the research object to study the influence of the total ionic strength adjustment buffer（TISAB） on the analysis results. It was found that the appropriate dosage of TISAB was influenced by the concentrations of fluoride and aluminum ions in the solution.For solutions free of ions that could complex with fluoride，the volume ratio of the sample solution to TISAB could be set at 1∶0.5 for the preliminary test.Based on the preliminary test results，the ratio for the formal measurement could be adjusted by referring to the rule of the optimal volume ratio of different fluoride ion concentrations to TISAB.For solutions containing ions such as aluminum that could form complexes with fluoride，it was necessary to analyze the aluminum ion concentration and determine the dosage of TISAB to be added prior to the measurement.For solutions with an aluminum ion mass concentration higher than 120.0 mg/L，the aluminum ion mass concentration could be diluted to 120.0 mg/L，and the measurement could be performed with the volume ratio of the sample solution to TISAB of 1∶1.If the aluminum ion concentration was high while the fluoride ion concentration was too low，making excessive dilution inappropriate，the aluminum ion mass concentration could be diluted to 240.0 mg/L and the volume ratio of the sample solution to TISAB could be set to 1∶2，with a positive deviation of 4.50% added to the measured results.This method could control the error within 2.00% in the measurement of complex fluorine-containing solutions，and it provided a reference for the accurate determination of other fluorine-containing solutions with complex components.

Key words: fluoride-containing hazardous waste in aluminum industry, fluorine element analysis, total ionic strength adjustment buffer

CLC Number:

X705

LIU Yingzhun, YANG Sheng, FAN Yangyang, LIANG Xuemin. Study on analytical method of fluorine element in hazardous waste of aluminum industry[J]. Inorganic Chemicals Industry, 2026, 58(2): 100-107.

Figures/Tables 8

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Table 1

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Study on analytical method of fluorine element in hazardous waste of aluminum industry

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