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Sorry, I didn't read all the posts here but fwiw: It is entirely possible for the person performing and analyzing the ICP results to get the Mg number wrong but so far that's been one of the most reliable numbers I've seen come out of ICP-OES testing but still about +/- 50mg/l accuracy. It's also generally the same for at home testing with most Mg test kits except for when using Red Sea's. That is as long as the test is performed properly and the reagents are good. Making sure the color change is complete and not stopping to soon is important.
As for using an ICP-OES results of the major elements to calculate Salinity I have found to be inaccurate and usually lower then actual Salinity. Some times it's close, usually it's with in 2, and sometimes more.
As for using an ICP-OES results of the major elements to calculate Salinity I have found to be inaccurate and usually lower then actual Salinity. Some times it's close, usually it's with in 2, and sometimes more.