Analysis method of acid solution

Abstract

The invention belongs to the technical field of analysis and testing and discloses an analysis method of an acid solution. The method comprises the steps of pre-testing a sample, classifying the sample as an aqueous solution and an organic solvent solution according to a solvent type, classifying the sample into an intermediate acid aqueous solution and an acid aqueous solution according to a pH value for the aqueous solution, classifying the sample into a 'roastable' aqueous solution and an 'in-roastable' aqueous solution according to the fact whether the aqueous solution can be roasted by an infrared lamp, analyzing volatile ingredients of the week acid aqueous solution sample and the roastable aqueous solution sample by a headspace GC-MS, analyzing solid ingredients after roasting, adding calcium carbonate into the other types of the aqueous solution samples and the organic solvent solution for neutralization, and then taking a precipitate for analysis or performing the analysis after the roasting. The method can quickly identify properties and approximate composition of the acid solution, has a high separation speed, small interference and a low detection limit for the acid solution and has a practical value.

Description

technical field [0001] The invention belongs to the technical field of analysis and testing, and in particular relates to an analysis method of an acidic solution. Background technique [0002] Since the reform and opening up, my country's economy has developed rapidly, and its GDP currently ranks second in the world. After the economy has entered the "new normal", although the growth rate has slowed down, the economy still maintains a medium-to-high speed development, and the growth rate continues to be at the forefront of the world's major economies. China's annual contribution to world economic growth has exceeded 30%, and it has become the locomotive of world economic development. In the process of economic development, a large number of industrial enterprises have been born in my country. By the end of 2015, the number of industrial enterprises above designated size in my country has exceeded 380,000. In the process of industrial production, it is inevitable to encoun...

AI Technical Summary

Problems solved by technology

When sodium hydroxide or potassium hydroxide is used for neutralization, since the acidic substances form water-soluble sodium salts or potassium salts, and cannot be separated by other organic solvents, the subsequent separation is seriously affected; the excessive amount of hydroxide that may be introduced Sodium and potassium hydroxide are also difficult to remove, or absorb carbon dioxide and turn into sodium carbonate and potassium carbonate, which continues to increase the interference of salt substances

In addition, the introduction of sodium ions and potassium ions will make the experimenter unable to determine whether the sample itself contains these two ions, and cannot draw correct conclusions; the reaction of trace organic acids and strong bases will cause serious difficulties in subsequent identification

When calcium hydroxide is used for neutralization, although many calcium salts form precipitates that are beneficial to the removal of acidic substances, calcium hydroxide is still slightly soluble in water; on the other hand, calcium hydroxide will also react with trace amounts of organic acids, which is also difficult to identify

Both neutralization methods therefore have serious flaws

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