Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-8600, Duebendorf, Switzerland.
Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-8600, Duebendorf, Switzerland.
Environ Pollut. 2015 Nov;206:582-7. doi: 10.1016/j.envpol.2015.08.017. Epub 2015 Aug 24.
Dissolution of silver nanoparticles (AgNP with carbonate or citrate coating, total Ag 1-5 μM) was examined in the presence of the ligands cysteine, chloride and fulvic acids and of the oxidant hydrogen peroxide (H2O2) at low concentrations at pH 7.5. Dissolved Ag was separated from AgNP by ultrafiltration. Cysteine in the concentration range 0.2-5 μM resulted in an initial increase of dissolved Ag within few hours. Chloride (up to 0.1 mM) and fulvic acids (up to 15 mg L(-1)) had little effect on the dissolution of AgNP within hours to days. In contrast, very rapid dissolution within 1-2 h of both carbonate and citrate coated AgNP was observed in the presence of H2O2 in the concentration range 0.1-10 μM, under dark or light conditions. The high efficiency of H2O2 in dissolving AgNP is likely to be of importance in toxic effects of AgNP to algae, as H2O2 is produced and released into solution by algae.
在 pH 值为 7.5 时，研究了在低浓度下配体半胱氨酸、氯离子和腐殖酸以及氧化剂过氧化氢 (H2O2) 的存在下，带有碳酸根或柠檬酸盐涂层的银纳米颗粒 (AgNP，总 Ag 浓度为 1-5 μM) 的溶解情况。通过超滤将溶解的 Ag 与 AgNP 分离。在 0.2-5 μM 的浓度范围内，半胱氨酸会导致溶解的 Ag 在数小时内最初增加。氯离子（高达 0.1 mM）和腐殖酸（高达 15 mg L(-1)）在数小时至数天内对 AgNP 的溶解影响不大。相比之下，在 0.1-10 μM 的 H2O2 浓度范围内，在黑暗或光照条件下，碳酸根和柠檬酸盐涂层的 AgNP 会非常迅速地在 1-2 小时内溶解。H2O2 高效溶解 AgNP 可能对藻类中 AgNP 的毒性效应很重要，因为藻类会产生并将 H2O2 释放到溶液中。
