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post #1 of 5 (permalink) Old 04-13-2008, 11:18 PM Thread Starter
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overdose

will overdosing KNO3 do harm to the tank water,i have plenty of plants in the in there.I think i have a faulty test kit (API),only a couple months old,I keep getting the same reading on the nitrate test.
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post #2 of 5 (permalink) Old 04-13-2008, 11:29 PM
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I don't know what would be considered a K overdose or what it might do. I think KNO3 is generally considered safer than the nitrate formed by the tank's biofilter. But again, I'm not sure, I make sure to keep N at ~10ppm at all times. I'm sure anything can become toxic at elevated levels.

In regards to the API reagent, the API reps suggest you bang bottle #2 on the table as well as shake it for a minute (rather than the 30 secs the directions advise) . They claim this will avoid false negatives, not sure why it's not written into the directions. Also not sure if it'll affect your readings, but it's worth a shot. If I'm noticing things correctly, you'll see little silvery dots in the drops of N reagent bottle #2 when it's mixed correctly.

Have you tried testing distilled or RO water to rule out false positives? Left C has a calibration technique written up here, somewhere. By using that, I've found my API N reagents to be pretty accurate, maybe a tad off in color by about one ppm (my measurements of K were not done any more exact than a tenth of a gram, so lack of control could have skewed my results), but certainly closer than any of the other cheap reagents I've tested, like the Hagen.
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post #3 of 5 (permalink) Old 04-13-2008, 11:41 PM
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This might help you in your travels. He has a more updated version that I'm sure he'll share with you if you PM him.
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post #4 of 5 (permalink) Old 04-13-2008, 11:55 PM Thread Starter
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tks
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post #5 of 5 (permalink) Old 04-14-2008, 12:29 AM
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np



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