基于LIBS技术的水体重金属连续在线检测方法 
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Continuous Online Detection Method of Heavy Metals in Water Based on LIBS Technology
1 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
2 中国科学技术大学, 安徽 合肥 230026
3 安徽省环境光学监测技术重点实验室, 安徽 合肥 230031
摘要
针对工业废水重金属原位在线监测的需求,提出了基于激光诱导击穿光谱(LIBS)技术的水体重金属连续在线检测方法。采用石墨基底蒸干的富集方式,通过研究样液富集模式、样液定量添加方式、样液蒸干富集方式等,实现了水体中重金属元素的快速自动检测,提高了检测效率和检测能力。对含有Cd、Cr、Cu、Ni、Pb、Zn重金属元素的不同质量浓度的标准溶液进行检测,分别建立了这6种元素的定标曲线,并得到了相应的检测限。多次测量光谱强度相对标准偏差分别为9.24%、10.45%、12.59%、11.58%、15.24%、6.87%,检测限分别为0.03,0.012,0.0047,0.033,0.071,0.0376 mg/L。该方法为水体重金属的在线监测提供了一种有效手段。
Abstract
Aiming at the demand of in-situ online monitoring of heavy metals in industrial wastewater, a continuous online determination method of heavy metals in water based on laser-induced breakdown spectroscopy (LIBS) is proposed. We adopt the enrichment type of graphite substrate evaporation to realize rapid and automatic detection of heavy metal elements in water by studying the enrichment mode of sample solution, method for quantitative addition of sample solution, and evaporation and enrichment type of sample solution, which can improve detection efficiency and capacity. The standard solutions with different mass concentrations of six heavy metal elements including Cd, Cr, Cu, Ni, Pb, and Zn are tested to establish the calibration curves and obtain the corresponding detection limits. The relative standard deviations of multiple measurements of spectral intensity are 9.24%, 10.45%, 12.59%, 11.58%, 15.24%, and 6.87%, respectively. The detection limits are 0.03, 0.012, 0.0047, 0.033, 0.071, and 0.0376 mg/L, respectively. The proposed method provides an effective measure for online monitoring of heavy metals in water.
贾尧, 赵南京, 刘文清, 方丽, 马明俊, 孟德硕. 基于LIBS技术的水体重金属连续在线检测方法[J]. 中国激光, 2018, 45(6): 0611001. Yao Jia, Nanjing Zhao, Wenqing Liu, Li Fang, Mingjun Ma, Deshuo Meng. Continuous Online Detection Method of Heavy Metals in Water Based on LIBS Technology[J]. Chinese Journal of Lasers, 2018, 45(6): 0611001.
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