Serial dilution baby. You said it. Only way to go in my opinion when it comes to these compounds unless one likes trading with the devil!Someone messaged me with a question recently about making custom micros. I thought I would answer it here as kind of a PSA on how I make mine. So if you don’t make custom micros this won’t be of much interest. For those who do it might help make it easier for you.
There are three components to micros that are measured in VERY small amounts, Copper Sulfate Pentahydrate (CuSO4*5H2O), Sodium Molybdate (Na2MoO4*2H2O), and Nickel Sulfate Hexahydrate (NiSO4 6(H2O)). The measurements are small fractions of a gram. That’s tricky to get right.
For my micros I make a 1000ml (1000ml = 1L) solution that adds the following per 20 ml dose to my 105 gallons of actual water volume: Copper at 0.00086, S. Molybate at 0.0005, and Nickel at 0.00142 ppm. In order to make that solution I would add 0.067 gm of Copper, 0.025 gm S. Molybate , and 0.0126 gm of Nickel to the solution. If anyone has tried measuring these small amounts you know what a pain it is, and the likelihood of it being correct is probably slim.
There is another way. I make a separate 1000ml solution of just these items.
So let’s look at Copper. If I was doing it the traditional way, I would add 0.067 gm of Cu into my solution. If I calculate that I find that 0.067 gm of Cu into 1000ml raises the concentration of that 1000 ml to 17.05 ppm. This is key. The amount of Cu I would add the old way brings that 1000ml solution to 17.05 ppm.
So instead of doing that, I will make a solution that raises 1000ml to 17.05 ppm Cu. In my case I make it so that 60 ml will raise 1000 ml to my target levels.
Still with me?
So again, I am creating 1000 ml solution so that a 60 ml dose will raise 1000 ml (1L) to 17.05 ppm Cu. To do so I need to add 1.1165 grams to the solution. This is much easier than measuring out 0.067 grams each time you make a new batch.
And then it’s so on and so forth for the other components. When I’m done I have a solution that will make about 16 batches of micros. That is a long time! I can tell you that it makes putting together your micro solution batches MUCH faster, easier, and less of a chore.
Now I need to go lie down for a while with a cold compress on my forehead!!
If only you used the IFC Calculator (DIYTraceCalculator sheet to be specific) to make those serial dilutions, you wouldn't need to lie down and use those cold compress on your forehead!! Zeus and I specially got our heads and faces banged, trashed, hurt and disfigured at length for you all to have a peaceful and less painful, compress-free life. 😇Now I need to go lie down for a while with a cold compress on my forehead!!
@Zeus. knows what I am talking about and will vouch for that statement, I'm sure.😅
Jokes aside, Zorfox's calculator works great and has also been one of the source for the making of the IFC calculator, so credits also go to Zorfox's. A quick note though, we have detected the same 3 or 4 miscalculations in both Zorfox calculator and Rotala Butterfly, which is not surprising as they are based one on each other. Luckily @fablau has been made aware of those bugs through the past 2 years and has fixed them in the Rotala Butterfly calculator.