Analytic method for measuring content of each component in sulfuric acid and nitric acid mixture
An analysis method and mixture technology, which are applied in chemical analysis by titration, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc. The problems of low sensitivity and high detection cost can achieve the effect of low experimental cost, obvious color change and wide detection range.
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Embodiment 1
[0024] In this program, a mixture of sulfuric acid and nitric acid of known concentration is used as a test sample. The operation steps are as follows:
[0025] 1. Preparation of standard solutions of sodium hydroxide, ferrous sulfate and potassium permanganate;
[0026] 2. Sample preparation: prepare 100g of sulfuric acid solution with 90% or so, titrate its exact concentration with NaOH standard solution, prepare about 30g of 50% nitric acid solution, titrate its exact concentration with NaOH standard solution, accurately weigh 50g of sulfuric acid solution and add slowly Weigh 15g of nitric acid solution to form a mixed acid sample, weigh 10g (accurate reading to 0.0002g) of the mixed acid sample, record it as mg, transfer it to a 250mL volumetric flask after dissolution, and make it into a stock solution to be tested;
[0027] 3. Determination of total acidity: accurately pipette 5mL of the above stock solution (V 1 ) in a clean Erlenmeyer flask, add 2 drops of phenolpht...
Embodiment 2
[0033] This program is to use the standard solution of nitric acid as the test sample, and other operations are the same as in Example 1.
[0034] Test results:
[0035] The arithmetic mean of the three parallel determination results is taken as the final measurement result, which is very close to the concentration of the standard solution, and the relative average standard deviation is 0.79%.
Embodiment 3
[0037] This program is to measure the reaction mixed acid solution of three batches of isooctyl nitrate made by the laboratory. Sample preparation: Weigh about 20 grams of mixed acid sample, dilute with water, and dilute to 25 omL. Other operations are the same as in Example 1.
[0038] Test results:
[0039] ① sulfuric acid content: 77.86%, nitric acid content: 3.91%; ② sulfuric acid content: 77.11%, nitric acid content: 2.48%; ③ sulfuric acid content: 78.35%, nitric acid content: 1.20%. For each batch of samples, the arithmetic mean of three parallel determination results was taken as the final determination result, and the relative average standard deviations were 0.91%, 0.77%, and 0.81%, respectively.
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