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

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

文摘	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 425.435nm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。
其他语种文摘	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.
来源	中国激光 ,2014,41(7):0715002-1-0715002-6 【核心库】
关键词	光谱学 ; 激光诱导击穿光谱 ; 标准加入法 ; 土壤 ; 铬 ; 定量检测
地址	中国科学院安徽光学精密机械研究所, 中国科学院环境光学与技术重点实验室, 安徽, 合肥, 230031
语种	中文
文献类型	研究性论文
ISSN	0258-7025
学科	化学
基金	国家自然科学基金 ; 国家863计划 ; 中国科学院仪器设备功能开发技术创新项目 ; 安徽省杰出青年科学基金 ; 中国科学院安徽光学精密机械研究所所长基金 ; 黄淮海绿色现代农业集群示范预研项目
文献收藏号	CSCD:5202165