Red Sea Phosphate test confusion
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Old 02-13-2004, 01:12 PM   #1
arisk
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I purchased a Red Sea phosphate test kit. I've never used any phosphate test before.

The colour I get doesn't seem to match anything on the chart.
I get a sky blue colour, somewhat like a zero nitrite reading using a AP nitrate test kit, if that is a good comparison. It might be slightly darker though.

It is definitely not a a green tone like those of the 0.1 to 1.0 range and not of a navy blue like the 2.0 and above.

I tried the 12:1 dilution as well and get a similar colour.

Any ideas?

Thanks,
Al
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Old 02-13-2004, 02:14 PM   #2
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that's the test kit I'm using. On the color chart I have there is a color that is turquoise-ish. Is that possible what yours is?
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Old 02-13-2004, 02:19 PM   #3
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I don't see any hint of green in my test.
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Old 02-13-2004, 02:32 PM   #4
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are you looking down the top where the top level is 20cm from the card? Using "white" light?
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Old 02-13-2004, 02:34 PM   #5
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You have to open the test tube, and look from above through all 12 ml of solution. Works fine for me...
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Old 02-13-2004, 02:38 PM   #6
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Yes, doing both of those.

As far as I can tell, I'm following the instructions to the letter.

Is it normal for reagent B to be thick and syrupy?
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Old 02-13-2004, 02:58 PM   #7
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I have sent an email to Red Sea asking for their opinion.

Interestingly, while looking for a link to their site, I noted on the MOPS site a picture of the test kit chart which seems to have the colour I refer to.

At:
http://www.mops.ca/cgi-bin/SoftCart....8b9+1076690482

The 4th colour down is approximately what I have.
Of course I realize this isn't a high resolution picture and the colours won't necessarily be accurate. It just seems strange this matches.
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Old 02-13-2004, 03:15 PM   #8
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that looks like the card I have. The chart I have goes from 0,0.1,0.2,0.5,1.0,3.0. Is it possible that it just looks that blue to you? I know I have a hard time with some of these color cards. the 1.0 color on mine I would say closer to an ocean blue than a sky blue, depending on what color light I'm looking at it with.
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Old 02-13-2004, 03:35 PM   #9
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My card has the same increments.
While the one on the MOPS site is somewhat orange for zero, mine is 100% yellow. Which is yours?
For reference, my 0.5 level looks much like the fins on the cute fish with the mop on that same site. Of course monitors can render colours differently.
The only level on mine that is 100% blue is 2.0 and above and that is what I would call navy blue (dark).
From 0.1 - 1.0 transitions from a light green, through blue/green. The green decreases and the blue increases as levels go up. Even at 1.0 though there is still a small green tinge.

I know what you mean about some colour charts, but the colour I get looks nothing like anything on my chart. It is a light blue with no green component at all. It's not just a matter of intensity/darkness like I've seen with some charts. This is a different colour.
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Old 02-13-2004, 03:37 PM   #10
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Yes, reagent B (glycerol) is thick and syrupy. Since it drops down straight to the bottom, you need to make sure it is dissolved well, by turning the tube around and shaking until you don't see anymore slurries.
Perhaps the testkit is expired? Can you test tap water and see what color you get? Distilled water, and then add a known amount of Fleet Enema or KH2PO4, and measure again? Could be a bad test kit...
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Old 02-13-2004, 03:51 PM   #11
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Other test kits I've had for nitrite, nitrate etc. say to vigorously shake and this one said "gently".
It is possible I took that too literally. I'll try a test with more mixing. Good suggestion.

I'm just getting into this and don't have any fleet around without going out and buying it. Is there any other household product I might have?

A test of tap water showed between 0 and .1, by my interpretation. I've yet to check distilled.
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Old 02-13-2004, 03:59 PM   #12
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I get the same reading from my red sea po4 kit. When I get that greenish blue color I pretty much call it 1.5 ppm. It all depends if it looks more green (lower=1.25) or if its more blue (higher=1.75). You know if its solid blue its around 2.0. It is a bit confusing and it would help if they had a 1.5 color to match up to on the chart but its still a decent kit to have.
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Old 02-13-2004, 06:20 PM   #13
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mine is the same as yours and mine is syrupy too. So far I'm having a hard time getting any phosphates in my tank.
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