I am trying to generate the PAW with negative ORP of 650mV and 8 to 9 pH using non-thermal plasma jet in air for biomedical applications. But some sources says that PAW having 700mV ORP and 8 to 9 pH can be a good alternative of pesticide in agriculture applications. How can we make PAW with 8 to 9 pH and positive ORP of 700mV.
Hi,
I’m not an expert in this particular field, but Plasma-activated water with pH 8-9 appears to be something strange for me. For plasmas sustained in air, the formation of nitrogen oxides and its subsequent dissolution in water will always result in a decrease in the pH. The majority of the literature report a pH < 5 (often 2-3, but the actual value depends on the type of plasma source and the applied operational settings).
If you really want to achieve an alkaline pH, adequate buffering is necessary (i.e phosphate buffer for the range 7-8) but for sure it buffering will affect the chemistry.
Why are you so interested in reaching pH = 8-9? Which application do you have in mind?
Regards,
Niels
Hi Niels,
Yes, you are right about the reduced pH with air plasma generated in water. The activated water but not having acidic property can be useful in biomedical applications.
Thanks & regards,
Vishal