Detection and quantification of Pb and Cr in oysters using laser-induced breakdown spectroscopy  

作　　者：闫清霞 田野 李颖 林洪 贾自文 卢渊 俞进 孙琛 白雪石 Vincent DETALLE Qingxia YAN;Ye TIAN;Ying LI;Hong LIN;Ziwen JIA;Yuan LU;Jin YU;Chen SUN;Xueshi BAI;Vincent DETALLE(College of Physics and Optoelectronic Engineering,Ocean University of China,Qingdao 266100,People’s Republic of China;Food Safety Laboratory,Ocean University of China,Qingdao 266003,People’s Republic of China;School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,People’s Republic of China;Centre de Recherche et de Restauration des Musées de France(C2RMF),Paris 75001,France;SATIE,CY Cergy-Paris Université,ENS Paris-Saclay,CNRS UMR 8029,Neuville sur Oise 95031,France)

机构地区：[1]College of Physics and Optoelectronic Engineering,Ocean University of China,Qingdao 266100,People’s Republic of China [2]Food Safety Laboratory,Ocean University of China,Qingdao 266003,People’s Republic of China [3]School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,People’s Republic of China [4]Centre de Recherche et de Restauration des Musées de France(C2RMF),Paris 75001,France [5]SATIE,CY Cergy-Paris Université,ENS Paris-Saclay,CNRS UMR 8029,Neuville sur Oise 95031,France

出　　处：《Plasma Science and Technology》2023年第4期195-203,共9页等离子体科学和技术（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2019YFD0901701);National Natural Science Foundation of China(Nos.12174359and 61975190);Provincial Key Research and Development Program of Shandong,China(No.2019GHZ010)。

摘　　要：The quantitative determination of heavy metals in aquatic products is of great importance for food security issues.Laser-induced breakdown spectroscopy(LIBS)has been used in a variety of foodstuff analysis,but is still limited by its low sensitivity when targeting trace heavy metals.In this work,we compare three sample enrichment methods,namely drying,carbonization,and ashing,for increasing detection sensitivity by LIBS analysis for Pb and Cr in oyster samples.The results demonstrate that carbonization can remove a significant amount of the contributions of organic elements C,H,N and O;meanwhile,the signals of the metallic elements such as Cu,Pb,Sr,Ca,Cr and Mg are enhanced by3–6 times after carbonization,and further enhanced by 5–9 times after ashing.Such enhancement is not only due to the more concentrated metallic elements in the sample compared to the dried ones,but also the unifying of the matter in carbonized and ashed samples from which higher plasma temperature and electron density are observed.This condition favors the detection of trace elements.According to the calibration curves with univariate and multivariate analysis,the ashing method is considered to be the best choice.The limits of detection of the ashing method are 0.52 mg kg-1 for Pb and0.08 mg kg-1 for Cr,which can detect the presence of heavy metals in the oysters exceeding the maximum limits of Pb and Cr required by the Chinese national standard.This method provides a promising application for the heavy metal contamination monitoring in the aquatic product industry.

关 键 词：laser-induced breakdown spectroscopy(LIBS) heavy metal detection signal enhancement sample preparation method quantification OYSTERS 

分 类 号：O657.38[理学—分析化学] TS254.7[理学—化学]