In order to enhance the spectral characteristics of the laser-induced breakdown spectroscopy(LIBS),the spectral sig-nals of soil samples with different concentrations of KCl and KI additives were analyzed.The optimal laser energy,the lens to sample distance(LTSD)and the delay time were determined.Under the optimum experimental conditions,the spectral intensity,signal-to-noise ratio(SNR)and plasma characteristics of Cd I288.08 nm and Al I 394.40 nm in soil samples with 0％,5％,10％,15％,20％,25％and 30％KCl and KI additives were analyzed.The experimental results show that the spectral intensities of Cd and Al in soil samples with 15％KCl are 1.33 times and 1.61 times of that of the original sample,while those with 15％KI are 1.84 times and 1.81 times.The SNR,plasma temperature and elec-tron density are improved.This provides an experimental reference for improving the accuracy of LIBS in soil detec-tion.

LI Honglian;ZHANG Shizhao;ZHANG Chenxing;WANG Fan;FANG Lide;LI Xiaoting

School of Quality and Technical Supervision,Hebei University,Baoding 071002,China;National&Local Joint Engineering Research Center of Metrology Instrument and System,Baoding 071002,China;Hebei Key Laboratory of Energy Metering and Safety Testing Technology,Hebei University,Baoding 071002,China

光电子快报（英文版）

[1]LI Honglian;ZHANG Shizhao;ZHANG Chenxing;WANG Fan;FANG Lide;LI Xiaoting-.Effects of KCI and KI additives on soil breakdown spec-troscopy characteristics)[J].光电子快报（英文版）,2022(02):109-114

LTSD,I288

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