螯合树脂富集辅助激光诱导击穿光谱检测水体中的Cu元素和Mn元素 
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Detection of Copper and Manganese in Water by Laser-Induced Breakdown Spectroscopy Based on Chelate Resin
重庆邮电大学光电工程学院, 光电信息感测与传输技术重庆重点实验室, 重庆 400065
图 & 表
图 1. LIBS实验装置示意图
Fig. 1. Diagram of LIBS experimental setup
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图 2. 样品制备过程示意图
Fig. 2. Diagram of sample preparation
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图 3. 螯合树脂富集Cu、Mn元素前后的光谱。(a)螯合树脂富集Cu元素前后的光谱;(b)螯合树脂富集Mn元素前后的光谱
Fig. 3. Spectra of chelate resin with and without Cu and Mn. (a) Spectra of chelate resin with and without Cu; (b) spectra of chelate resin with and without Mn
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图 4. 特征谱线强度及SBR随激光能量的变化。(a) Cu特征谱线强度及SBR随激光能量的变化;(b) Mn特征谱线强度及SBR随激光能量的变化
Fig. 4. Characteristic line intensity and SBR versus laser energy. (a) Characteristic line intensity and SBR of Cu versus laser energy; (b) characteristic line intensity and SBR of Mn versus laser energy
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图 5. 特征谱线强度及SBR随延迟时间的变化。(a) Cu特征谱线强度及SBR随延迟时间的变化;(b) Mn特征谱线强度及SBR随延迟时间的变化
Fig. 5. Characteristic line intensity and SBR versus delay time. (a) Characteristic line intensity and SBR of Cu versus delay time; (b) characteristic line intensity and SBR of Mn versus delay time
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图 6. 特征谱线强度随激光聚焦位置的变化。(a) Cu特征谱线强度随激光聚焦位置的变化;(b) Mn特征谱线强度随激光聚焦位置的变化
Fig. 6. Characteristic line intensity versus laser focus position. (a) Characteristic line intensity of Cu versus laser focus position; (b) characteristic line intensity of Mn versus laser focus position
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图 7. 样品溶液的流速对特征光谱强度的影响。(a)样品溶液的流速对Cu特征光谱强度的影响;(b)样品溶液的流速对Mn特征光谱强度的影响
Fig. 7. Effect of flow rate of sample solution on spectral intensity. (a) Effect of flow rate of sample solution on characteristic spectral intensity of Cu; (b) effect of flow rate of sample solution on characteristic spectral intensity of Mn
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图 8. 样品溶液pH值对特征光谱强度的影响。(a)样品溶液pH值对Cu特征光谱强度的影响;(b)样品溶液pH值对Mn特征光谱强度的影响
Fig. 8. Effect of pH value of sample solution on characteristic spectral intensity. (a) Effect of pH value of sample solution on characteristic spectral intensity of Cu; (b) effect of pH value of sample solution on characteristic spectral intensity of Mn
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图 9. 定标曲线。(a) Cu元素的定标曲线;(b) Mn元素的定标曲线
Fig. 9. Calibration curves. (a) Calibration curve of Cu; (b) calibration curve of Mn
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表 1Cu元素及Mn元素的检出限
Table1. Detection limits of Cu and Mn
| Element | Slope /(L·mg-1) | δB | LOD /(mg·L-1) |
|---|
| Cu | 18198.30 | 184.81 | 0.03 | | Mn | 4076.97 | 133.78 | 0.098 |
|
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表 2检出限的对比
Table2. Comparison of detection limits
| Element | Ref. | LOD /(mg·L-1) | Approach |
|---|
| 13 | 0.77 | Dehydrated carbon substrate | | Cu | 17 | 0.29 | Paper substrate | | 8 | 0.054 | Single drop microextraction | | This work | 0.03 | Chelate resin substrate | | 17 | 0.13 | Paper substrate | | Mn | 8 | 0.301 | Single drop microextraction | | 18 | 0.62 | Wood substrate | | This work | 0.098 | Chelate resin substrate |
|
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表 3Cu和Mn的质量浓度及回收率
Table3. Mass concentrations and recoveries of Cu and Mn
| Element | Added /(mg·L-1) | Found /(mg·L-1) | Recovery /% |
|---|
| 0.00 | - | - | | 3.00 | 3.06 | 101.93 | | Cu | 5.00 | 4.79 | 95.82 | | 7.00 | 7.57 | 108.09 | | 9.00 | 8.45 | 93.88 | | 0.00 | - | - | | 3.00 | 2.76 | 91.99 | | Mn | 5.00 | 4.81 | 96.13 | | 7.00 | 6.46 | 92.28 | | 9.00 | 9.35 | 103.88 |
|
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郑培超, 李倩雨, 王金梅, 谭癸宁, 赵怀冬, 刘冉宁. 螯合树脂富集辅助激光诱导击穿光谱检测水体中的Cu元素和Mn元素[J]. 中国激光, 2019, 46(8): 0811001. Peichao Zheng, Qianyu Li, Jinmei Wang, Guining Tan, Huaidong Zhao, Ranning Liu. Detection of Copper and Manganese in Water by Laser-Induced Breakdown Spectroscopy Based on Chelate Resin[J]. Chinese Journal of Lasers, 2019, 46(8): 0811001.
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