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利用一台小型Nd:YAG调Q激光器,在常压大气环境下诱导激发标准岩石等离子体,通过分析微光谱仪收集记录的等离子体发射光谱来定量分析样品中部分元素含量。选择Si元素作为内标元素,根据分析线与内标线的相对强度比,分别对岩石中的Mg元素和Ca元素建立不同的定标曲线。在实验条件相同且无光谱干扰的条件下,元素含量比的对数值与光谱线总强度比的对数值之间有很好的线性关系,其定量分析曲线的拟合度R最小值为0.996,测得相对标准偏差(RSD)的最大值为6.5%。研究结果表明,利用强度归一化法定量分析岩石主要元素含量在一定程度上可以提高测量准确度。
A small Nd: YAG Q-switched Q laser was used to induce standard rock plasma excitation at atmospheric pressure. Quantitative analysis of some elements in the sample was performed by analyzing the recorded plasma emission spectra by using a micro-spectrometer. Select Si element as the internal standard element, according to the relative intensity ratio of the analytical line and the internal standard line, respectively, to establish a different calibration curve of the Mg element and Ca element in the rock. Under the same experimental conditions and without spectral interference, there is a good linear relationship between the logarithm of the elemental content ratio and the logarithm of the total intensity ratio of the spectral line, and the minimum value of the fitting R of the quantitative analysis curve is 0.996, The maximum relative standard deviation (RSD) measured was 6.5%. The results show that the use of intensity normalization method to quantitatively analyze the main elements of rock can improve the measurement accuracy to a certain extent.