Continuous synchronous real-time on-line determination method and instrument for three indexes of TOC, TN and TP

Abstract

The invention relates to a continuous synchronous real-time on-line determination method and instrument for three indexes of TOC, TN and TP. Data obtained by a CO2 detector, data obtained by a nitrate nitrogen detector and data obtained by an orthophosphate detector are transmitted to a data processor together. A set of sampling, acidification, oxidation and data processing systems and three independent detectors are shared, so that continuous synchronous on-line real-time determination on three contamination indexes of total organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP) in water can be realized.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring. Specifically, it relates to an online automatic determination instrument and method capable of continuous-synchronous-real-time measurement of total organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP) in water. Background technique [0002] Organic pollution of water bodies, also known as eutrophication pollution, is mainly due to human activities discharging excess nutrients into water bodies beyond the self-cleaning ability of water bodies. In water quality monitoring, total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) are commonly used to measure the degree of organic pollution in water bodies. [0003] The best way to monitor and prevent organic pollution of water quality is to use online automatic analysis and determination instruments to continuously measure and supervise environmental pollution indicators such as TOC, TN, and TP of ...

AI Technical Summary

Problems solved by technology

However, up to now, there are still the following shortcomings and deficiencies in the water quality online automatic analyzer: (1) The function of the instrument is relatively single

But up to now, there is no analytical instrument that can simultaneously measure the above three organic pollution indicators

(2) Cannot measure synchronously

Even multi-index analyzers mostly use different oxidation or color development systems, so it is difficult to achieve synchronization when measuring different indicators. For example, the TN oxidation of QuickTNP uses a high-temperature combustion method at 1200 ° C, while the TP oxidation uses UV-persulfuric acid. Salt digestion method, its operation process is also separated; another example is Japan’s Shimadzu TNP-4110 total phosphorus and total nitrogen analyzer, which uses persulfate-ultraviolet oxidation digestion method in the measurement of TN and TP, but the two systems from the sample injection , Oxidation to detection, the entire process is also run independently; another example is the German WTW TresCon company 6B-2000 multi-index water quality rapid analyzer, although it can measure COD, ammonia nitrogen, total phosphorus, total nitrogen and other indicators, but the used The multi-module design is nothing more than combining multiple test systems into one instrument, and the determination of different indicators is still carried out separately

This type of instrument is not so much a multi-index analyzer, but in fact it is simply a combination of multiple single-index analyzers into one instrument, so it is difficult to achieve simultaneous measurement of multiple indicators; (3) Continuous real-time monitoring is not possible

Existing TOC, TN, and TP analysis instruments generally take 30 minutes to 60 minutes to measure a sample, from sample introduction to oxidation to detection, even those products called online analyzers, such as Phosphax Sigma of HACH in the United States, Tres.Ccon of WTW in Germany, TP800 of TORAY in Japan, etc., have a measurement period of at least 20 minutes. From this point of view, these instruments are still intermittent analysis instruments in essence, so it is difficult to continuously monitor the changes in water quality. real-time monitoring

[0004] In short, no matter at home or abroad, so far, there is no online automatic measuring instrument that can continuously and synchronously measure the three water quality indicators of TOC, TN, and TP.

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