When I analyze the Al content in groundwater, I found that there is a relation between Al-pH. When pH low Al3+ is solube very high, then increasing pH Al3+ decrease, but it increases again when pH is above 6. From lab test, I found a hyperbol relation between Al3+ and pH (2,8-6). I don't care type of pH yet. Do you know some published references relate to this topic?
Dear Tu,
You rediscovered something well known. Aluminium is amphoteric - that is, it is soluble in low pH solutions and in high pH solutions, but pretty insoluble at intermediate pH. Any chemistry textbook should show a graph of the solubility of Al as a function of pH. If it doesn't, buy a better textbook.
Dear Tran Anh Tu,
Here is a short explanation of the hydrolysis of metal ion in aqueous media: http://classes.uleth.ca/200501/chem2810a/lecture_8.pdf
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