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Concentrations of Ga and Ca ions measured by ICP (inductively coupled plasma emission spectroscopy), which was released from Ti subjected to (a) NaOH; 100Ca + 0.05Ga and heat treatment, and subsequent (b) water treatment; or (c) NaOH, 100Ga and heat treatment, and subsequent (d) water treatment as a function of square root of soaking time in PBS.
