Dispersion and aggregation behavior of nanoparticles in aquatic environment may be affected by pH, salinity, and dissolved organic matter, which would change its ecological risk. Effects of time, power and temperature on the alumina nanoparticles (nano-Al 2 O 3 ) ultrasonic dispersion in water were discussed. Al 2 O 3 had a best ultrasonic dispersion for 30 min at 105 W and 30 °C. The concentration of Al 2 O 3 could be measured by ultraviolet (UV) spectrophotometer, and the method was efficient and accurate. Furthermore, the sedimentation rate of Al 2 O 3 was related to pH, salinity, and its concentration in the artificial seawater. When pH was 7.31, approaching the isoelectric point of Al 2 O 3 , they aggregated and settled fastest. Settlement coefficient ( k ) of Al 2 O 3 increased by 3 and 2.7 times while the salinity and its concentration increased. The sedimentation rate was higher in natural seawater than that in artificial seawater. All results indicated that nano-Al 2 O 3 would be removed in aquatic environment.
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机译：pH，盐度和溶解的有机物可能会影响纳米粒子在水环境中的分散和聚集行为，从而改变其生态风险。讨论了时间，功率和温度对氧化铝纳米粒子（纳米Al 2 O 3）在水中超声分散的影响。 Al 2 O 3在105 W和30°C下30分钟的超声分散效果最佳。紫外分光光度计可以测定Al 2 O 3的浓度，该方法高效，准确。此外，Al 2 O 3的沉积速率与pH，盐度及其在人造海水中的浓度有关。当pH为7.31时，接近Al 2 O 3的等电点，它们聚集并沉降最快。 Al 2 O 3的沉降系数（k）分别增加了3倍和2.7倍，同时盐度及其浓度也增加了。天然海水中的沉积速率高于人工海水中的沉积速率。所有结果表明，纳米Al 2 O 3将在水生环境中被去除。
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