hedone
04-21-2013, 11:38 PM
Can we, or has anyone, made a good list of how pH correlates with other parameters?
Like hardness, temp, ammonias, nitrites, nitrates, salinity, EC, TDS, TDG, oxygen, co2, the specific macro and micro nutrients for aquaponics (Nitrogen, Potassium, Phosphorus, Calcium, magnesium, sulfur, iron, boron, zinc, molybdenum, etc...)
I guess we should first list things which people use to adjust pH, if you can add to that...
Raises pH - Lime, potassium bicarbonate... ?
Lowers pH - Phosphoric acid, hydrochloric acid... ?
Anyhow, I'll start with temperature...
Temperature up, pH down.
Temperature down, pH up.
More specifically, pure water has a pH of 7, only at 25C (77F).
At 60C (140F), it will have a pH of 6.96, nothing a pH test strip can detect, although, I imagine this factor could change, in not so pure water, creating larger variances.
So apparently, and do correct me if I'm wrong, but a 0.818% increase in temperature, lowered the pH by 0.005%, does that mean that a 45% drop in temperature raises the pH by 0.005% too? Wow, that was a weird thought. Anyhow, what more could you add? Would you like to do another parameter, like ammonia? Hey, aren't there a couple main types of ammonia? Yes, come to think of it, which is dominate may correlate with oxygen levels, but I forget.
Like hardness, temp, ammonias, nitrites, nitrates, salinity, EC, TDS, TDG, oxygen, co2, the specific macro and micro nutrients for aquaponics (Nitrogen, Potassium, Phosphorus, Calcium, magnesium, sulfur, iron, boron, zinc, molybdenum, etc...)
I guess we should first list things which people use to adjust pH, if you can add to that...
Raises pH - Lime, potassium bicarbonate... ?
Lowers pH - Phosphoric acid, hydrochloric acid... ?
Anyhow, I'll start with temperature...
Temperature up, pH down.
Temperature down, pH up.
More specifically, pure water has a pH of 7, only at 25C (77F).
At 60C (140F), it will have a pH of 6.96, nothing a pH test strip can detect, although, I imagine this factor could change, in not so pure water, creating larger variances.
So apparently, and do correct me if I'm wrong, but a 0.818% increase in temperature, lowered the pH by 0.005%, does that mean that a 45% drop in temperature raises the pH by 0.005% too? Wow, that was a weird thought. Anyhow, what more could you add? Would you like to do another parameter, like ammonia? Hey, aren't there a couple main types of ammonia? Yes, come to think of it, which is dominate may correlate with oxygen levels, but I forget.