What technique can be used to monitor carbon dioxide in natural waters?

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MD. AMIRUL ISLAM

Did you try dCO2 meter? The following link claims to have a good dCO2 meter.

https://www.mt.com/int/en/home/products/Process-Analytics/DO-CO2-ozone-sensor/dissolved-carbon-dioxide.html?cmp=sea_16010123&SE=GOOGLE&Campaign=MT_PRO_EN_ROW_Ingold&Adgroup=CO2+-+dCO2+Meter+-+Bridge&bookedkeyword=%2Bdissolved%20%2Bco2%20%2Bmeter&matchtype=b&adtext=374716213145&placement=&network=g&kclid=_k_CjwKCAiA2O39BRBjEiwApB2IkpPQwr16Ep_F-6u_XuqUyNsTclHqsRrwTWh99GDb41OrPnTxz3fq7hoC5NgQAvD_BwE_k_&gclid=CjwKCAiA2O39BRBjEiwApB2IkpPQwr16Ep_F-6u_XuqUyNsTclHqsRrwTWh99GDb41OrPnTxz3fq7hoC5NgQAvD_BwE

Hussein Abdel Halim Abdel Halim El Gammal

There are portable sensors available in the market for dussolved CO2 in water.pl have a look to web sites for water quality sensors