How to configure water with different COD concentrations such as 500 1000 1500 , urgent!! Solving!!

COD, Chemical Oxygen Demand.

Therefore, it is good to add oxygen-depleting agents to the water, such as methanol CH3OH, according to the chemical balance, 1 mole of methanol needs 3 moles of O

500mg L of COD solution is: 1L of aqueous solution contains 2 3*500mg of methanol.

It seems that the most used instrument is the rapid determination of hash, which can be read directly after digestion.

There is also an upstairs saying that the national standard method is determined. In many cases, mercury sulphate is used to eliminate interference.

1.In my case, domestic sewage COD100 250 has it, and the value is different every day, after all, the domestic water is different every day, and the value is naturally different.

Water in general? I haven't tested it with tap water, so I guess it's 8 at most.

2.If the water does not meet the regulations, it will be treated, and the activated sludge method is good.

COD is Chemical Oxygen Demand.

Organic matter in water. Chemical.

The more substances are decomposed, the oxygen consumption increases, and the COD naturally increases.

The COD standard solution is 100mg L, if you want other values, you can calculate it yourself, anyway, it's proportional.

It is usually titrated manually, not measured by machine.

There is a heater. Reagent tubes. Pipette. Burette.

The additional drug to be used is probably potassium dichromate.

Mixed with medicinal powder).Silver sulfate (commercially available can also be matched by yourself).Ammonium ferrous sulfate for titration, ask the instrument line to see, the price is different in each place.

The COD rapid tester, Lanzhou Lianhua, we used, first digested and then measured, but the data was not accurate. We digest with an instrument and then titrate with ferrous sulfate, thus omitting the steaming step.

Configured with potassium hydrogen phthalate standard solution, since the theoretical CODCR value per gram of potassium hydrogen phthalate is , so, dissolve potassium hydrogen phthalate in re-distilled water, transfer to a 1000ml volumetric flask, and dilute it to the mark line with re-distilled water to make it a 500mg L CODCR standard solution.

Dilute it to 100 mg l and you're done. Newly matched with time. Because the potassium hydrogen phthalate that needs to be weighed during direct configuration is too small, the error is too large, so it is best not to configure it directly.

Summary. Step 1: Before opening the reagent, please confirm that the reagent purchased is 50 samples (50 samples for each of the high and low ranges) or 100 samples (100 samples for the high range).

Step 2: Pour the whole bottle of C1 powder reagent into the beaker (here there are no 50 samples or 100 samples, all of them are poured into the prepared beaker). Step 3:

50 samples, please measure distilled water; Please take 75ml of distilled water for 100 samples (please choose distilled water or purified water for laboratory use, and do not use mineral water such as mineral water).

Measure the concentration of COD content is 500 how to add sewage and distilled water.

Step 1: Before opening the reagent, please confirm that the reagent purchased is 50 samples (50 samples for each of the high and low ranges) or 100 samples (100 samples for the high range). Step 2:

Pour the whole bottle of C1 powder reagent into the beaker Zhongxin round file (here it is not slippery to divide 50 samples or 100 samples, all of which are poured into the prepared beaker). Step 3: Take distilled water for 50 samples; Please measure 75ml of distilled water for 100 samples (please choose distilled water or purified water for laboratory use, do not use mineral water such as mineral water).

Step 4: Introduce all the distilled water into the beaker that has been filled with the reagent. Step 5:

50 samples were slowly added with concentrated sulfuric acid; 100 samples were slowly added with 5 ml of concentrated sulfuric acid (please use analytically pure or higher grade sulfuric acid ((H2SO4)=, the property is colorless and transparent liquid. Because sulfuric acid is absorbent, the reagent should be sealed and stored immediately after the configuration is completed, and should not be exposed to air for a long time. Step 6:

The test solution is stirred continuously and dissolved completely.

Step 7: Pour all the fully dissolved reagents into the brown reagent bottle for storage. Step 8: Label after preparation is complete and ready for use.

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Summary. Dear dear, it's a pleasure to answer your <>

To dilute the COD high-range water sample by 100,000 times, you can follow the steps below: 1. Take a certain amount of COD high-range water sample and calculate the total volume that needs to be diluted. 2. Prepare a certain volume of purified water, and the specific volume should be calculated according to the multiple of dilution and the total volume to be diluted.

3. Add the diluted water to the COD high-range water sample and stir well. For example, if a 100,000-fold dilution is required, then for a total volume of 1 ml, 100,000 ml (i.e., 100 ml) of diluted water needs to be added. <>

<>4. Finally, according to the requirements of the detection method and instrument you choose, take an appropriate amount of dilution for testing.

How to dilute COD1500 high range + dilution of 100,000 water samples.

Dear dear, it's a pleasure to answer your <>

To dilute the COD high-range water sample by 100,000 times, you can follow the steps below: 1. Take a certain amount of COD high-range water sample and calculate the total volume that needs to be diluted. 2. Prepare a certain volume of purified water, and the specific volume should be calculated according to the multiple of dilution and the total volume to be diluted.

3. Add the diluted water to the COD high-range water sample and stir well. For example, if a 100,000-fold dilution is required, then for a total volume of 1 ml, 100,000 ml (i.e., 100 ml) of diluted water wheelbench needs to be added. Qingyin <>

<>4. Finally, according to the requirements of the testing method and instrument you choose, you can take an appropriate amount of diluent for testing.

<> related extension: 1ml of COD1500 high-range sample wax difference was added to 9ml of distilled water, and a 10-fold diluted sample can be obtained after homogeneous mixing. Then take 1ml from the above 10-fold diluted water sample, add it to 9ml of distilled water, and mix it evenly to obtain a 100-fold diluted water sample.

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By analogy, if you need to dilute to 100,000 times, take 1ml from the dilution of the previous concentration level and add it to 9ml of distilled water, and repeat the above steps to dilute until the slip reaches the desired dilution factor.

If you want to add 10000 COD10000 to dilute it into 5000, it is 10000 (2*5000)=, which means that you need to double the water of the travel bureau, that is, add 2000ml of water.

The standard solution with 100% concentration of COD is diluted to 20% concentration, and it can be calculated that a portion of the standard solution with 100% concentration of COD becomes 20% concentration after adding water, 1 (1+x)=20%, x=4, that is, a sample of 100% concentration of COD standard solution becomes 20% concentration after adding 4 times the water.

Summary. COD 75000mg L liquid configuration in 1 ton of water COD is how much.

The answer has been completed for you, and the process and results are shown in the figure below.