Online COD water quality detection method

A detection method and technology for water quality, applied in the measurement of color/spectral characteristics, etc., can solve the problems of long time consumption and strong dependence on electricity, and achieve the effect of reducing test costs, reducing environmental damage, and improving analysis efficiency.

Inactive Publication Date: 2017-09-08
苏州源泓环保科技有限公司
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Problems solved by technology

It can accurately represent the content of organic matter in anhydrous water, and is not affected by water quality, but the current detection method takes a long time and is highly dependent on electricity

Method used

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Examples

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Embodiment

[0016] The present embodiment is the online detection method of COD water quality, and this method is the spectrophotometric method that utilizes potassium hydrogen phthalate as standard solution to measure COD in water, and its detection step is:

[0017] S1, prepare the standard solution of potassium hydrogen phthalate, accurately weigh 0.8504g of potassium hydrogen phthalate, dry potassium hydrogen phthalate at 105°C for 2.5h, dissolve in 300ml of distilled water, and slowly pour into 10ml of concentrated Stir sulfuric acid, cool to room temperature, take the above-mentioned 40ml standard solution with a concentration of 1000mg / L in a 250ml volumetric flask, dilute with distilled water to the scale of the volumetric flask, and shake well to obtain a standard solution corresponding to a COD concentration of 160mg / L. Distilled water passes through a strong acidic cation exchange resin hydrogen column, collects the effluent in a glass bottle, and adds 10 g of the same resin per...

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Abstract

The invention discloses an online COD water quality detection method which is a spectrophotometric method for determining COD in water by utilizing potassium hydrogen phthalate as a standard solution. The online COD water quality detection method comprises the following detection steps: configuring the standard solution of the potassium hydrogen phthalate, configuring a detection reagent, drawing a standard curve and treating waste liquid. The online COD water quality detection disclosed by the invention has the benefits that the analysis efficiency is improved, and the test cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of water quality detection, and in particular relates to an online COD water quality detection method. Background technique [0002] The determination of COD by potassium dichromate method is a domestically recognized standard method for the determination of COD. Water samples, potassium dichromate and silver sulfate are digested at high temperature in the digestion tank, and chromium ions are reduced from Cr4+ to Cr3+ as an oxidant to change the color. In the test, the COD value is proportional to the increase in the absorbance of Cr3+, and the analyzer converts the absorbance of Cr3+ into the COD value of the sample. It can accurately represent the content of organic matter in anhydrous water, and is not affected by water quality, but the current detection method is time-consuming and highly dependent on electricity. Contents of the invention [0003] The purpose of the present invention is to solve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 张景东袁洪丹
Owner 苏州源泓环保科技有限公司
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