Abstract
Rapid detection of Cd content in soil is beneficial to the prevention of soil heavy metal pollution. In this study, we aimed at exploring the rapid quantitative detection ability of laser- induced breakdown spectroscopy (LIBS) under the conditions of air and Ar for Cd in soil, and finding a fast and accurate method for quantitative detection of heavy metal elements in soil. Spectral intensity of Cd and system performance under air and Ar conditions were analyzed and compared. The univariate model and multivariate models of partial least-squares regression (PLSR) and least-squares support vector machine (LS-SVM) of Cd under the air and Ar conditions were built, and the LS-SVM model under the Ar condition obtained the best performance. In addition, the principle of influence of Ar on LIBS detection was investigated by analyzing the three-dimensional profile of the ablation crater. The overall results indicated that LIBS combined with LS-SVM under the Ar condition could be a useful tool for the accurate quantitative detection of Cd in soil and could provide reference for environmental monitoring.
Highlights
Soil is the most important part of the ecosystem, and plays an important role in agricultural production and human activities [1,2]
With the rapid development of industry and agriculture and the frequent use of agricultural chemicals, heavy metals are deposited into the soil through the atmosphere, industrial and municipal domestic sewage, industrial and mining industry solid waste, and agricultural chemicals, making the soil heavy metal pollution more and more serious
The results showed that Ar had a great influence on the signal of Se I 196.090 nm, of which the spectral intensity was increased by about three times and the value of relative standard deviation (RSD) decreased by 0.01
Summary
Soil is the most important part of the ecosystem, and plays an important role in agricultural production and human activities [1,2]. The rational utilization of soil is beneficial to the healthy and stable development of modern society [3]. Cadmium (Cd) pollution is one of the most serious soil heavy metal pollutions in China. Many soil Cd content over standard events have been reported [4,5], which have attracted the public’s attention. Cd is one of the most toxic heavy metals, and it is listed as the sixth most hazardous substances by the Agency for Toxic Substances and Disease Registry (ATSDR) and the first carcinogen by the International Agency for Research on Cancer (IARC) [6,7]. It is necessary to quantitatively detect the Cd content in soil to monitor environmental quality and ensure food safety
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
