Fu Xinglan, Li Guanglin, Tian Hongwu, Dong Daming
College of Engineering & Technology, Southwest University 216 Tiansheng Road, Beibei Chongqing 400716 PR China.
Beijing Key Laboratory of Digital Plant, National Engineering Research Center for Information Technology in Agriculture, Beijing Academy of Agriculture and Forestry Sciences Beijing 100097 China
RSC Adv. 2018 Nov 27;8(69):39635-39640. doi: 10.1039/c8ra07799a. eCollection 2018 Nov 23.
The determination of heavy metals in soils is of great significance for the monitoring and control of environmental pollution. However, it is hard to realize fast and measurements. Laser-induced breakdown spectroscopy (LIBS) is an effective method for element detection in soils, but its detection limit cannot meet the requirements of the control of soil pollution. In addition, it usually suffers splash problems and needs complex pretreatment processes before measurement. In this study, we developed a new method for the determination of cadmium in soils using LIBS. We improved the sensitivity of common LIBS, while avoiding splash problems and without complex pretreatment processes. The LIBS signal is enhanced in two ways. Firstly, the heavy metals were enriched by the cation exchange resins. And then, the LIBS signal levels were further enhanced by a sample container with spatial confinement. During this process, the soil only needs to be treated with water to achieve slurry status, rather than any complex pretreatments. We demonstrated that the detection limit for cadmium in soils is 0.132 mg kg using this method.
土壤中重金属的测定对于环境污染的监测与控制具有重要意义。然而，实现快速准确的测量较为困难。激光诱导击穿光谱法（LIBS）是土壤中元素检测的有效方法，但其检测限无法满足土壤污染控制的要求。此外，它通常存在飞溅问题，且测量前需要复杂的预处理过程。在本研究中，我们开发了一种利用LIBS测定土壤中镉的新方法。我们提高了普通LIBS的灵敏度，同时避免了飞溅问题且无需复杂的预处理过程。LIBS信号通过两种方式得到增强。首先，通过阳离子交换树脂富集重金属。然后，通过具有空间限制的样品容器进一步提高LIBS信号水平。在此过程中，土壤只需用水处理至泥浆状态，而无需任何复杂的预处理。我们证明，使用该方法土壤中镉的检测限为0.132 mg/kg。
