Method for testing nitroaniline content

Abstract

The invention discloses a paranitroaniline content detection method, having technique content of 1) dissolving an analytically pure contrast of the paranitroaniline detection by methanol under an ultrasonic condition, diluting by a dilute sulfuric acid solution to obtain a concentrated liquid, 2) diluting the concentrated liquid of the contrast as required to prepare a series solution with a determined concentration, charging a sodium nitrite solution, an ammonium sulfamate solution and a 2-hydrochloric acid naphthyl ethylenediamine solution sequentially for a coloring process so as to obtain a work liquid series capable of optical density (OD) measurement, measuring the optical density (OD), 3) processing the concentration and the optical density (OD) of the work liquid series of the contrast to obtain a standard curve and a corresponding regression equation, 4) processing and measuring the sample to be measured by the same method, and calculating the paranitroaniline concentration of weight percentage in the sample by the regression equation.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a rapid detection method for p-nitroaniline content of chemical raw material products. Background technique [0002] p-Nitroaniline is an important organic synthesis intermediate, widely used in dyestuff, pesticide, medicine, veterinary medicine and rubber industry. Due to the relatively rapid development of my country's chemical industry in recent years, in order to ensure that the quality of intermediates or finished products obtained in the production of chemical products meets the requirements of national standards, it is necessary to control the quality. Comprehensive factors must be considered in operation. Generally speaking, the higher the content of chemical products, the more economical it is to produce. Therefore, finding an accurate, fast and simple method for content determination is very useful for the control of intermediates or the quality inspection of fin...

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Problems solved by technology

[0009] Third, by examining the solubility of p-nitroaniline in water, it is known that the solubility of p-nitroaniline in 100g of pure water is: 0.08g / 18.5°C, or 2.2g / 100°C, which has Certain solubility, but the solubility of the solution decreases significantly when the solution returns to room temperature; its solubility in acidic aqueous solution has the same performance, at 25°C, the solubility in 0.025mol / L sulfuric acid aqueous solution is less than 0.2g / 100ml

[0010] Therefore, the too narrow solubility range affects the dissolution process of industrial production samples, and there are certain control difficulties and uncertain factors in the dissolution treatment, which may easily cause incomplete dissolution or precipitation after dissolution, thereby affecting the accuracy of the measurement results.

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