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利用激光诱导击穿掺杂Cr、Cu元素的自制土壤样品,对元素特征谱线的信背比随含量的变化情况进行对比分析,并选择常用谱线Cr(I)425.435 nm,427.481 nm、Cu(I)324.754 nm,327.396 nm,利用相应Fe谱线作为内标作出校准曲线,计算检出限,研究谱线跃迁能级的原子组态、角动量和跃迁几率等微观特性对校准曲线和检出限的影响。研究结果表明,信背比高的谱线得到的检出限相对较低,对元素检测更为敏感;谱线的信背比与谱线对应的跃迁几率无关。跃迁原子组态相同的谱线的信背比随含量变化显示出相同的变化趋势,其中角动量相对较大的谱线Cr(I)425.435 nm(4-3)和Cu(I)324.754 nm(3/2-1/2)激发状况较好,得到的校准曲线的线性拟合值也相对较高,检出限相比于角动量小的谱线Cr(I)427.481 nm(3-3)和Cu(I)327.396 nm(1/2-1/2)分别降低了11%和42%,对元素检测的灵敏度更高,更适合作为元素检测的特征谱线。
The laser-induced breakdown of self-made soil samples doped with Cr and Cu was used to compare the signal-to-background ratio of elemental characteristic lines with the change of content. The common spectral lines were Cr (I) 425.435 nm, 427.481 nm, Cu (I) 324.754 nm, 327.396 nm, using the corresponding Fe line as the internal standard to make the calibration curve, calculating the detection limit, investigating the spectral properties of the transition state energy level, angular momentum and transition probability and other micro-characteristics of the calibration curve and test The impact of the limit. The results show that the detection limit of the signal-to-background ratio line is relatively low, which is more sensitive to the element detection. The signal-to-background ratio of the line has nothing to do with the corresponding transition probability of the line. The signal-to-background ratio of the same-line transition atomic configuration shows the same trend as the change of the content. Among them, the relatively large angular momentum spectra of Cr (I) 425.435 nm (4-3) and Cu (I) 324.754 nm 3 / 2-1 / 2), and the linearity of the obtained calibration curve was relatively high. The detection limit was 427.481 nm (3-3) lower than the angular momentum of Cr (I) And Cu (I) 327.396 nm (1 / 2-1 / 2) decreased by 11% and 42% respectively. It is more sensitive to elemental detection and more suitable for the characteristic spectrum of elemental detection.