Method for measuring chemical oxygen demand of waste water

A chemical oxygen demand and waste water technology, applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem of time-consuming and save time and test water. , the effect of less time

Inactive Publication Date: 2010-06-23
周建飞
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Problems solved by technology

This method has high accuracy and precision, but takes a long time

Method used

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Embodiment 1

[0018] 1. Reagent preparation: Dissolve 12.25g of superior pure potassium dichromate in water, transfer it into a 1000mL volumetric flask, and obtain a 0.2500mol / L potassium dichromate solution; weigh 1.458g o-phenanthroline and 0.695g Dissolve ferrous sulfate in water, dilute it to 100mL, and prepare the test ferrous spirit indicator solution and store it in a brown bottle; weigh 39.5g of ammonium ferrous sulfate and dissolve it in water, add 20mL of concentrated sulfuric acid, and transfer it into a 1000mL volumetric flask after cooling. Add water to dilute to the marked line, shake well to obtain ferrous ammonium sulfate standard solution; add 25g silver sulfate to 2500mL concentrated sulfuric acid to obtain sulfuric acid-silver sulfate solution.

[0019] 2. Titration test: first add 0.4g of mercury sulfate to a 250ml Erlenmeyer flask, then add 20mL of water sample, accurately add 10.00mL of potassium dichromate standard solution and several cleaned glass balls, measure 30mL...

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Abstract

The invention discloses a method for measuring the chemical oxygen demand of waste water, which comprises the following steps: preparing standard solution of potassium dichromate, ferroin indicator solution, standard solution of ammonium ferrous sulfate, solution of sulfuric acid-silver sulfate and mercuric sulfate; diluting the mercuric sulfate in a water sample, adding the standard solution of potassium dichromate and a plurality of cleaned glass balls in a certain proportion; adding the solution of sulfuric acid-silver sulfate; heating the solution into an autoclave; after keeping the solution at a certain temperature and under a certain pressure for a period of time, adding water to continuously cool to room temperature; adding the ferroin indicator solution, performing titration through the standard solution of ammonium ferrous sulfate; recording the dosage of the standard solution of ammonium ferrous sulfate according to color changes; performing a blank experiment through distilled water according to the same operating steps; and recording the dosage of the standard solution of ammonium ferrous sulfate in blank titration. The method has the advantages of time conservation, and simple requirements on test conditions.

Description

technical field [0001] The invention relates to a method for measuring waste water index, in particular to a method for measuring waste water chemical oxygen demand. Background technique [0002] At present, the chemical oxygen demand (COD) of wastewater is usually determined by the potassium dichromate method. This method has high accuracy and precision, but takes a long time. In actual production, especially during engineering commissioning, sometimes it is necessary to know the data of each treatment process index in time, so as to timely understand and control the chemical oxygen demand index of wastewater in the process of production and engineering commissioning. Therefore, it is very necessary to research and develop a method for rapid determination of chemical oxygen demand in wastewater. Contents of the invention [0003] The purpose of the invention is to provide a method for quickly measuring the chemical oxygen demand of wastewater. [0004] To achieve the a...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 周建飞
Owner 周建飞
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