Ammonium-nitrogen online monitor based on distilling-titration method
A titration and monitor technology, which is used in chemical analysis, instruments, measuring devices, etc. by titration, can solve the problem that it is difficult to automatically add solid magnesium oxide, the stability time of the mixed indicator is short, and the titration end point is difficult to accurately realize automatic determination. and other problems to achieve the effect of improving technical performance indicators, increasing sensitivity and accuracy, and improving accuracy
Pending Publication Date: 2017-12-26
ZHEJIANG UNIV OF TECH
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Problems solved by technology
[0005] In order to solve the problems and technical difficulties existing in the distillation-neutralization titration method, such as the short stability time of the mixed indicator, the difficulty of automatic addition of solid magnesium oxide, and the difficulty of accurately realizing the automatic determination of the titration end point, the invention provides an online ammonia nitrogen based distillation-titration method. Monitor
Solve the problems of accurate sampling, solid MgO substitution, high-efficiency distillation, titration end point judgment, online automatic detection and other problems in the ammonia nitrogen online
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[0049] An ammonia nitrogen online monitor based on the distillation-titration method, including a sampling and pretreatment unit, a quantitative unit, a distillation unit, an absorption titration unit, a post-processing unit, and a PLC controller; and the PLC controller has a control module and data processing module.
[0050] The sampling and pretreatment unit includes a water sample pretreatment tank V1, the tank body 2-1 of the water sample pretreatment tank V1 is in the shape of a hollow cylinder, and the tank top 2-6 of the water sample pretreatment tank V1 Sampling port 2-5, acid addition port 2-3 and alkali addition port 2-4 are arranged in sequence on the top of the outlet, all of which are connected to the inner cavity of the water sample pretreatment tank V1; and the inlet of the acid addition port 2-3 The acid tank V3 is communicated with the acid adding pump P3 and supporting pipelines, and the inlet of the alkali adding port 2-4 is communicated with the alkali tan...
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An ammonia nitrogen online monitor based on the distillation-titration method is composed of a sampling and pretreatment unit, a quantitative unit, a distillation unit, an absorption titration unit, a post-processing unit, and a PLC controller. The present invention uses liquid buffer solution instead of solid MgO to realize the automatic addition of pH regulator; the present invention adopts an automatic distillation device with adjustable electric heating power and controllable distillation rate, which improves the distillation efficiency and increases the safety and reliability of the instrument The present invention adopts a liquid automatic metering device with freely adjustable liquid volume to realize accurate quantification of water samples and absorption liquids; the present invention uses a pH potential detection electrode to automatically determine the titration end point, which increases the sensitivity and accuracy of the instrument, And the measurement range of the instrument is expanded, so that the present invention can simultaneously adapt to the on-line automatic detection of industrial sewage, domestic sewage, rivers, lakes and other surface waters.
Description
technical field [0001] The invention relates to an ammonia nitrogen online monitor, in particular to an ammonia nitrogen water quality online automatic monitor based on a distillation-neutralization titration method and controlled by a PLC. Background technique [0002] There are many methods for the determination of ammonia nitrogen in water. According to different detection principles, there are mainly photometric method, electrode method, distillation-titration method, gas phase molecular absorption spectrometry, ion chromatography, stripping-conductivity method, etc. [0003] At present, the more common online ammonia nitrogen monitors on the market are mainly based on three types of methods: photometry, electrode method and distillation-titration method. Nessler's reagent and salicylic acid spectrophotometry are classic methods for the determination of ammonia nitrogen in water. They have the advantages of sensitivity and stability, but they are easily interfered by wat...
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CPCG01N31/164
Inventor 孙小方童谦周梦翔潘海天蔡亦军周猛飞
Owner ZHEJIANG UNIV OF TECH
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