Analysis method for hydrofluoric acid content in pickling solution
An analytical method, hydrofluoric acid technology, applied in the direction of electrochemical variables of materials, etc., can solve the problems of environmental impact, delay in production schedule, and increase the difficulty of management, and achieve the effect of avoiding toxic and harmful substances
Inactive Publication Date: 2017-02-22
JIANGXI HONGDU AVIATION IND GRP
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[0002] In the surface treatment process, the detection of the chemical composition of the pickling tank requires the detection of hydrofluoric acid, but the traditional method of analyzing hydrofluoric acid needs to use monochloroacetic acid and thorium nitrate. The management requirements of highly toxic drugs require strict control, which increases the difficulty of management. At the same time, caution is required during use, otherwise it may cause symptoms such as dizziness, headache, nausea, and vomiting, or cause sudden loss of consciousness, reflex Breathing stops, etc., and thorium nitrate is a radioactive substance, which not only affects the environment, but also causes damage to the operator's body, and because the country has recently strengthened the control of such substances, it is very difficult to purchase and supply at present. and may cause delays in the production schedule due to such reasons
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[0021] Imitating the main components of the pickling tank, the dissolved alloy is TC4, the dissolved amount is about 2g / L, and the standing time is more than 24h. The fluoride ion detection of three systems was carried out, and the standard addition recovery rate was between 95.38% and 102.88%, which met the measurement requirements. The specific experimental method is as follows:
[0022] 1. Prepare total ionic strength adjustment buffer solution (TISAB): prepare with sodium nitrate and sodium acetate solution in a certain ratio, and adjust the pH value of the test solution with glacial acetic acid to meet the pH value between 6.00 and 7.00.
[0023] 2. Prepare sodium fluoride standard solution: Accurately weigh 4.19g of the working standard reagent sodium fluoride dried at 105°C to 110°C to constant weight in a small beaker, add 50ml of water to dissolve, dilute to 200ml with water, and shake well. Then dilute it step by step to obtain 0.5, 0.1, 0.02, 0.004, 0.0008 mol / L fl...
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The invention relates to an analysis method for a hydrofluoric acid content in a pickling solution and belongs to the technical field of hydrofluoric acid analysis methods. A fluorinion selective electrode and a reference electrode are put in a solution to constitute a battery, and a potential value of the solution to be measured has a linear relationship with a logarithm value of fluorinion activity. A method of quantitatively adding a sample is used to calculate a change in a fluorinion concentration via a measured E value, and the fluorinion concentration is converted to the concentration of hydrofluoric acid via calculation at last. An accuracy and recovery rate experiment by detecting the influence of a nitric acid content in a pickling tank and detection temperature on fluorinion detection shows the method can meet requirements of routine pickling tank solution maintenance in a workshop.
Description
technical field [0001] The invention relates to a method for analyzing hydrofluoric acid content in pickling liquid, and belongs to the technical field of methods for analyzing hydrofluoric acid. Background technique [0002] In the surface treatment process, the detection of the chemical composition of the pickling tank requires the detection of hydrofluoric acid, but the traditional method of analyzing hydrofluoric acid needs to use monochloroacetic acid and thorium nitrate. The management requirements of highly toxic drugs require strict control, which increases the difficulty of management. At the same time, caution is required during use, otherwise it may cause symptoms such as dizziness, headache, nausea, and vomiting, or cause sudden loss of consciousness, reflex Breathing stops, etc., and thorium nitrate is a radioactive substance, which not only affects the environment, but also causes damage to the operator's body, and because the country has recently strengthened ...
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IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 周琳燕
Owner JIANGXI HONGDU AVIATION IND GRP