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Thanks for the info, however The vials used are non reactive with seawater or constituent elements. (Confirmed long ago with Triton). The vendor you mentioned earlier had claimed that Trident was more accurate than an ICP as the Ca value varied between a Trident test and the ICP, so when you mentioned Trident, I assumed this to be the same source of “info”...
You can easily verify this (if ultra paranoid) by noting the manufacturer or plastics code on the vials and verifying reactivity.
Sometimes we over think things massively. An ICP is going to be more accurate than a hobbyists’ home test kit.
A valid cause of variation however, would be the presence of different compounds containing Phosphorus, which would skew the results when you perform the PO4 calculation, as it assumes all phosphorus is bound in PO4. Examples of this could be various forms of inorganic phosphorus, which are generally in particulate suspension. In the reef tank, a possible source would be flocculate from Lanathium Chloride dosing.
A 0.2um filter can used to remove such particulate matter prior to the sample being nebulised in the ICP-OES.
Merry Christmas to you, hope you enjoy some great time with the family.
Guess you didnt read the part where I said "not interested in debating this further". I didnt read your response, sorry