How to make CDS using the BOCAL method?

Important warning

The manufacture and use of chlorine dioxide (CDS) requires strict precautions. It is essential to handle the substances in a well-ventilated environment, with adequate protection (gloves, goggles, mask). Chlorine dioxide is a powerful chemical that can pose health risks if mishandled.

Necessary equipment

To make CDS using the BOCAL method, you will need:

• An airtight glass jar (storage jar type)

• A small glass bowl

• Distilled water (quantity varies depending on the desired dosage)

• 4% hydrochloric acid (HCl)

• 25% sodium chlorite (NaClO2)

• A graduated syringe for dosing

• A well-ventilated space away from any heat source

• Gloves and protective glasses

Dosages

The quantities of distilled water and reagents vary depending on the concentration and quantity of CDS you wish to obtain. Please refer to the dosage table to precisely adjust the proportions. The dosages given here are for guidance only and should be adapted according to your needs.

DOSAGES OF REAGENTS FOR THE MANUFACTURE OF CDS WITH THE JAR METHOD

What is CDS?

CDS (Chlorine Dioxide Solution) is a solution that contains only chlorine dioxide gas dissolved in distilled water. It is essential that the reagents (sodium chlorite and hydrochloric acid) are never mixed directly with the distilled water in the jar. If the reagents come into contact with water, it would result in a solution containing reagents, which is not CDS. Chlorine dioxide gas must be generated separately and dissolved in water to obtain the CDS solution.

Walkthrough

CDS MANUFACTURING DIAGRAM JAR METHOD

1. Preparing the jar

• Fill the jar with the amount of distilled water corresponding to your dosage.

• Place the floating cup on the water.

2. Preparation of the reactive mixture

• In the cup, first add the 25% sodium chlorite .

• Next, slowly add the 4% hydrochloric acid to the dish , but never let these reagents come into contact with the distilled water in the jar. They should only interact with each other in the dish, not in the water.

3. Formation of chlorine dioxide

• Immediately close the jar tightly. Chlorine dioxide gas will be released into the cup and slowly dissolve in the distilled water in the jar.

4. First saturation (24 hours)

• Leave to act for 24 hours at room temperature in a dark place.

5. Refrigerate after the first saturation

• After 24 hours at room temperature , place the jar in the refrigerator.

• Check that the color of the cup and the water in the jar match. This means the reaction is complete and the chlorine dioxide is properly dissolved in the water.

6. Second saturation (24 hours)

• Once the color is consistent between the cup and the liquid in the jar, discard the contents of the cup and prepare a new reaction mixture with the same proportions.

• Close the jar tightly and leave to stand for another 24 hours .

• Repeat the same check : after 24 hours, put the jar in the refrigerator and wait until the color of the cup and that of the water in the jar are the same.

7. Filtration and storage

• Once the time for the second saturation has elapsed, carefully open the jar.

• Transfer the resulting solution into an amber glass bottle with a tight-fitting cap.

• Store the solution in the refrigerator .

Precautions and storage

• Safe handling : Never inhale chlorine dioxide vapors directly.

• Storage : Keep the solution in a dark glass container, cool, refrigerated and away from light.

Noticed

This guide is provided for informational purposes only. All handling is at your own risk. Ensure you follow all necessary safety standards.

This method involves risks and dangers. We are absolutely not responsible for any improper execution of this method, and you must take all necessary precautions to ensure your safety.