中国激光, 2014, 41 (7): 0715002, 网络出版: 2014-06-13   

激光诱导击穿光谱结合标准加入法定量检测土壤中Cr

Quantitative Measurement of Cr in Soil Using Laser Induced Breakdown Spectroscopy Combined with Standard Addition Method
作者单位
中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031
摘要
利用激光诱导击穿光谱(LIBS)结合标准加入法对土壤中的Cr进行定量检测。以Cr 425.435 nm谱线为特征谱线,以Fe为内标元素,建立了土壤中Cr的定标曲线,确定在Cr质量分数低于250×10-6时,其特征谱线强度与其质量分数成线性关系,并由此求出土壤中Cr检测限为9.69×10-6,确定了标准加入法的检测范围。研究了5个外推点和单外推点的标准加入法,五点标准加入法对土壤中Cr的检测结果相对误差小于7%,单点标准加入法检测结果相对误差小于10%。基于单点标准加入法对同一土样进行5次检测,所得Cr质量分数的相对标准偏差(RSD)为4.66%,稳定性较好。实验结果证明LIBS结合标准加入法可以对土壤中的Cr进行较好的定量检测。
Abstract
Laser induced breakdown spectroscopy (LIBS) combined with the standard addition method is used to detect the Cr concentration in soil. With the Cr 425.435 nm line as the characteristic line and Fe as the internal standard element, the Cr calibration curve is established. Based on the fact that when the Cr mass fraction is below 250×10-6, the spectral intensity of characteristic line has a linear relationship with its mass fraction, the limit of detection is 9.69×10-6 and the detection range of the standard addition method is obtained. The standard addition methods with one and five extrapolated points are studied. For five-point standard addition method, the relative error of test results of Cr in soil is less than 7%. For one-point standard addition method, the relative error is less than 10%. Detect one soil sample by one-point standard addition method for five times, the relative standard deviation (RSD) of the test results is 4.66%, which is relatively stable. Experimental results show that LIBS combined with standard addition method can perform well in quantitative detection of Cr in soil.

孟德硕, 赵南京, 刘文清, 方丽, 马明俊, 王寅, 余洋, 胡丽, 张大海, 王煜, 刘建国. 激光诱导击穿光谱结合标准加入法定量检测土壤中Cr[J]. 中国激光, 2014, 41(7): 0715002. Meng Deshuo, Zhao Nanjing, Liu Wenqing, Fang Li, Ma Mingjun, Wang Yin, Yu Yang, Hu Li, Zhang Dahai, Wang Yu, Liu Jianguo. Quantitative Measurement of Cr in Soil Using Laser Induced Breakdown Spectroscopy Combined with Standard Addition Method[J]. Chinese Journal of Lasers, 2014, 41(7): 0715002.

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