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纤维水镁石在水中可放出自由基 ,其在酸性环境中呈现化学活性 ,在体液环境中有细胞毒性。在水体环境中 ,它与一切释放出铵离子的物质反应并使自身发生溶解 ,其机理是可溶性铵盐在溶液中可离解出铵离子并放出质子 ,而水镁石在水中可电离出羟基。二价铁的存在使氧化还原反应常常伴生 ,最终形成三价铁铵盐复盐。因此 ,人体内的可溶性铵盐和体液中存在的铵离子可与水镁石粉尘作用并使之部分溶解。粒度增大和温度升高有利于镁元素在平衡体系中溶解量的增加。高浓度铵盐在较高温度下具有良好的溶解能力。平衡溶液中镁、铁离子的总量取决于生成复盐的溶解度 ,反应的速度是由铵盐电离的速度和水镁石电离的速度共同决定的。NH4Cl(1 .2 5mol/L)、(NH4) 2 SO4(0 .5mol/L)、NH4HSO4(1 .2 5mol/L)在 40～ 80℃条件下是既能防止Fe2 + 氧化或产生沉淀 ,又能使水镁石很好溶解的铵盐
Fiber brucite can release free radicals in water, which is chemically active in acidic environments and cytotoxic in body fluids. In the environment of water, it reacts with all substances releasing ammonium ions and dissolves itself. The mechanism is that soluble ammonium salts can dissociate ammonium ions and release protons in solution, while brucite can ionize hydroxyl groups in water. The presence of ferrous iron makes the redox reaction is often accompanied by the final formation of ferric ammonium salt double salt. Therefore, the soluble ammonium salts in the human body and the ammonium ions present in the body fluid may act and partially dissolve the brucite dust. Increasing particle size and increasing temperature are beneficial to the increase of the dissolved amount of magnesium in the equilibrium system. High concentrations of ammonium salts have good solvency at higher temperatures. The total amount of magnesium and iron ions in the equilibrium solution depends on the solubility of the resulting complex salt. The rate of reaction is determined by the rate of ammonium ionization and the rate of brucite ionization. Under the condition of 40-80 ℃, NH4Cl (1.25 mol / L), (NH4) 2SO4 (0.5 mol / L) and NH4HSO4 (1.25 mol / L) can prevent the oxidation or precipitation of Fe2 + Also make brucite well dissolved ammonium salt