30 minut temu, Arek77 napisał:w teście kropelkowym i tak cały fosfor pròbce zamieniany jest na fosfor organiczny i wtedy mierzymy poziom ortofosforanów.
A w jaki sposób? Przecież tam w reagentach nie ma ani kwasu siarkowego, ani nadsiarczanów? W kropelkach i fonometrach mierzy się tylko nieorganiczne forforany!
"A final point is that organic phosphates are not detected by most test kits designed for hobbyists. Those that do detect organic phosphates, e.g., Hach PO-24, break the phosphate off the organic compound, thereby converting it into inorganic orthophosphate prior to testing. These kits are tedious to use and expensive, however, so they’re not for every hobbyist. Indeed, I’ve never used one.
Testing by ICP (inductively coupled plasma) by a commercial enterprise such as Triton or ENC Labs will give a value for total phosphorus, including both organic and inorganic forms. Depending on how the sample is prepared and processed, the organic forms may be individual molecules dissolved in the water, or larger aggregates, all the way up to and including whole bacteria (although Triton says these are removed before testing). Now that larger numbers of reef aquarists are getting ICP testing done, it does not appear that total phosphorus/phosphate is noticeably higher than what those same reefers are getting with test kits, so the organic forms may often be a minor contributor to total phosphate in many reef aquaria."
Za:
https://www.reef2reef.com/ams/phosphate-in-the-reef-aquarium.9/