Method for testing nitroaniline content

A technology for the detection of p-nitroaniline, which is applied in the direction of material analysis by observing the influence of chemical indicators, measurement of color/spectral characteristics, analysis by making materials undergo chemical reactions, etc., which can solve the problem of too narrow solubility range, Incomplete dissolution, affecting the accuracy of measurement results and other issues

Inactive Publication Date: 2008-11-12
ZHEJIANG ESIGMA BIOTECH CO LTD
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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...

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  • Method for testing nitroaniline content
  • Method for testing nitroaniline content
  • Method for testing nitroaniline content

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[0019] The specific steps of sample preparation and detection operation involved in the present invention are as follows:

[0020] 1), the preparation of detection reference substance stock solution:

[0021] Accurately weigh about 0.05 grams (g) of analytically pure p-nitroaniline, place it in a 100 milliliter (ml) volumetric flask, add 50 milliliters (ml) of methanol, dissolve it ultrasonically, let stand and cool to room temperature, then add 0.025 mole The sulfuric acid solution per liter (mol / L) was adjusted to 100 milliliters (ml).

[0022] Take 1ml of this solution and place it in a 50ml volumetric flask, add 0.025 mol / L (mol / L) sulfuric acid solution to constant volume to 50 milliliters (ml) to obtain the detection reference substance stock solution, wherein every 1 milliliter (ml) contains p-Nitrate Aniline is about 10 micrograms (μg).

[0023] 2) Preparation of the working solution of the reference substance:

[0024] Take 15 25 milliliters (ml) graduated test tub...

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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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Application Information

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IPC IPC(8): G01N21/78G01N21/25
Inventor 胡玉霞莫金杰丁瑜
Owner ZHEJIANG ESIGMA BIOTECH CO LTD
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