[Effects of temperature and pH on the distribution of aluminum species in drinking water].
The effects of aluminum on water distribution system and human health are mainly attributable to their presence in drinking water. Laboratory experiments were performed to investigate the influence of temperature and pH on the distribution of aluminum species applying alum synthetic water. Aluminum species studied in the experiments included monomeric aluminum, soluble aluminum, suspended aluminum, and polymeric aluminum, which were determined by fluorescence spectrophotometry method. Results indicated that suspended aluminum was the major species at pH 6.5, occupied about 62.2% in the total aluminum mass concentration. While at pH above 7.0, monomeric aluminum was the major species; and varied little as reaction time increased. Polymeric aluminum mass concentration was low at studied water quality condition and also varied little as reaction time increased. The influence of temperature on aluminum species distribution was similar to solution pH; and both could be explained by pOH. Aluminum species in drinking water could be controlled by adjusting the pOH value, which provided theoretical guidance for the operation of the water distribution system and aluminum toxicity control.
Wang
Wen-dong
WD
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. wwd04@mails.tsinghua.edu.cn
Yang
Hong-wei
HW
Jiang
Jing
J
Zhu
Wan-peng
WP
Jiang
Zhan-peng
ZP
D000535:Aluminum / Q000032:analysis* / Q000737:chemistry*; D017607:Aluminum Compounds / Q000032:analysis; D002681:China; D006863:Hydrogen-Ion Concentration; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000032:analysis*
D017607:Aluminum Compounds; D014874:Water Pollutants, Chemical; D000535:Aluminum