产物用去离子水洗涤，磁体分离后分散在7ml0.12M四乙基氢氧化铵水溶液中，从而得到稳定均匀的Fe3O4悬浮液。
The product was washed with deionized water using a magnet and dispersed in 7 ml 0.12 M TEAOH.
第四步(最终水洗)将酸性溶液冲洗掉，并不断冲洗系统直到出来的水和进去的水的性质相同时。
The Fourth Step (Final Water rinse) - the acidic solution is flushed and the system is rinsed until the quality of the effluent is equal to that of the influent.
结果惊人：用水洗涤的方法除去了98%以上的细菌，而用酒精基溶液的几乎没有除去！
The results were striking: the protocols that involved washing with water eliminated more than 98% of the bacteria, while washing with an alcohol-based solution eliminated almost none!
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