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首页> 外文期刊>International journal of environmental analytical chemistry >Separation and quantification of quantum dots and dissolved metal cations by size exclusion chromatography-ICP-MS
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Separation and quantification of quantum dots and dissolved metal cations by size exclusion chromatography-ICP-MS

机译：尺寸排阻色谱-ICP-MS分离和定量量子点和溶解的金属阳离子

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摘要

The prevalence of engineered metallic nanoparticles within electronic products has evoked a need to assess their occurrence and fate within environmental systems upon potential release of these nanoparticles. Quantum dots (QDs) are mixed-metal nanocrystals with the smallest of particle sizes (2-10nm) that readily leach heavy metal cations in water, potentially creating a co-occurrence of nanoparticulate and dissolved metal pollutants. In this report, we develop a size exclusion chromatography-inductively coupled plasma-mass spectrometry method (SEC-ICP-MS) for the rapid separation and quantification of similar to 5-nm-sized CdSe/ZnS QDs and dissolved Cd2+ and Zn2+ cations in water. The SEC-ICP-MS method provided a wide chromatographic separation of CdSe/ZnS QDs and dissolved Cd2+ and Zn2+ cations only when using the smallest SEC column pore size available and an eluent composition that prevented loss of metals to column polymer surfaces by using a surfactant to ensure elution of QDs (ammonium lauryl sulfate) and a complexing ligand to ensure elution of metal cations (ethylenediaminetetraacetate). Detection limits were between 0.2 and 2 mu gL(-1) for Cd2+ and Zn2+ among dissolved cation and QD phases, and ranges of linearity covered two to three orders of magnitude. Gold nanoparticles of sizes 5, 10, 20 and 50nm were also effectively separated from dissolved Au3+ cations, illustrating the method applicability to a wide range of nanoparticle sizes and compositions. QD and dissolved metal concentrations measured by SEC-ICP-MS were comparable to those measured using the more conventional method of centrifuge ultrafiltration on split samples for dissolved and total metals. The applicability of the SEC-ICP-MS method to environmental systems was verified by measuring QDs and dissolved metals added to samples of natural waters. The method was also applied to monitoring CdSe/ZnS dissolution kinetics in an urban river water. The SEC-ICP-MS developed here may offer improved automation for characterising heterogeneous suspensions containing >1 mu gL(-1) heavy metals.
机译：电子产品中工程化金属纳米粒子的盛行引发了评估这些纳米粒子潜在释放后在环境系统中它们的发生和命运的需求。量子点（QD）是具有最小粒径（2-10nm）的混合金属纳米晶体，可轻易浸出水中的重金属阳离子，并可能同时产生纳米颗粒和溶解的金属污染物。在本报告中，我们开发了尺寸排阻色谱-电感耦合等离子体质谱法（SEC-ICP-MS），用于快速分离和定量与5nm尺寸的CdSe / ZnS QDs和溶解的Cd2 +和Zn2 +阳离子相似的水。仅当使用可用的最小SEC色谱柱孔径时，SEC-ICP-MS方法可对CdSe / ZnS QD和溶解的Cd2 +和Zn2 +阳离子进行宽色谱分离，并且洗脱液成分可通过使用表面活性剂防止金属损失到色谱柱聚合物表面以确保QD（十二烷基硫酸铵）和络合配体的洗脱，以确保金属阳离子（乙二胺四乙酸盐）的洗脱。溶解的阳离子和QD相中Cd2 +和Zn2 +的检出限在0.2和2μgL（-1）之间，线性范围覆盖2到3个数量级。还可以将5、10、20和50nm大小的金纳米颗粒与溶解的Au3 +阳离子有效分离，说明该方法适用于各种纳米尺寸和组成。通过SEC-ICP-MS测量的QD和溶解金属浓度与使用更常规的离心超滤方法对分离的样品中的溶解金属和总金属所测量的QD和溶解金属浓度相当。 SEC-ICP-MS方法对环境系统的适用性通过测量添加到天然水样中的QD和溶解的金属来验证。该方法还用于监测城市河流水中CdSe / ZnS的溶解动力学。此处开发的SEC-ICP-MS可能会提供改进的自动化功能，用于表征包含> 1μgL（-1）重金属的异质悬浮液。

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