Guile
Active Member
Hope you don't think I'm stressing, I like these sorts of things... its interesting to look back and see where I make my mistakes. I just hope your not getting too frustrated or feeling talked down upon, there is no intent for that here (but I know how it can feel when its hard to read the language)...yeah im not agrueing,, AT ALL,,,,I like the 3 drop thing,wish i had a ppm meter...right,would that be helping me...
so i wonder when the contamiates will show up,,,tonight,tomorrow,,beginners luck @ 100%
A PPM (TDS) meter might confuse things further at this point... They work by converting the electric conductivity into a ppm (or Total Dissolved Solids) reading. The odds are that your Dip'n Grow will not read 15,000ppm (10,000 IBA plus 5,000NAA) and the water you use to dilute it is unlikely to be 0...
We are just working with weight and volume here.. We assumed that the Dip'n Grow had a specific gravity around that of pure water 1.0 (thats 1 kilogram per liter). for comparison sake 100 proof alcohol has a specific gravity around 0.9 and "Kool aid" has a specific gravity around 1.1 (think about how much sugar you use to make that crap)..
Assuming the Dip'n Grow (concentrate) had a specific gravity between that of 100 proof vodka and Kool aid (say the specific gravity of water, 1.0) we speculated that 1% of the 1 kilogram that a liter of Dip'n Grow weighs should be IBA weighing about 10 grams (within a 10% margin of accuracy).
Latter we were validated when the mixing instructions were brought to light.. They clearly state that there is in fact 10,000ppm IBA in the undiluted Dip'n Grow concentrate.. This means that it has a specific gravity of 1.0, that there is in fact 10,000 miligrams (or 10 grams) of IBA in a liter of Dip'n Grow weighing 1 kilogram (1,000 grams).
Now its just a matter of figuring out how many parts containing 10,000ppm (10,000mg/L) we need to dissolve in a larger volume of water to obtain 1.5mg IBA per liter (1.5ppm).
We know that a "drop" is considered to be 1/20th of a milliliter, and a milliliter is considered to be 1,000th of a liter (There are 20,000 drops in a liter.).
If we wanted say 1ppm (1mg/L) IBA and our concentrate is 10,000ppm (10g/L) we would simply dilute it to 10,000 times its volume with water (our solvent of choice).
So 1 drop of Dip'n Grow to 9,999 drops water (to make 10,000 parts total) would give us 1ppm (1mg/L) IBA. We know there are 20,000 drops in a liter so 10,000 drops would be 1/2 liter (or 500ml)
But we want 1.5ppm (1.5mg/L) thats 50% more than 1.0 so if we doubled the water but added triple the concentrate we would get a 50% stronger solution making 1.5ppm (1.5mg/L)..
Thats 3 drops per liter...
I think I might keep confusing the issue by giving you the 1ml per 7 quart thing but what I am really saying is 1ml per 6.666 liters. The thing is that 6.666 liters just seems like an odd measurement to work with (I can see someone using more than one measuring device in an attempt to be accurate) 7 quarts are equal to 6.624 liters which is only 42 milliliters off (that's better than 1% accuracy) If you realy wanted to be a stickler you would just add a teaspoon extra water to each quart, and another one for good measure (but now you are using a second measuring device again, which kinda defeats the purpose. Besides do you really need to be under 1/2 if 1% accurate?)