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Re: [APD] Estimative Index for CO Dosing - Bah!



One last try to post the chart:   
http://www.aquaticplantcentral.com/forumapc/science-of-fertilizing/ 
14281-another-co2-chart-to-try.html#post97530

On Wednesday, March 8, 2006, at 01:13 PM, Vaughn Hopkins wrote:

> I see my chart didn't make it.  Try this pdf version:
> On Wednesday, March 8, 2006, at 01:05 PM, Vaughn Hopkins wrote:
>
>> If I assume that water in equilibrium with the atmosphere will have  
>> about 3 ppm CO2 in it, the equation for CO2(ppm) can be changed to:    
>> CO2=3*10exp(7-PH)*10exp{PH(for overnight rested sample)-7}.  And,  
>> this reduces to CO2=3*10exp(change in PH from equilibrium sample to  
>> tank sample).  Therefore, to get 30 ppm, the increase in PH for the  
>> sample sitting overnight would be 1.0.  And, calculating ppm CO2 for  
>> various changes in PH gives this chart:
>> Comments???
>>
>>
>> Vaughn H.
>>
>> On Wednesday, March 8, 2006, at 10:54 AM, Jerry Baker wrote:
>>
>>> All you
>>> are really doing is measuring a known quantity of CO2 and then  
>>> adjusting
>>> the curve of the KH/pH/CO2 relationship to match observations. It
>>> doesn't change anything.
>>>
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