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Abstract：
Single-particle inductively coupled plasma mass spectrometry (spICP-MS) has been used to characterize metallic nanoparticles (NPs) assuming that all NPs are spherical and composed of pure element. However, environmental NPs generally do not meet these criteria, suggesting that spICP-MS may underestimate their true sizes. This study employed a system hyphenating the atomizer (ATM), differential mobility analyzer (DMA), and spICP-MS to characterize metallic NPs in tap water. Its performance was validated by using reference Au nanoparticles (AuNPs) and Ag-shelled AuNPs. The hyphenated system can determine the actual size and metal composition of both NPs with additional heating after ATM, while stand-alone spICP-MS misidentified the Ag-shelled AuNPs as smaller individual AgNPs and AuNPs. Dissolved metal ions could introduce artifact NPs after heating but could be eliminated by centrifugation. The hyphenated system was applied to characterize Fe-containing and Pb-containing NPs resulting from the corrosion of plumbing materials in tap water. The mode sizes of Fe-containing and Pb-containing NPs were determined to be 110 and 100 nm and the particle number concentrations were determined to be 4.99 × 107 and 1.40 × 106 #/mL, respectively. Cautions should be paid to potential changes in particle size induced by heating for metallic NPs with a low melting point or a high organic content.
摘要：
单粒子电感耦合等离子体质谱法（spICP-MS）已用于表征金属纳米粒子（NP），假设所有NP均为球形并由纯元素组成。然而,环境NPs通常不符合这些标准，这表明spICP-MS可能低估了它们的真实大小。这项研究采用了雾化器(ATM)的系统，差分迁移率分析仪(DMA),和spICP-MS表征自来水中的金属NPs。通过使用参比Au纳米粒子(AuNP)和Ag壳AuNP验证了其性能。该连字符系统可以确定两个NP的实际尺寸和金属组成，并在ATM后进行额外加热，而独立的spICP-MS将Ag壳的AuNP错误地识别为较小的单个AgNP和AuNP。溶解的金属离子可以在加热后引入伪影NP，但可以通过离心消除。该连字符系统用于表征由于自来水中管道材料的腐蚀而产生的含Fe和含Pb的NP。含铁和含铅的NP的模式尺寸确定为110和100nm，颗粒数浓度确定为4.99×107和1.40×106#/mL，分别。对于低熔点或高有机物含量的金属NP，应注意加热引起的粒径潜在变化。
