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06/15/2011, 12:41 PM
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#1 |
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Registered Member
Join Date: Sep 2009
Posts: 395
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What instrument is used for true po4 reading?
I've used test kits and the Hanna checker both unreliable I found!
What instrument is used to get a exact reading? Is there a lab to send ur water too that will test just po4 for u? Thanks Matt |
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06/15/2011, 12:50 PM
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#2 |
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-RT * ln(k)
Join Date: Sep 2010
Location: Little Rock
Posts: 9,705
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I have two good methods, unfortunately the instruments involved are all $500K plus. For the hobby, the Hanna is about as good as it gets. Any other affordable methods would also be colorimetric.
FWIW: In analytical chemistry there is no such thing as knowing the "exact" concentration of anything. You can only know to the level of your measurment technique.
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David Current Tank: Undergoing reconstruction... |
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06/15/2011, 01:06 PM
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#3 |
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-RT * ln(k)
Join Date: Sep 2010
Location: Little Rock
Posts: 9,705
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Here's a citation to a similar method if you are interested in researching further. I have a little bit superior mass spec, so I can beat this level of sensitivity by about an order of magnitude on a good day. At home I still use the Hanna.
On-line determination of dissolved phosphate in sea-water by ion-exclusion chromatography inductively coupled plasma mass spectrometry Lu Yang, Ralph E. Sturgeon and Joseph W. H. Lam J. Anal. At. Spectrom., 2001, 16, 1302-1306
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David Current Tank: Undergoing reconstruction... |
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