Method for testing nitroso-sulfuric acid

A technology of nitrosyl sulfuric acid and detection method, which is applied in the direction of analyzing materials through chemical reactions and analyzing materials through observing the influence of chemical indicators, which can solve inaccurate testing, low measurement results, and environmental pollution, etc. problem, achieve the effect of improving accuracy and avoiding side effects

Inactive Publication Date: 2011-10-12
HANGZHOU LONGSHAN CHEM CO LTD
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Problems solved by technology

[0007] It will produce toxic and irritating nitrogen oxide gas, pollute the environment and endanger the health of operators
At the same time, due to the introduction of systematic errors due to side reactions, the measurement results are low and the test is inaccurate

Method used

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  • Method for testing nitroso-sulfuric acid

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Embodiment 1

[0024] The detection steps described in this embodiment are:

[0025] Step 1. Accurately weigh an appropriate amount of common commercially available concentrated sulfuric acid and the sample to be tested in a clean and dry 125ml drop bottle, mix well, dilute the content of nitrosylsulfuric acid in the sample to below 20% with concentrated sulfuric acid, and prepare The intermediate sample is reserved. In the intermediate sample, if the content of nitrosyl sulfuric acid is greater than 20%, the relative error caused by the side reaction is greater than 1%.

[0026] Step 2. In a 250 ml Erlenmeyer flask, add about 40 ml of potassium permanganate standard titration solution (0.1mol / L) with a burette. Add 10ml (1+5) of sulfuric acid solution, accurately weigh about 1g of the sample prepared in step 1 dropwise (do not weigh too much, the red color should not disappear), and heat to about 40°C. Add sodium oxalate solution (0.2mol / L) with a burette until the solution becomes clear, ...

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Abstract

The invention relates to a method for testing nitroso-sulfuric acid, and belongs to the field of chemical engineering experiments. The invention adopts a method of diluting first and then testing so as to greatly avoid the side reaction of the nitroso-sulfuric acid and water in solution of oxidant when high-content nitroso-sulfuric acid is measured and greatly enhance the accuracy of testing because of no side reaction. Non-toxic and non-irritating nitrogen oxide gas does not pollute the environment and do harm to the health of an operator.

Description

technical field [0001] The invention relates to a method for detecting nitrosyl sulfuric acid and belongs to the field of chemical experiments. Background technique [0002] At present, potassium permanganate redox titration can be used for the detection of nitrosylsulfuric acid. Specifically, in an acidic medium, oxidize nitrosylsulfuric acid with excess potassium permanganate, and then reduce excess potassium permanganate with sodium oxalate. The reaction formula is as follows: [0003] 2KmO 4 +5NOSO 4 H+2H 2 O=K 2 SO 4 +2MnSO 4 +5HNO 3 +2H 2 SO 4 [0004] There are following disadvantages when this direct oxidation method measures high-content nitrosyl sulfuric acid: [0005] Nitrosyl sulfuric acid produces a side reaction with water in the oxidant solution, and the side reaction equation is as follows: [0006] NOSO 4 H + H 2 O=NO+NO 2 +2H 2 SO 4 [0007] It will produce toxic and irritating nitrogen oxide gas, which will pollute the environment and en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/79
Inventor 金沛灿邓乐平
Owner HANGZHOU LONGSHAN CHEM CO LTD
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