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首页> 外文期刊>Environmental toxicology and chemistry >DETECTING NANOPARTICULATE SILVER USING SINGLE-PARTICLE INDUCTIVELY COUPLED PLASMA-MASS SPECTROMETRY
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DETECTING NANOPARTICULATE SILVER USING SINGLE-PARTICLE INDUCTIVELY COUPLED PLASMA-MASS SPECTROMETRY

机译：单粒子电感耦合等离子体质谱法检测纳米银

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The environmental prevalence of engineered nanomaterials, particularly nanoparticulate silver (AgNP), is expected to increase substantially. The ubiquitous use of commercial products containing AgNP may result in their release to the environment, and the potential for ecological effects is unknown. Detecting engineered nanomaterials is one of the greatest challenges in quantifying their risks. Thus, it is imperative to develop techniques capable of measuring and characterizing exposures, while dealing with the innate difficulties of nanomaterial detection in environmental samples, such as low-engineered nanomaterial concentrations, aggregation, and complex matrices. Here the authors demonstrate the use of inductively coupled plasma-mass spectrometry, operated in a single-particle counting mode (SP-ICP-MS), to detect and quantify AgNP. In the present study, two AgNP products were measured by SP-ICP-MS, including one of precisely manufactured size and shape, as well as a commercial AgNP-containing health food product. Serial dilutions, filtration, and acidification were applied to confirm that the method detected particles. Differentiation of dissolved and paniculate silver (Ag) is a feature of the technique. Analysis of two wastewater samples demonstrated the applicability of SP-ICP-MS at nanograms per liter Ag concentrations. In this pilot study, AgNP was found at 100 to 200ng/L in the presence of 50 to 500ng/L dissolved Ag. The method provides the analytical capability to monitor Ag and other metal and metal oxide nanoparticles in fate, transport, stability, and toxicity studies using a commonly available laboratory instrument. Rapid throughput and element specificity are additional benefits of SP-ICP-MS as a measurement tool for metal and metal oxide engineered nanoparticles.
机译：工程纳米材料，特别是纳米颗粒银（AgNP）的环境普及率预计将大大提高。含AgNP的商业产品的普遍使用可能导致其释放到环境中，其生态影响的潜力尚不清楚。检测工程纳米材料是量化其风险的最大挑战之一。因此，当务之急是开发能够测量和表征暴露的技术，同时解决环境样品中纳米材料检测的先天困难，例如工程化的纳米材料浓度低，聚集和复杂的基质。在这里，作者展示了以单颗粒计数模式（SP-ICP-MS）操作的电感耦合等离子体质谱法检测和定量AgNP的方法。在本研究中，通过SP-ICP-MS测量了两种AgNP产品，包括一种精确制造的尺寸和形状，以及一种包含AgNP的商业保健食品。进行系列稀释，过滤和酸化以确认该方法检测到颗粒。溶解的和颗粒状的银（Ag）的区别是该技术的特征。对两个废水样品的分析表明，SP-ICP-MS在纳克/升银浓度下的适用性。在该初步研究中，在存在50至500ng / L溶解的Ag的情况下，发现AgNP的浓度为100至200ng / L。该方法提供了分析能力，可使用常用的实验室仪器监测Ag，其他金属和金属氧化物纳米颗粒的命运，迁移，稳定性和毒性研究。快速的通量和元素特异性是SP-ICP-MS作为金属和金属氧化物工程纳米粒子的测量工具的其他优势。

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