Rehan I, Khan M Zubair, Rehan K, Mateen A, Aamar Farooque M, Sultana S, Farooq Z
Appl Opt. 2018 Jan 10;57(2):295-301. doi: 10.1364/AO.57.000295.
A spectrometer based on pulsed nanosecond laser-induced breakdown spectroscopy (LIBS) was employed for the quantitative determination of heavy and essential metals in salts from various sources available in Pakistan. Six salt samples were collected from sea salt and rock salt. Toxic metals (Cu, Cd, and Ni) and other microessentials (Fe, Ca, Co, Mg, Mn, S, and Zn) were investigated from the recorded spectra. The detection system was calibrated using a parametric dependence study. The quantitative analyses were accomplished under the assumption of local thermodynamic equilibrium and optically thin plasma. The results by the LIBS technique were in agreement with the outcomes of the same samples studied using a more standard approach like inductively coupled plasma-atomic emission spectroscopy (ICP-AES). When the concentrations of heavy and essential metals were calculated using a calibration-free LIBS method that does not need a standard salt specimen and dilution, both LIBS and ICP-AES were also in good agreement. The limit of detection of the experimental set up was determined for the observed heavy metals in the studied samples.
采用基于脉冲纳秒激光诱导击穿光谱（LIBS）的光谱仪对巴基斯坦可得的各种来源盐中的重金属和必需金属进行定量测定。从海盐和岩盐中采集了六个盐样品。从记录的光谱中研究了有毒金属（铜、镉和镍）以及其他微量必需元素（铁、钙、钴、镁、锰、硫和锌）。使用参数依赖性研究对检测系统进行了校准。在局部热力学平衡和光学薄等离子体的假设下完成了定量分析。LIBS技术的结果与使用电感耦合等离子体原子发射光谱（ICP - AES）等更标准方法研究相同样品的结果一致。当使用无需标准盐样品和稀释的无校准LIBS方法计算重金属和必需金属的浓度时，LIBS和ICP - AES也吻合良好。确定了所研究样品中观察到的重金属的实验装置检测限。
