School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong, 264209, PR China.
School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong, 264209, PR China; School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150090, PR China.
Talanta. 2020 Nov 1;219:121348. doi: 10.1016/j.talanta.2020.121348. Epub 2020 Jul 7.
In this work, electromagnetic heating was firstly explored as sample introduction approach in portable microplasma-atomic emission spectrometer to achieve the direct, rapid analysis of soil sample. The device primarily consists of an electromagnetic heating unit, a dielectric barrier discharge (DBD) excitation source and an optical signal acquisition unit. A W-boat was used as an electromagnetic heating medium and sample carrier, and copper coil spiraled around the tube was used as magnetic induction coil. With applying a voltage on copper coil, W-boat was electromagnetically heated to vaporize analyte-containing species for sample introduction into the microplasma. The portable battery-powered device is controlled by a miniature touch screen computer with the main advantages of small size (40.5 cm (l) × 30 cm (w) × 15 cm (h).), light weight (less than 7 kg), low-power consumption (the average power consumption is 118 W). By this method, Hg, Cd and Pb in soil were simultaneously analyzed within 4 min. Under the optimal conditions, the limits of detection for Hg, Cd and Pb in soils were 8.0 μg/kg, 17.8 μg/kg and 3.5 mg/kg, respectively, meeting the requirements for environmental quality standards for soils of China. Different types of CRM soils were analyzed, demonstrating good accuracy, stability and utility of this method. This technique could be a promising and powerful tool for on-site, rapid analysis of heavy metals in soil even other solid samples. Electromagnetic heating mode provides a good alternative for solid sampling to develop portable, miniaturized atomic spectrometers for solid sample analysis.
在这项工作中，我们首次探索了电磁加热作为便携式微等离子体原子发射光谱仪中的进样方法，以实现对土壤样品的直接、快速分析。该仪器主要由电磁加热单元、介质阻挡放电（DBD）激发源和光学信号采集单元组成。W 舟被用作电磁加热介质和样品载体，铜管缠绕在管周围作为磁感应线圈。通过在铜管上施加电压，W 舟被电磁加热以蒸发含分析物的物质，从而将样品引入微等离子体中。该便携式由电池供电的仪器由微型触摸屏计算机控制，具有体积小（40.5cm(l)×30cm(w)×15cm(h)）、重量轻（小于 7kg）、功耗低（平均功耗为 118W）等主要优点。通过该方法，可在 4 分钟内同时分析土壤中的 Hg、Cd 和 Pb。在最佳条件下，土壤中 Hg、Cd 和 Pb 的检出限分别为 8.0μg/kg、17.8μg/kg 和 3.5mg/kg，满足中国土壤环境质量标准的要求。分析了不同类型的 CRM 土壤，证明了该方法具有良好的准确性、稳定性和实用性。该技术有望成为现场快速分析土壤中重金属甚至其他固体样品的有力工具。电磁加热模式为开发用于固体样品分析的便携式、小型化原子光谱仪提供了固体进样的良好替代方案。
