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Method for measuring nickel content in urine

A determination method and technology of nickel content, applied in the preparation of test samples, color/spectral characteristic measurement, etc., can solve the problems of inaccurate determination and large error of nickel content determination, and achieve simple operation, less instruments and reagents, and monitoring Effect of Equipment Corrosion Conditions

Inactive Publication Date: 2012-07-11
GUIZHOU YIHUA CHEM +1
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problems of relatively large measurement error and inaccurate measurement of nickel content in urine in the prior art, and to provide a method for measuring nickel content in urine by refining method to accurately measure the content of nickel in urine. Nickel content, effective monitoring of corrosion in urea production units

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  • Method for measuring nickel content in urine

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[0021] Reagents: 1. Nickel standard solution: Accurately weigh 0.1000 g of metallic nickel (99.9%), heat and dissolve in 5 ml (1:1) nitric acid solution, set the volume to 1 liter, and then dilute this solution 100 times to get 1 μg / ml nickel standard solution;

[0022] 2. Ferro-titanium reagent: 10% aqueous solution of 1,2-dihydroxybenzene-3,5 sodium disulfonate;

[0023] 3. PAN: 0.1% 1-(2-pyridylazo)-2-naphthol ethanol solution;

[0024] 4. Buffer solution: Weigh 67.5 grams of ammonium chloride and dissolve in a small amount of water, add 570 mL of concentrated ammonia water, and dilute to 1000 mL;

[0025] 5. Hydrochloric acid solution: 3.0mol / L

[0026] 6. Cyclohexane: analytically pure

[0027] Draw the standard curve: draw 0, 1, 2, 3, 4, 5mL of nickel standard solution, put them into six 250mL pear-shaped separating funnels, add 2mL of hydrochloric acid each, dilute to 50mL with distilled water, and heat to a temperature of 35 -40°C, then add 5mL of buffer solution, ...

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Abstract

The invention discloses a method for measuring a nickel content in urine, comprising the following steps of: (1) drawing a standard curve: preparing a nickel standard solution; taking a blank reagent as a reference solution after the treatment; measuring absorbance under a wavelength of 575 nm; and drawing the curve by taking absorbance A as a vertical coordinate and taking the nickel content as a transverse coordinate; (2) preparing a sample solution receiving a urine sample; heating to remove ammonia and evaporate water until urea powder with the sample water content of less than 1.0% is obtained; dissolving the urea powder with water and carrying out subsequent operation, such as treatment of the standard solution; and then measuring the absorbance; and (3) calculating a content, wherein a nickel concentration is equal to KA / M. The sample provided by the invention is refined to obtain the urea powder, and the ammonia, carbon dioxide and the water can be removed entirely, so as to remove an error of a result, which is caused by the components. The method provided by the invention is simple in operation and needs fewer instruments and reagents. After an applicant uses the method for four years, the equipment corrosion condition in a urea production process can be effectively monitored.

Description

technical field [0001] The field relates to a method for determining nickel content in urea production liquid, in particular to a method for determining nickel content in urine by a refining method. Background technique [0002] Determination of nickel content in urea production liquid can monitor the corrosion of urea production equipment. In actual production, it is necessary to analyze the nickel content of urine in each process, and judge which process is more severely corroded by analyzing the data. The nickel content is an important control analysis item in production. At present, the existing analysis methods of nickel content mainly adopt the wet bulb method or the volumetric flask method to undertake the urine sample, and analyze the ammonia and urea content in the urine by the volumetric method, and then convert it into nickel content. There are several sources of error in the actual operation of this method: [0003] 1. Errors caused by sampling: the discharge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28G01N1/34
Inventor 蒋远华杨晓勤冯发光聂波杨红梅
Owner GUIZHOU YIHUA CHEM
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