College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China.
Key Laboratory of Marine Chemistry and Application (Xiamen University), Fujian Province University, Xiamen 361102, China.
Int J Environ Res Public Health. 2019 Feb 12;16(3):510. doi: 10.3390/ijerph16030510.
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-Al₂O₃) ultrasonic dispersion in water were discussed. Al₂O₃ had a best ultrasonic dispersion for 30 min at 105 W and 30 °C. The concentration of Al₂O₃ could be measured by ultraviolet (UV) spectrophotometer, and the method was efficient and accurate. Furthermore, the sedimentation rate of Al₂O₃ was related to pH, salinity, and its concentration in the artificial seawater. When pH was 7.31, approaching the isoelectric point of Al₂O₃, they aggregated and settled fastest. Settlement coefficient () of Al₂O₃ 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-Al₂O₃ would be removed in aquatic environment.
纳米粒子在水环境中的分散和聚集行为可能受到 pH 值、盐度和溶解有机物的影响，这会改变其生态风险。探讨了时间、功率和温度对水中氧化铝纳米粒子（纳米-Al₂O₃）超声分散的影响。Al₂O₃在 105 W 和 30°C 下超声分散 30 分钟效果最佳。可以通过紫外（UV）分光光度计测量 Al₂O₃的浓度，该方法高效准确。此外，纳米-Al₂O₃在人工海水中的沉淀速率与 pH 值、盐度及其浓度有关。当 pH 值为 7.31 时，接近 Al₂O₃的等电点，它们聚集和沉降最快。当盐度和浓度增加时，Al₂O₃的沉降系数（）分别增加了 3 倍和 2.7 倍。纳米-Al₂O₃在天然海水中的沉降速度高于在人工海水中的沉降速度。所有结果表明，纳米-Al₂O₃将在水环境中被去除。
