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Method for determining content of nitrogen in nitrate and/or nitrite of water sample and device thereof

A technology of nitrogen content and nitrate, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of high toxicity and easy pollution to the environment, and achieve the effects of no harm to health, accurate and fast testing, and high precision

Inactive Publication Date: 2012-08-29
BEIJING JITIAN INSTR CO LTD
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Problems solved by technology

[0006] The purpose of the invention of this application is to overcome the problems of high toxicity and easy pollution to the environment produced by the existing method of detecting the nitrogen content of nitrate and nitrite in water by the cadmium column reduction method, and to provide a non-toxic Method and device for determining nitrogen content in nitrate and / or nitrite of water samples

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  • Method for determining content of nitrogen in nitrate and/or nitrite of water sample and device thereof
  • Method for determining content of nitrogen in nitrate and/or nitrite of water sample and device thereof
  • Method for determining content of nitrogen in nitrate and/or nitrite of water sample and device thereof

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Embodiment Construction

[0032] The operating steps of the present embodiment nitrite (NO2-) nitrogen content test are as follows:

[0033] 1. Preparation of standard samples:

[0034] 11 Weigh 4.926g of potassium nitrite (KNO2) dried at 60°C for one hour in 800ml of deionized water, dissolve and dilute to the mark with artificial seawater, and shake well. Prepare a nitrite nitrogen (NO2-) stock solution of 1000 mg N / L (calculated as nitrogen) for future use.

[0035] 1.2 Dilute the 1000mg / L nitrite nitrogen (NO2-) stock solution step by step with deionized water to prepare 0.0, 20.0, 50.0, 100.0, 200.0, 500.0, 800.0, 1000.0μg N / L standard series.

[0036] 1.3 Ammonium chloride buffer solution with pH 8.6.

[0037] 1.4 Sulfonamide developer: 70ml of 85% phosphoric acid, 24g of sulfonamide (C6H8N2O2S), 1.2g of N-(1-naphthyl)ethylenediamine hydrochloride (C12H16Cl2N2), dissolved in deionized water and mixed to 1L.

[0038] 1.5 The carrier is deionized water.

[0039] The reagents used are domestic r...

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Abstract

The invention relates to a method for determining the content of nitrogen in nitrate and / or nitrite of a water sample and a device thereof. According to the method, the water sample, deionized water and a buffer solution of which the pH value is 5.2-8.6 are mixed to prepare a mixed liquor, then the mixed liquor is heated at the temperature of 50-80 DEG C and then is irradiated under ultraviolet light, or the obtained mixed liquor is directly mixed with a sulfanilamide color-developing agent, and the content of the nitrogen in the nitrate and / or the nitrite of the water sample is detected by an ultraviolet and visible spectrophotometer. The device disclosed by the invention comprises a sample introduction device, a sampling ring, a multi-ported valve, a peristaltic pump, a heating module, an ultraviolet digestion module, a knitting reactor, a flow cell, the ultraviolet and visible spectrophotometer, a deionized water container, a buffer solution container, a color-developing agent container, a first three-way valve, a second three-way valve, a first back pressure regulator, a second back pressure regulator, a waste liquor groove and a computer. The method is nontoxic, and has no pollution on the environment; and the device is high in test sensitivity and good in accuracy.

Description

technical field [0001] The present invention relates to a kind of method and its device for measuring the nitrogen content in nitrate and / or nitrite of water sample, particularly relate to a kind of method of measuring nitrate and / or nitrite in water by ultraviolet reduction-flow injection spectrophotometry analysis method A method of neutralizing nitrogen content and an apparatus using the method. Background technique [0002] At present, the nitrogen content in nitrate and nitrite in water is mainly measured by the cadmium column reduction method, which reduces the nitrate in water to nitrite, together with the original nitrite and sulfanilamide diazonium in the water sample red. and then coupled with N-(1-naphthyl)ethylenediamine hydrochloride to form a rose red azo dye, which was measured at 540nm, and the nitrous acid measured by the same method was subtracted from the water sample without the reduction column Salt, measure the content of nitrate. This method has high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/27
Inventor 赵萍张卫宏魏月仙顾爱平
Owner BEIJING JITIAN INSTR CO LTD
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