Method for rapidly determining content of urea in vehicle urea solution by using mid-infrared spectrum technology
A technology of infrared spectroscopy and urea content, which is applied in the field of urea content, can solve the problems of inability to carry out mobile detection of combustion method equipment, unfavorable mobile quality monitoring of urea aqueous solution, and shoddy quality of urea aqueous solution, so as to improve safety and Reliability, loss avoidance, and the effect of reducing the use of reagents
Inactive Publication Date: 2020-07-10
青岛市产品质量监督检验研究院
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Problems solved by technology
If the urea solution of unqualified quality is used, the nitrogen oxides produced by the diesel engine will not be completely absorbed, causing air pollution
The combustion method used in the existing national standard (GB 29518-2013 diesel engine nitrogen oxide reducing agent urea aqueous solution) has accurate and reliable measurement results, but requires a high level of sample preparation operations, requires a long measurement time, and requires the instrument The ash in the combustion tube is removed in time, and the equipment maintenance requirements are high. The combustion method equipment cannot be used for mobile detection, which is not conducive to the mobile quality monitoring of urea aqueous solution.
At present, there is still the phenomenon that the quality of urea aqueous solution is shoddy
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[0017] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0018] Use Thermo Fisher iS10 type Fourier transform infrared spectrometer in the specific embodiment of the present invention, deuterated triglyceride sulfate detector (DTGS), intelligent attenuation total reflection (ARK) detection accessory, ZnSe attenuation total reflection crystal; Adopt TQAnalyst The map data analysis software was used to establish the model; 10 kinds of commercially available diesel engine nitrogen oxide reducing agent urea aqueous solution were used as test samples, which were measured according to the combustion method stipulated in GB 29518-2013, and used for the following model establishment and calibration.
[0019] A method for quickly measuring the content of urea in urea solution for vehicles using mid-infrared spectroscopy technology. The commercially available diesel engine ni...
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The invention discloses a method for rapidly determining the content of urea in a vehicle urea solution by using an intermediate infrared spectrum technology. The method comprises the following steps:taking a diesel engine nitrogen oxide reducing agent urea aqueous solution sample, and respectively carrying out infrared spectrum test under the same conditions as a standard sample; obtaining an infrared spectrogram of the detection sample; measuring the peak area of the characteristic absorption peak; obtaining the urea content of the sample by the quantitative model; the correlation coefficient R of the predicted value and the measured value of the model is 0.9757; the root mean square of the prediction error of the verification set is 0.141; the method is mainly used for measuring the content of urea in the automotive urea solution, sample pretreatment is not needed, errors caused by reagent use and multi-step operation are reduced, and the method is rapid, accurate, suitable for thetechnical field of chemical detection, capable of being used for on-site rapid detection and screening in the circulation field, capable of improving the quality monitoring capacity and capable of avoiding losses caused by use of unqualified products.
Description
technical field [0001] The invention belongs to the technical field of chemical detection, and in particular relates to a method for rapidly measuring urea content in vehicle urea solution by using mid-infrared spectrum technology. Background technique [0002] The urea content is an important basis for evaluating the quality of urea aqueous solution as a nitrogen oxide reducing agent for diesel engines. If the urea solution of unqualified quality is used, the nitrogen oxides produced by the diesel engine will not be completely absorbed, causing air pollution. The combustion method used in the existing national standard (GB 29518-2013 diesel engine nitrogen oxide reducing agent urea aqueous solution) has accurate and reliable measurement results, but requires a high level of sample preparation operations, requires a long measurement time, and requires the instrument The ash in the combustion tube is removed in time, and the equipment maintenance requirements are high. The c...
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IPC IPC(8): G01N21/3577
CPCG01N21/3577G01N2021/3595
Inventor 程莎李环亭丁明善王晖孙胜男陈靖王志存黄连喜
Owner 青岛市产品质量监督检验研究院