1. Easy Plus UV/VIS spectrophotometers are designed to serve your water testing for chlorine -

https://web.colby.edu/ch141/files/2016/10/CH141Lab7.pdf

2. WTW 3017M DPD Chlorine Analyzer- The 3017M Chlorine Analyzer is WTW's newest online analyzer! This DPD colorimetric analyzer is used for continuous measurements of free or total chlorine in municipal drinking water and wastewater applications using an EPA approved method.

Yes, there are several easy test methods to determine the concentration of dissolved gases in water online. Here are two examples:

1. Plastic bottle method:

This method

As for measuring the amount of chlorine gas injected into the water, there are several methods you can consider:

Regardless of the method you choose, it is important to regularly calibrate your equipment and perform quality control checks to ensure the accuracy of your measurements. You should also establish appropriate safety procedures and measures to protect workers and the environment from any potential hazards associated with chlorine gas.

Lassaad Hedhili

Thank you for your response, but it's not complete. Could you please check it?

Ahmed Hasham

Thanks for your great reply.

It is important to me to be able to register changes online. The conductometry method has been used in the literature in research similar to my research.

Do you know about this method?

you would need a gas-permeable membrane, a conductometric sensor, and a sample of water containing dissolved gases. Here are the steps:

Place the gas-permeable membrane in contact with the water sample.

Allow the dissolved gases in the water to equilibrate with the gas phase on the other side of the membrane.

Use a conductometric sensor to measure the conductivity of the gas phase. The conductivity of the gas phase is proportional to the concentration of dissolved gases in the water.

Convert the conductivity measurement to a concentration measurement using a calibration curve.

Note that this method assumes that the gas-permeable membrane is selective for the dissolved gases of interest, and that there is no interference from other dissolved substances in the water. Therefore, it may be necessary to test the method for the specific dissolved gases and water matrix of interest

Lassaad Hedhili

Thank you for your great response. I was wondering if you let me know how I can find the calibration curve.

Here's an example of how you might prepare a set of standard solutions with known concentrations:

1. Start by preparing a stock solution of the salt at a known concentration, for example, 1 M (moles per liter). You can dissolve a known amount of the salt in distilled water to make the stock solution.

2. From the stock solution, prepare a series of dilutions to create a set of standard solutions with known concentrations. For example, you might prepare solutions with concentrations of 0.1, 0.2, 0.3, 0.4, and 0.5 M. To make these dilutions, you can measure out a volume of the stock solution and add it to a larger volume of distilled water, according to a predefined dilution factor. For instance, if you wanted to prepare a 0.2 M solution, you could add 20 mL of the 1 M stock solution to 80 mL of distilled water, giving a total volume of 100 mL.

3. Mix each standard solution well to ensure that the salt is evenly distributed throughout the solution.

4. Label each standard solution with its known concentration and store them in clean, dry containers until you are ready to use them.

5. To measure the conductivity of each standard solution, you can use a conductivity meter or other appropriate instrument, following the manufacturer's instructions.

By preparing a set of standard solutions with known concentrations and measuring their conductivity, you can create a calibration curve that relates the conductivity of the solutions to their concentrations. This curve can then be used to determine the concentration of unknown samples based on their measured conductivity.