College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, PR China; Center for Environment and Water Resources, College of Chemistry and Chemical Engineering, Central South University, No. 932 Lushan Nan Road, Yuelu District, Changsha, 410083, PR China; Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Central South University, Changsha, 410083, Hunan, PR China.
College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, PR China; International Joint Laboratory of Hunan Agricultural Typical Pollution Restoration and Water Resources Safety Utilization, Hunan Agricultural University, Changsha, 410128, PR China.
Anal Chim Acta. 2020 May 8;1110:72-81. doi: 10.1016/j.aca.2020.03.005. Epub 2020 Mar 7.
Ever-growing application of engineering nanoparticles in many sectors of the society requires efficient methods to extract them from soil and sediment, for the sake of environmental protection. In this study, we develop a new method which uses sodium pyrophosphate solution (TSPP, NaPO) as extratant to extract gold nanoparticle (AuNPs) from soil and sediment under optimized parameters through vortexing, water bath oscillation, ultrasonic bath and precipitation. SP-ICP-MS was used for the detection of number concentration, mass concentration and size distribution of AuNPs in soil. UV irradiation was innovatively used to directly degrade soil organic matter to improve the recovery of AuNPs due to their low recovery rate in rich organic soils. It could be found that the mass fraction recovery increased from 36% (without UV digestion) to 83% (with 48h UV digestion). The extraction method is versatile for different coating layers and wide-ranging particle sizes in real soil and sediment. Therefore, the rapid and efficient characterization and quantification of AuNPs in soil and sediment are achieved, and the researches on the extraction method of AuNPs and their behavior and toxicity assessment in soil environment can be enriched.
随着工程纳米粒子在社会许多领域的应用不断增加，为了保护环境，需要有效的方法从土壤和沉积物中提取它们。在这项研究中，我们开发了一种新方法，该方法使用焦磷酸钠溶液（TSPP，NaPO）作为萃取剂，通过涡旋、水浴振荡、超声浴和沉淀，在优化的参数下从土壤和沉积物中提取金纳米粒子（AuNPs）。SP-ICP-MS 用于检测土壤中 AuNPs 的数浓度、质量浓度和粒径分布。创新性地使用紫外线照射直接降解土壤有机质，以提高 AuNPs 的回收率，因为它们在富含有机质的土壤中的回收率较低。可以发现，质量分数回收率从无 UV 消解的 36%增加到 48h UV 消解的 83%。该提取方法适用于不同的涂层和实际土壤和沉积物中的各种粒径。因此，可以实现土壤和沉积物中 AuNPs 的快速、高效表征和定量，并丰富 AuNPs 在土壤环境中的提取方法及其行为和毒性评估的研究。
