Apparatus and method for measuring chlorine ion and total organic carbon in water

Abstract

The invention provides an apparatus for measuring chlorine ion and total organic carbon in sea water, high-chlorine and -salt wastewater, surface water, underground water, drinking water, domestic sewage and industrial wastewater, wherein the apparatus mainly includes a sample quantitative sampling device, a potentiometric titrator, a horizontal rotor, a sample dish, a sample cup (sample tube), an automatic sample injector, a multi-position valve, an oxidization reactor, a gas-liquid separator, a membrane filter and a detector, and a data processing and display apparatus. The apparatus can be used for measuring the chlorine ion and the total organic carbon in water for measurement in laboratories, on-line measurement and emergent portable in-site measurement.

Description

technical field [0001] The invention relates to a water quality measuring instrument, in particular to a device for measuring chlorine ions and total organic carbon in water. Background technique [0002] Total Organic Carbon (TOC, TotalOrganicCarbon), as an indicator of organic pollutants in water, has become the main means of water treatment and quality control in many countries in the world, and is widely used in quality control of rivers, lakes and ocean monitoring. TOC measurement is required in drinking water supply, pharmaceuticals, food, semiconductor industry, waste humification degree analysis, carbon flux analysis of aquatic systems, soil carbon content determination, and soil carbon cycle. [0003] Existing TOC automatic analyzers, when used to measure seawater and high-salt wastewater, due to Cl - interference, while monitoring the CO 2 For this reason, the main methods are to reduce the injection volume, pre-dilution, absorb with mercury salt solution, wash w...

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Problems solved by technology

However, because the needle core of this method is too fine, even if the water sample is finely filtered, and the sample is washed repeatedly after injection, the problem of needle core blockage often occurs; pre-dilution of the water sample is a commonly used method at present. By diluting Cl - The concentration of the carbon dioxide is reduced to a level that is not enough to interfere with the detection results of carbon dioxide, but for seawater and high-salt wastewater, often Cl - The concentration of TOC is much higher than the concentration of TOC. If the dilution factor is too large, the concentration of TOC is likely to be lower than the detection limit of the instrument; absorption with mercury salt solution, although it can completely eliminate Cl - interference, but the discharged waste liquid contains highly toxic Hg, which will cause secondary pollution; the KI solution reported abroad and the hydroxylamine hydrochloride solution washing reaction gas method proposed in the "Marine Monitoring Specification" GB17378-2007 are too complicated due to the process , can only be used for intermittent determination and cannot be used for continuous online determination; the TOC analyzer of foreign companies adopts the method of connecting metal foil in front of the detector to absorb Cl - ions, but due to the absorption of Cl - The ability of ions is very limited and needs to be replaced continuously, and it is still not enough to completely eliminate seawater and high-salt wastewater Cl - interference

[0004] The invention patent publication number is CN102564823A (application number 201110433551.3). Before the detection of carbon dioxide, an ionic hydrazine containing silver is installed to absorb chlorine to form a solid, reducing or eliminating the interference of chlorine, but the concentration of chloride ions cannot be measured

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