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铝对输配水系统及人体健康的影响主要与其存在形态有关.本研究采用硫酸铝模拟配水考察了水温和pH对溶液中铝形态分布的影响情况.考察的主要铝形态包括单核铝、溶解铝、悬浮铝和多核铝;采用的形态分析方法为荧光分光光度法.结果表明:当pH=6.5时,悬浮铝为饮用水中铝的主要存在形态,在总铝中的质量分数为62.2%;而当pH>7.0时,单核铝为主要形态,且随反应时间的增加变化不大.各水质条件下的多核铝浓度均较低,且随反应时间的变化也不大.水温对铝形态的影响与pH是一致的,由pOH可将二者统一起来.通过调节pOH可以实现饮用水中铝形态的控制,这将对输配水系统的运行管理及铝毒性控制提供理论依据.
The effects of aluminum on water distribution system and human health are mainly related to their existing forms.In this study, aluminum sulfate simulated water distribution was used to investigate the effects of water temperature and pH on the distribution of aluminum species in solution.The main aluminum species investigated included mononuclear aluminum, Aluminum, suspended aluminum and polynuclear aluminum.The morphological analysis method used was fluorescence spectrophotometry.The results showed that the suspended aluminum was the main form of aluminum in drinking water when pH = 6.5, and the mass fraction of total aluminum was 62.2% , While the mononuclear aluminum was the main form at pH> 7.0, and did not change much with the increase of reaction time.The concentrations of polynuclear aluminum under each water quality condition were low and the change with reaction time was not significant.The effect of water temperature on the aluminum The effect of morphology is consistent with pH, and the two can be unified by pOH.The control of aluminum form in drinking water can be achieved by adjusting pOH, which will provide theoretical basis for operation management and aluminum toxicity control of water distribution system.