Nitroaniline fading method for determining nitrogen concentration of nitrite solution
A technology of nitrite nitrogen and nitroaniline, which is applied in the measurement of color/spectral characteristics, material analysis by observing the influence on chemical indicators, and analysis by making materials undergo chemical reactions, can solve problems that are not suitable for general experiments. In order to achieve stable and reliable results, tolerant test conditions and easy operation
Inactive Publication Date: 2008-09-10
SHENYANG JIANZHU UNIVERSITY
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Problems solved by technology
Although this method can eliminate the interference of cations through the cation exchange column during the separation process, it cannot completely eliminate the interference of anions, and the measurement cycle is long, and it takes 30 minutes to measure a sample.
Other determination methods are seldom used, the main reason is that they need the support of high-end equipment and high-end technology, and are not suitable for general laboratory applications and operations
Method used
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Embodiment 1
[0025] Use this method to measure 3 domestic sewage samples with a concentration not higher than 10mg / L, and compare the data with the national standard method (GB13580.7-92, GB7493-87) as follows:
[0026]
Embodiment 2
[0028] Use this method to measure 3 sewage water samples with concentrations ranging from 100 to 1000 mg / L, and compare them with the data measured by the national standard method (GB13580.7-92, GB7493-87) after dilution of 100 times as follows:
[0029]
[0030] As can be seen from the above two examples, when the concentration in the solution is low, the determination accuracy of the national standard method is higher than that of the nitroaniline fading method, and when the concentration in the solution is high, due to the need to dilute the application of the national standard method, this may introduce Operating error, its accuracy is not as good as the nitroaniline fading method.
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The invention discloses a method of nitroaniline discoloration for measuring nitrogen concentration of nitrite in solution, relating to a method for measuring nitrogen concentration of nitrite in solution. The method works in the following steps: first, 1 to 10 ml tested sample solution is taken and put in a measuring flask of 25 to 100 ml, then 1 to 10 ml nitroaniline solution with concentration of 0.001 to 0.010 mol/L is added and mixed, and then 1 to 10 ml acid solution with concentration of 0.1 to 10.0 mol/L is added and the volume is fixed to the scale through water, then the solution is blended and placed for 1 to 30 min; water is taken as blank, a 10 to 50 mm colorimetric ware is used, a spectrophotometer is adopted to measure the blank absorption value of the reagent and the sample at the scale of 400 to 500 nm, and compared with the standard curve, the nitrogen concentration of nitrite in the sample can be calculated. The method has the advantages of simple operation, larger range of concentration measurement, batch measurement of nitrogen content in nitrite in short time, steady and reliable result as well as good repeatability.
Description
technical field [0001] The invention relates to a method for measuring the concentration of nitrite nitrogen in a solution, in particular to a method for measuring the concentration of nitrite nitrogen in a solution by a nitroaniline fading method. Background technique [0002] As one of the frontiers of the current chemistry discipline, the research and application of green chemistry has received extensive attention. The goal of green chemistry is to prevent pollution from the source, and the realization of this goal is inseparable from green analytical chemistry. Nitrite is a typical pollutant, an intermediate product of the nitrogen cycle in nature, and widely exists in the environment and food. When the human body ingests a certain amount of nitrite, methemoglobinemia will occur, and the ability of hemoglobin to transport oxygen in the human body will be lost. In addition, nitrite can also react with secondary amines to generate carcinogenic nitrosamines. [0003] In ...
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IPC IPC(8): G01N21/78G01N21/25
Inventor 牛明芬李卓平徐丽刘知远吴蕊
Owner SHENYANG JIANZHU UNIVERSITY
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