Discussion on the analysis of calcium and magnesium contents in saline water
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Recently, when testing the calcium and magnesium levels in saltwater, magnesium was not detected at all, while the calcium level was around 0.0004–0.0016 g/L. Therefore, I monitored the entire process from sampling in the morning until the testing was done. The sampling itself was fine; first, calcium was tested using an EDTA concentration of 0.01 N. After that, the total amount of calcium and magnesium was determined. However, once the chrome blue black indicator was added, the solution turned blue immediately. I would like to know what could be the reason for this
http://bbs.hcbbs.com/thread-668006-1-1.html The original poster can take a look at this post to see if it’s helpful.
Of course I know. What I mean is, can we conclude that there is no magnesium based on this phenomenon?
Thank you. I’ve taken a look; it seems to be because, as that post says, chromium black T has a very low response to calcium in the absence of magnesium