Use 10 ml of water to raise api test accuracy?

[Jake_the_reefer]

So I was dumb and let myself use up all the alkalinity reagent from my hanna checker before ordering more. I am currently fine tuning my daily dose so I can set up a dosing pump.

All I have is an api alk test which is accurate to intervals of 1.
1 drop = 1 alk
2 = 2 alk so on and so forth
The test is accurate from what I can tell. My alkalinity is 7.9 and the api changed to the finish color at 8 drops. Can I raise the resolution to .5 intervals by using 10ml of water instead of 1

 

[Jake_the_reefer]

I will be using the api test until I get my hanna reagent just so I can see if alk has made any big drops or raised too high

 

[Magellan]

If you already know about what your alk is, just start with 5 or more drops before you start adding one at a time like the test says. From using this test often it seems to me the issue arises from constantly taking the cap on and off to add a new drop of liquid, but it does test fairly consistently in my experience. My tip would be to get a syringe in order to add the exact same amount of water to the tube every time.

 

[Randy Holmes-Farley Verified Community Expert]

Yes, you can reduce some of the uncertainty in an alk titration test by using a larger volume of tank water. In my diy titration i use 100-250 mL.

 

[Jake_the_reefer]

Yes, you can reduce some of the uncertainty in an alk titration test by using a larger volume of tank water. In my diy titration i use 100-250 mL.

Oh cool. I wanna use 10ml then it will bring up the accuracy

 

[jduong916]

Does anyone know what the volume of a drop is using the api test kit? I was thinking i could fill a 1ml syringe with the titrant and get more accuracy that way. I just dont know what the volume of a drop is. I did a google search and it kinda said 0.05 ml per drop.

 

[Randy Holmes-Farley Verified Community Expert]

Does anyone know what the volume of a drop is using the api test kit? I was thinking i could fill a 1ml syringe with the titrant and get more accuracy that way. I just dont know what the volume of a drop is. I did a google search and it kinda said 0.05 ml per drop.

Drop sizes depend on the physical dimensions and material nature of the tip (and the fluid used). So any drop size info not specific to the dropper in question is of marginal benefit.

 

[jduong916]

Drop sizes depend on the physical dimensions and material nature of the tip (and the fluid used). So any drop size info not specific to the dropper in question is of marginal benefit.

I can probably drip out ten drops and suck it up with a syringe. Hopefully I get all the juice lol.

 

[Randy Holmes-Farley Verified Community Expert]

I can probably drip out ten drops and suck it up with a syringe. Hopefully I get all the juice lol.

IF you have a mg scale, you can weigh it.

 

[Nano_Man]

You can have my api