水生生物学报Issue(2)：375-381,7.DOI:10.7541/2015.49
纳米银在水-沉积物中的迁移机制研究
THE TRANSPORTATION OF SILVER NANOPARTICLES BETWEEN WATER AND SEDIMENTS
摘要
Abstract
Silver nanoparticles (AgNPs), one of the most widely used and fastest developed nanomaterials, have gra-dually aroused people’s concern. But the mechanisms of its transportation and transformation across water-sediments remain unknown. To reveal the water environmental behaviors of AgNPs, indoor simulation experiments using the water and sediments sampled from the East Lake of Wuhan were employed for AgNPs and Poly (vinylpyrrolidone)-coated silver nanoparticles (PVP-AgNPs) test, and silver nitrate (AgNO3) was used as a reference. The sedimentation curves, distribution patterns and different forms of silver in the sediments and the release curves were studied within 60 days. The results indicated that most of silver sank into the sediments after they were added into water for 120 hours. Spe-cially, the Ag concentration in the overlying water dropped from the same initial concentration (75 mg/L) to 0.086 mg/L, 0.957 mg/L and 2.770 mg/L for AgNO3, AgNPs and PVP-AgNPs, respectively. After 60 days, all of the Ag species en-tered the sediments and stayed in the 5 cm top layers. The silver contents of AgNO3 system gradually decreased with increasing depth, while those of the AgNPs and PVP-AgNPs first increased, and then reduced gradually when reaching 2 cm depth. Furthermore, although 24.6%silver existed in 2—3 cm layer for PVP-AgNPs system, only 2.6%for AgNPs system were observed in the same layer. These distribution patterns indicated that the transport ability of nano-silver was stronger than that of AgNO3, and PVP-AgNPs was stronger than that of uncoated. Speciation analysis showed that silver was mainly combined by sulfides and organic matters in the sediments. The release experiment results showed that the release of nano-silver aggregated in the sediments was much difficult than that of AgNO3, suggesting that the adverse environmental effects of nano-silver would greatly depressed once they entered the real water environment. The above results provide scientific basis to evaluate the ecological security of nano-silver.关键词
纳米银/水-沉积物/迁移Key words
Silver nanoparticles/Water-sediments/Transportation分类
资源环境引用本文复制引用
高素娟,方涛,王广召,吕锦刚,鲍少攀,唐巍..纳米银在水-沉积物中的迁移机制研究[J].水生生物学报,2015,(2):375-381,7.基金项目
国家“水体污染控制与治理”科技重大专项(2012ZX07103-001) （2012ZX07103-001）
国家自然科学基金(21477159)资助 （21477159）
