水中镉含量的激光诱导击穿光谱高灵敏快速检测
High-sensitive and rapid determination of cadmium concentration in water with laser-induced breakdown spectroscopy
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摘要: 为了对水中的痕量镉进行高灵敏快速检测，实验采用一种未受污染的薄木片作为基底来吸收水样品，将其晾干后再用激光诱导击穿光谱（LIBS）技术对其进行分析，克服了用LIBS技术直接分析水样品时灵敏度低和稳定性差等问题。实验中选择214.44 nm的镉离子线作为分析线以提高光谱检测的灵敏度，建立了用于定量分析的校正曲线，镉的检出限达到55 μg/L，重复测量的信号相对标准偏差小于5%,单次测量的时间短于5 min。
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关键词:
- 镉 /
- 激光诱导击穿光谱 /
- 快速分析 /
- 环境污染监测 Key words:
Abstract: To realize high-sensitive and rapid analysis of trace cadmium in water, an unpolluted thin wood slice was chosen as substrate to absorb water sample and then analyzed with laser-induced breakdown spectroscopy(LIBS) after being dried, which overcomes the drawbacks of low sensitivity and reproducibility existing in the process of direct analysis of water sample with LIBS. The 214.44 nm ionic line of cadmium was chosen as analytical line. A calibration curve was established for the purpose of quantitative analysis. The limit of detection of cadmium in water was determined to be 55 μg/L and the relative standard deviation of signal in different measurements was less than 5%. The time needed for each measurement was less than 5 min. -
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