Sodium thiosulfate solution volume calculation

[Charles Silva]

Hello all

I´m going to use a liquid sodium hypochlorite @ 12% to disinfect sea water for a microalgae cultivation project.

For it, some authors suggest 0.5 mL of NaClO @ 12% for every 10 L of sea water.

I have a solution with 100 g of sodium thiosulfate in a 1 L of RO water that I would like to use to neutralize the chlorine.


I kindly ask someone with a chemistry background help me understanding how do I calculate some variables.

- How do I calculate the final chlorine concentration in my 10 L sea water solution ?
- What is the volume of my sodium thiosulfate solution to neutralize it ?
- And instead using sodium hypochlorite @ 12% if I use @ 2.5% should I add 5x more ?



Thanks in Advance
Charles Silva
Rio de Janeiro - Brazil

 

[Hemmdog]

Bump

 

[Charles Silva]

I found this useful calculator.

According some authors the chlorine concentration to disinfect sea water is 5-10 ppm.
So with this calculator we can play with the concentration of the bleach product and the desired final volume and chlorine concentration.

Chlorine Dilution Calculator | Public Health Ontario

Calculates how much bleach product to dilute with water to get your desired concentration (ppm) of chlorine solution.

www.publichealthontario.ca

For a 10 L of sea water with final 5 ppm concentration of chlorine we need 0.44 mL @ 12 %

But I'm still looking for a sodium thiosulfate concentration to neutralize it.