Method for determining content of hydrofluoric acid in nitric acid-hydrofluoric acid pickling solution
The technology of a hydrofluoric acid type acid and a determination method is applied in the field of analysis and testing of electroplating solutions, which can solve problems such as many operation steps, and achieve the effects of low cost, accurate and consistent detection results, and convenient detection process.
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[0030] (2) Preparation of fluorine standard stock solution: Weigh 2.0985g of standard pure sodium fluoride (accurate to 0.0001g) after drying at 105℃ for 2h and cooling in a desiccator, dissolve it in water, dilute to 1000mL, shake well, Stored in a polyethylene bottle, the concentration of fluorine in this solution converted to hydrofluoric acid is 1mg / mL;
[0031] (3) Preparation of fluorine standard solution A: Pipette 1.00mL fluorine standard stock solution into a 100mL volumetric flask, add water to the mark, shake well, and store in a polyethylene bottle. The fluorine content in this solution is converted into hydrofluoric acid The concentration is 0.01mg / mL;
[0032] (4) Preparation of fluorine standard solution B: Pipette 5.00mL fluorine standard stock solution into a 100mL volumetric flask, add water to the mark, shake well, and store in a polyethylene bottle. The fluorine content in this solution is converted to hydrofluoric acid The concentration is 0.05mg / mL;
[0033] (...
Example Embodiment
[0045] Example 2
[0046] The same method as in Example 1 was used, except that sample 1 was replaced with sample 2.
[0047] After measurement and calculation, the content of hydrofluoric acid in sample 2 is 2.72 g / L.
Example Embodiment
[0048] Example 3
[0049] The same method as in Example 1 was used, except that sample 1 was replaced with sample 3.
[0050] After measurement and calculation, the content of hydrofluoric acid in sample 3 is 3.05 g / L.
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