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将激光诱导击穿光谱技术与双谱线定量分析方法结合对土壤中镁元素进行分析,选取镁(Mg)元素的383.8nm原子谱线和823.5nm离子谱线作为分析线。对21个不同浓度的土壤样品,根据原子、离子谱线强度与镁(Mg)元素浓度值分别建立定标曲线,相关系数分别为0.911和0.888。针对分析结果采用双谱线定量分析方法对21个土壤样品建立定标曲线,相关系数提高到0.950,检测限为0.008%。根据定量模型对9个验证样品的浓度进行预测,相对误差为0.41%~5.32%,平均误差为1.84%。
The combination of laser-induced breakdown spectroscopy and double-line quantitative analysis was used to analyze the contents of magnesium in the soil. The 383.8 nm and 823.5 nm ion spectra of magnesium (Mg) were selected as the analytical lines. The calibration curves of 21 soil samples with different concentrations were established respectively according to the intensity of atomic and ionic lines and the concentration of magnesium (Mg). The correlation coefficients were 0.911 and 0.888 respectively. According to the analysis results, the calibration curves of 21 soil samples were established by bispectral quantitative analysis method, the correlation coefficient increased to 0.950, and the detection limit was 0.008%. According to the quantitative model, the concentrations of nine validated samples were predicted, with relative errors of 0.41% ~ 5.32% and mean errors of 1.84%.