Instrument and method for automatically analyzing ammonia nitrogen in laboratory
An instrument and ammonia nitrogen technology, applied in the field of automatic analysis of ammonia nitrogen by Nessler's reagent distillation colorimetry, can solve the problems of complicated manual operations, and achieve the effects of accelerated analysis speed, stable performance, and simple flow path
Active Publication Date: 2013-05-22
李正挺
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Problems solved by technology
[0005] The method and instrument of the present invention solve the complicated manual operation problem, accelerate the analysis speed, and have the characteristics of simple flow path, easy operation, stable performance, etc.
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[0009] Such as figure 1 As shown, the instrument system of the present invention consists of a data processing personal computer A, an ammonia nitrogen analysis host B, an automatic sampler C and a printer D. The personal computer mainly completes the functions of analysis method setting, data storage and report printing, the automatic sampler completes the functions of automatic sample selection and injection when multiple samples are analyzed, and the host computer completes sample distillation pretreatment and automatic testing.
[0010] The analysis process of the host is as follows image 3 shown. The overall flow path includes two working modes: sample analysis and standard curve making: during sample analysis, the sample 21 to be analyzed passes through the solenoid valve 22, peristaltic pump head 23, solenoid valve 25 to the mixing tank 31 for use, and the excess liquid is received Waste liquid pipe 24; when making a standard curve, the 8 mg / L standard solution 20 an...
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The invention discloses an instrument and method for automatically analyzing ammonia nitrogen in a laboratory by using a Nessler's reagent distillation colorimetric method which is developed according to an ammonia nitrogen detection project standard analysis method of HJ 535-2009 Measurement of Water Quality Ammonia- Nessler's reagent Spectrophotography of Ministry of Environmental Protection. The method comprises the following steps of: providing continuous samples for the device by using three four-head peristaltic pumps; carrying out flow path switching and quantification by using an electromagnetic valve; automatically distilling by using an electric heating method and blowing out and condensing by additional nitrogen; precisely fixing proportion, carrying out timely flow control andmixing sodium hydroxide, boric acid, the Nessler's reagent and the samples to render color; measuring absorbance by using a semiconductor luminescent element with the wavelength of 415nm after light passes through a colorimetric ware; obtaining a standard curve by using an internal standard method or an external standard method; solving for the content of the sample of ammonia nitrogen to be measured, wherein the analysis time of each sample is 10min.
Description
technical field [0001] The invention relates to an instrument and method for automatically analyzing ammoniacal nitrogen by Nessler's reagent distillation colorimetry. Background technique [0002] In the process of ammonia nitrogen analysis in the laboratory, it is often necessary to carry out distillation pretreatment on the collected samples due to the high content of impurities in the samples. The heating method for the distiller has the following types in terms of medium: liquid (oil bath, water bath), water vapor, and solid. These devices use glass as the main material, and the heating method is indirect heat transfer, with complex structures, high equipment costs, low work efficiency, and slow distillation speed. General distillation equipment is only suitable for manual operation. It is bulky, explosive and fragile, has a long distillation time, is difficult to automatically control the distillation volume, and has low repeatability. It is not easy to use in the aut...
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IPC IPC(8): G01N35/00G01N35/10G01N21/78
Inventor 李正挺王在峰霍亮生李正雷
Owner 李正挺