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Device and method for continuously determining total organic carbon (TOC) concentration of sea water and high-salinity waste water

A high-salt wastewater and high-concentration technology, applied in the preparation of test samples, etc., can solve the problems of insufficient complete elimination, limited capacity, needle core blockage, etc., and achieve strong recyclability, large absorption capacity, and long action time Effect

Inactive Publication Date: 2012-07-11
YANTAI UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

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 is reduced enough for the CO 2 The degree of interference of the test results, but for seawater and high-salinity wastewater, often Cl - The concentration 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; although absorption with mercury salt solution can completely eliminate Cl - s interference, but the exhausted 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 GB17378-2007, because the process is too complicated, can only be used Can not be applied to online continuous measurement for batch measurement
The TOC instruments of companies such as MAIHACK in Germany and I-O in the United States adopt the method of connecting metal foil in front of the detector to absorb Cl - , but due to the absorption of Cl - The capacity is very limited and needs to be replaced constantly, and it is still not enough to completely eliminate Cl in seawater and high-salt sewage. - Impact

Method used

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  • Device and method for continuously determining total organic carbon (TOC) concentration of sea water and high-salinity waste water
  • Device and method for continuously determining total organic carbon (TOC) concentration of sea water and high-salinity waste water
  • Device and method for continuously determining total organic carbon (TOC) concentration of sea water and high-salinity waste water

Examples

Experimental program
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Embodiment 1

[0020] Example 1 A device for continuously measuring the TOC concentration of seawater / high-salt wastewater mainly includes a sampling device, an acidification reactor 4, a simple gas-water separator 7, an oxidation reactor 9, a dehydrator 10, an ion trap 12 and organic CO connected in sequence. 2 The detector 13, the simple gas-water separator 7 is provided with an exhaust port 8, and the dehydrator 10 is provided with a drain port 11. The sampling device mainly includes a sampling port 1, a reagent bottle 5, and a carrier gas cylinder 6. The sampling port 1 is connected to the acidification reactor 4 through a filter 2, a flow meter 0, and a peristaltic pump 3; The pump 3 is connected to the acidification reactor 4, and the carrier gas cylinder 6 is divided into two paths by a three-way solenoid valve, one of which is connected to the acidification reactor 4. The reagent bottle 5 contains a solution prepared by proportioning acidulant and oxidant. The acidification reactor 4 ...

experiment example 1

[0031] Experimental example 1 Distilled water, sea water and salt water with different sodium chloride content were prepared into 25mg / L, 50mg / L, 75mg / L, 100mg / L, 150mg / L, 200mg / L potassium hydrogen phthalate standards. Solution, and then use the device and method of Example 1 to perform TOC measurement. The results are shown in Tables 1, 2, and 3 respectively.

[0032] Table 1 TOC measured values ​​of distilled aqueous solutions of potassium hydrogen phthalate with different concentrations

[0033]

[0034] It can be seen from Table 1 that the relative error (RSD) of the TOC measured value of the standard solution of potassium hydrogen phthalate in distilled water by this method is less than or equal to 0.5%, indicating that the measured value has high stability and good reproducibility.

[0035] Table 2 TOC measured value of different concentrations of potassium hydrogen phthalate sea water solution

[0036]

[0037]

[0038] The above results show that the relative error RSD of thi...

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Abstract

The invention provides a device and a method for continuously determining total organic carbon (TOC) concentration of sea water and high-salinity waste water. An ion trap which is large in absorption volume, long in effect time, convenient in part replacement and strong in recycling for chlorine (C1) is added into the device before detection of carbon dioxide (CO2), so that authenticity of a test result is ensured.

Description

Technical field [0001] The invention relates to an online automatic analysis technology for continuously measuring the TOC concentration of seawater and high-salt wastewater. Background technique [0002] The existing TOC automatic analyzer, when used to determine seawater and high-salt wastewater, due to Cl - Interference, in the detection of CO 2 Larger errors will occur in the content. To this end, the main methods include reducing the injection volume, pre-dilution, absorption with mercury salt solution, washing with KI solution or hydroxylamine hydrochloride solution, and connecting metal foil in front of the detector. For example, the TOC-5000 and TOC-4100 TOC analyzers of Japan's SHIMADZU Company use a method of reducing the sample amount so that the chloride ions produced by the smaller seawater samples are not enough to affect the measured value of TOC. However, because the injection needle core of this method is too fine, even if the water sample is finely filtered and...

Claims

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Application Information

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IPC IPC(8): G01N1/28
Inventor 徐惠忠徐滋秋周明徐成彬潘丽杰
Owner YANTAI UNIV
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