CSIRO Land and Water, Advanced Materials Transformational Capability Platform-Nanosafety, Biogeochemistry Program, PMB 2 Glen Osmond, SA 5064, Australia.
CSIRO Land and Water, Advanced Materials Transformational Capability Platform-Nanosafety, Biogeochemistry Program, PMB 2 Glen Osmond, SA 5064, Australia.
Environ Pollut. 2014 Oct;193:102-110. doi: 10.1016/j.envpol.2014.06.008. Epub 2014 Jul 9.
Manufactured nanoparticles (NPs) present in consumer products could enter soils through re-use of biosolids. Among these NPs are those based on silver (Ag), which are found sulphidised (e.g. silver sulphide, Ag2S) in biosolids. Herein, our aim was to examine the release of retained Ag(0) and Ag2S NPs in soils and biosolids as facilitated by environmentally and agriculturally relevant ligands. Under natural soil conditions, exemplified by potassium nitrate and humic acid experiments, release of Ag retained in soil was limited. The highest total Ag release was facilitated by ligands that simulated root exudates (citrate) or fertilisers (thiosulphate). Released Ag was predominantly present in the colloidal phase (>3 kDa-< 0.45 μm); intact NPs only identified in Ag2S-NP extracts. For biosolids containing nanoparticulate-Ag-S, release was also enhanced by thiosulphate, though mostly as colloidal-Ag - not intact NPs. These results suggest that exposure to NPs as a result of its release from soils or biosolids will be low.
消费产品中存在的人造纳米颗粒（NPs）可能通过再利用生物固体进入土壤。这些 NPs 包括基于银的 NPs，它们在生物固体中被硫化（例如银硫化物，Ag2S）。在此，我们的目的是研究在环境和农业相关配体的促进下，土壤和生物固体中保留的 Ag(0)和 Ag2S NPs 的释放。在以硝酸钾和腐殖酸实验为代表的自然土壤条件下，土壤中保留的 Ag 的释放受到限制。模拟根分泌物（柠檬酸盐）或肥料（硫代硫酸盐）的配体促进了最大的总 Ag 释放。释放的 Ag 主要存在于胶体相中（>3 kDa-<0.45 μm）；仅在 Ag2S-NP 提取物中鉴定到完整的 NPs。对于含有纳米颗粒-Ag-S 的生物固体，硫代硫酸盐也促进了释放，但主要是胶体-Ag-而不是完整的 NPs。这些结果表明，由于从土壤或生物固体中释放出来的 NPs 的暴露，其暴露水平将较低。
