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, Na4P2O7) 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.

中文翻译：

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土壤和沉积物中金纳米颗粒的定量检测

出于环境保护的考虑，工程纳米粒子在社会许多领域的不断增长的应用需要有效的方法从土壤和沉积物中提取它们。在本研究中，我们开发了一种新方法，以焦磷酸钠溶液（TSPP、Na4P2O7）为萃取剂，通过涡旋、水浴振荡、超声波浴和沉淀在优化参数下从土壤和沉积物中提取金纳米颗粒（AuNPs）。SP-ICP-MS用于检测土壤中AuNPs的数量浓度、质量浓度和粒径分布。由于 AuNPs 在富含有机质土壤中的回收率低，因此创新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。可以发现，质量分数回收率从 36%（没有紫外线消解）增加到 83%（有 48 小时紫外线消解）。该提取方法适用于实际土壤和沉积物中不同的涂层和广泛的粒径。因此，实现了土壤和沉积物中AuNPs的快速高效表征和定量，丰富了AuNPs的提取方法及其在土壤环境中的行为和毒性评估的研究。