Am I doing it right or wrong?

[Fishingandreefing]

It’s so confusing so I am here to verify with all you reefers that uses the Red Sea Magnesium test kit.

When drawing the 1ml of Titrant, there’s an air bubble which is correct based off of the Red Sea YouTube video. But I can’t be sure if the end result from the video has an air bubble.

Anyway, so my result is .60 used thus the mag is 1200?

Hanna checker, please make one lol.

 

[sealife4life]

It’s ok for air bubble. The “missing” liquid is in the tip of syringe

 

[Fink]

i just went through this same headache when I started using the salifert MG test kit. What @sealife4life said is spot on,

 

[sealife4life]

Your remaining liquid is .28 so then on the left you would be looking at the .72 to equal 1ml. So magnesium is at 1440. I use their kit for testing and was very confusing in the beginning. I think I’m doing it right

 

[socal562]

I had that same ?

 

[sealife4life]

Or .26 which would be 1480

 

[Fishingandreefing]

Or .26 which would be 1480

That’s what I though way back but it’s apparently WRONG. you should only read the black rubber ring when you draw at the 1ml mark and at the end you don’t read the liquid.

 

[Fishingandreefing]

So let say you draw based on the 1ml mark leaving the bubble which shown -.02 but then at the end you read the liquid line, that doesn’t make any sense. So am pretty sure at the end you read the black rubber ring just like the video.

 

[sealife4life]

So let say you draw based on the 1ml mark leaving the bubble which shown -.02 but then at the end you read the liquid line, that doesn’t make any sense. So am pretty sure at the end you read the black rubber ring just like the video.

When I initially draw it’s always above the .9 mark. So I align liquid with the .9 mark. Idk where the rubber is at that point but assuming it’s at the 1ml. Then in the end adding .1 for liquid in tip to what is left in syringe. So in his case .16 is what you see left in syringe, plus .1 for liquid in the tip, equals .26

 

[Randy Holmes-Farley Verified Community Expert]

FWIW, folks can see the correct way to read a syringe for any test kit here:

Reef Chemistry Question of the Day #161 Using a Syringe

Reef Chemistry Question of the Day #160 I have just drawn tank water into a syringe with a tip (shown below, including a blowup of the barrel). The blue coloration shows where the fluid is. When I started to draw fluid in, the tip and syringe were empty and the plunger was all the way in...

www.reef2reef.com

 

[Fishingandreefing]

When I initially draw it’s always above the .9 mark. So I align liquid with the .9 mark. Idk where the rubber is at that point but assuming it’s at the 1ml. Then in the end adding .1 for liquid in tip to what is left in syringe. So in his case .16 is what you see left in syringe, plus .1 for liquid in the tip, equals .26

But in my case, if I draw and stop at the 1ml mark with the air bubble just like in the video. Then at the end, I MUST do the reading by the black rubber ring otherwise it would be off.

maybe someone can explain better or confirm this, but I am pretty sure that’s how it measures.

 

[BostonReefer300]

Bring bottom of black rubber to exactly the 1 mL mark. Then read final measurement also at the bottom of the black rubber. If the black rubber stops at 0.3 mL, then you have used 0.7 mL of reagent and your Mg is at 1400 ppm.

 

[amazongb]

If your end point is .40, then you've used .60, for a mag of 1200 ppm. Salifert test is very similar, but not as confusing because the Salifert chart reads how much titrant is remaining, not how much is used.

The air bubble represents titrant in the pink tip + the titrant in the tip of the syringe, this is not .1ml together, it approx .014ml. The syringe without the added pink tip attached has .1ml in the tip.

You can run the same test again without the pink tip and without an air bubble and see what you end up with, it should be the same.

 

[Randy Holmes-Farley Verified Community Expert]

But in my case, if I draw and stop at the 1ml mark with the air bubble just like in the video. Then at the end, I MUST do the reading by the black rubber ring otherwise it would be off.

maybe someone can explain better or confirm this, but I am pretty sure that’s how it measures.

The link I gave makes the proper way to use a syringe perfectly clear.

Wherever you measure from on the plunger, just use the same point and look at the difference between those points as the plunger travels. Always ignore the air. Usually it is easiest to just use the point on the plunger where it hits 0 when fully pushed in.