Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China.
School of Software Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.
Talanta. 2020 Jul 1;214:120849. doi: 10.1016/j.talanta.2020.120849. Epub 2020 Feb 19.
The detection sensitivity of chlorine (Cl) and sulfur (S) elements is poor using direct laser-induced breakdown spectroscopy (LIBS) because of the high ionization energy of Cl and S. Therefore, a new technique, namely indirect laser-induced breakdown spectroscopy (ID-LIBS), was proposed to improve the detection sensitivity of Cl and S elements. The method detected Cl in water by indirectly detecting the excess silver (Ag) after the precipitation reaction of Ag and chloride. Similarly, the method indirectly detected S in water by detecting the excess barium (Ba) after the precipitation reaction of Ba and sulfate, due to Ag and Ba with low ionization energy and easy excitation. The lines of Ag I 546.5 nm and Ba I 553.5 nm were detected. The R values of 0.999 and 0.997 were obtained for Cl and S, respectively. The limit of quantitation (LoQ) was 2 mg/L for Cl and 5 mg/L for S. The detection sensitivity was improved by about three orders of magnitude compared to using Cl I 822.17 nm and S I 921.28 nm. The results showed that the technique of indirect LIBS can achieve the sensitive detection of Cl and S in water indicating that the technique has tremendous potential for element analysis of water.
由于氯 (Cl) 和硫 (S) 元素的电离能较高，直接激光诱导击穿光谱 (LIBS) 对它们的检测灵敏度较差。因此，提出了一种新的技术，即间接激光诱导击穿光谱 (ID-LIBS)，以提高 Cl 和 S 元素的检测灵敏度。该方法通过间接检测 Ag 和 Cl 沉淀反应后过量的 Ag 来检测水中的 Cl。同样，该方法通过检测 Ba 和 SO4 沉淀反应后过量的 Ba 来间接检测水中的 S，这是因为 Ag 和 Ba 的电离能低，容易被激发。检测到 Ag I 546.5nm 和 Ba I 553.5nm 谱线。Cl 和 S 的 R 值分别为 0.999 和 0.997。Cl 的定量限 (LoQ) 为 2mg/L，S 的 LoQ 为 5mg/L。与使用 Cl I 822.17nm 和 S I 921.28nm 相比，检测灵敏度提高了约三个数量级。结果表明，间接 LIBS 技术可实现水中 Cl 和 S 的灵敏检测，表明该技术在水质元素分析方面具有巨大潜力。
