Ammonium-nitrogen online monitor based on distilling-titration method

Abstract

The invention relates to an ammonium-nitrogen online monitor based on a distilling-titration method. The ammonium-nitrogen online monitor consists of a sampling and pretreatment unit, a quantifying unit, a distilling unit, an absorption and titration unit, an aftertreatment unit and a PLC controller. A liquid buffer solution is adopted to substitute solid MgO to realize the automatic addition of a pH regulator; an automatic distilling apparatus with adjustable electric heating power and controllable distilling rate is adopted, so that the distilling efficiency is increased, and the safety and reliability of the instrument are improved; an automatic liquid metering apparatus capable of freely adjusting the liquid amount is adopted, so that the precise quantification of a water sample and absorption liquid can be realized; and a pH potential detection electrode is adopted to automatically determine a titration end point, so that the sensitivity and accuracy of the instrument are improved, the measurement range of the instrument is enlarged, and the ammonium-nitrogen online monitor can be simultaneously suitable for the online automatic detection of surface water such as industrial sewage, domestic sewage, rivers and lakes.

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...

AI Technical Summary

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 automatic detection of distillation-neutralization titration, so as to improve various technical performance indicators of the ammonia nitrogen online monitor and improve the system The accuracy, stability, reliability and adaptability of the measurement; and the titration detection electrode of the present invention adopts the pH potential detection electrode, which increases the sensitivity and accuracy of the instrument, expands the measurement range of the instrument, and makes it not only suitable for industrial sewage , the detection of domestic sewage, but also suitable for the detection of surface water such as rivers and lakes

Images