Ali M. Alamri, Wanxia Zhao, Steve Tassios, Sheng Dai and Zeyad T. Alwahabi
{"title":"利用微波辅助激光诱导击穿光谱法对悬浮固体样品进行元素分析","authors":"Ali M. Alamri, Wanxia Zhao, Steve Tassios, Sheng Dai and Zeyad T. Alwahabi","doi":"10.1039/D4AN00375F","DOIUrl":null,"url":null,"abstract":"<p >A novel analysis technique of elements at ambient conditions has been developed. The technique is based on microwave-assisted laser-induced breakdown spectroscopy (MW-LIBS) applied to acoustically levitated samples. The technique has been demonstrated using three solid samples with different properties and compositions. These are ore containing multiple elements (OREAS 520), aluminium oxide (Al<small><sub>3</sub></small>O<small><sub>2</sub></small>) and gypsum (CaSO<small><sub>4</sub></small>·2H<small><sub>2</sub></small>O). The mass of samples was 21 mg, 23 mg, and 55 mg for gypsum, mineral ore, and Al<small><sub>3</sub></small>O<small><sub>2</sub></small>, respectively. Significant signal enhancements were recorded for a variety of elements, using microwave-assisted laser-induced breakdown spectroscopy and levitation (MW-LIBS–Levitation). The signal enhancement for Mn I (403.07 nm), Al I (396.13 nm) and Ca II (393.85 nm) was determined as 123, 46, and 63 times, respectively. Moreover, it was found that MW-LIBS–Levitation minimises the self-absorption of the Ca I (422.67 nm) and Na I (588.99 nm and 589.59 nm) spectral lines. In addition to the signal enhancements, the levitation process produces a spinning motion in the solids with an angular frequency of 7 Hz. This feature benefits laser-based analysis as a fresh sample is introduced at each laser pulse, eliminating the need for the usual mechanical devices. Based on the single-shot analysis, it was found that ∼80% of the laser pulses produced successful MW-LIBS–Levitation detection, confirming an impressive repeatability of the process. This contactless analytical technique can be applied in ambient pressure and temperature conditions with high sensitivity, which can benefit disciplines such as forensics science, isotope analysis, and medical analysis, where the sample availability is often diminutive.</p>","PeriodicalId":63,"journal":{"name":"Analyst","volume":null,"pages":null},"PeriodicalIF":3.6000,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Elemental analysis of levitated solid samples by microwave-assisted laser induced breakdown spectroscopy\",\"authors\":\"Ali M. Alamri, Wanxia Zhao, Steve Tassios, Sheng Dai and Zeyad T. Alwahabi\",\"doi\":\"10.1039/D4AN00375F\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >A novel analysis technique of elements at ambient conditions has been developed. The technique is based on microwave-assisted laser-induced breakdown spectroscopy (MW-LIBS) applied to acoustically levitated samples. The technique has been demonstrated using three solid samples with different properties and compositions. These are ore containing multiple elements (OREAS 520), aluminium oxide (Al<small><sub>3</sub></small>O<small><sub>2</sub></small>) and gypsum (CaSO<small><sub>4</sub></small>·2H<small><sub>2</sub></small>O). The mass of samples was 21 mg, 23 mg, and 55 mg for gypsum, mineral ore, and Al<small><sub>3</sub></small>O<small><sub>2</sub></small>, respectively. Significant signal enhancements were recorded for a variety of elements, using microwave-assisted laser-induced breakdown spectroscopy and levitation (MW-LIBS–Levitation). The signal enhancement for Mn I (403.07 nm), Al I (396.13 nm) and Ca II (393.85 nm) was determined as 123, 46, and 63 times, respectively. Moreover, it was found that MW-LIBS–Levitation minimises the self-absorption of the Ca I (422.67 nm) and Na I (588.99 nm and 589.59 nm) spectral lines. In addition to the signal enhancements, the levitation process produces a spinning motion in the solids with an angular frequency of 7 Hz. This feature benefits laser-based analysis as a fresh sample is introduced at each laser pulse, eliminating the need for the usual mechanical devices. Based on the single-shot analysis, it was found that ∼80% of the laser pulses produced successful MW-LIBS–Levitation detection, confirming an impressive repeatability of the process. 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引用次数: 0
摘要
我们开发了一种新型的环境条件下元素分析技术。该技术基于应用于声学悬浮样品的微波辅助激光诱导击穿光谱(MW-LIBS)。该技术已使用三种不同性质和成分的固体样品进行了演示。它们是含有多种元素的矿石(OREAS 520)、氧化铝(Al3O2)和石膏(CaSO4.2H2O)。石膏、矿石和 Al3O2 的样品质量分别为 21 毫克、23 毫克和 55 毫克。利用微波辅助激光诱导击穿光谱和悬浮(MW-LIBS-Levitation)技术,记录到多种元素的信号显著增强。锰 I (403.07 纳米)、铝 I (396.13 纳米) 和钙 II (393.85 纳米) 的信号增强分别为 123 倍、46 倍和 63 倍。此外,还发现 MW-LIBS-Levitation 将 Ca I (422.67 nm) 和 Na I (588.99 nm 和 589.59 nm) 光谱线的自吸收降至最低。除信号增强外,悬浮过程还能在固体中产生角频率为 7 Hz 的旋转运动。这一特性有利于基于激光的分析,因为每个激光脉冲都会引入一个新的样品,从而省去了通常的机械装置。根据单次分析发现,约 80% 的激光脉冲都能成功进行 MW-LIBS-Levitation 检测,这证实了该过程具有令人印象深刻的可重复性。这种非接触式分析技术可在环境压力和温度条件下应用,灵敏度高,有利于法证科学、同位素分析和医学分析等学科,因为这些学科的样品可用性往往很低。
Elemental analysis of levitated solid samples by microwave-assisted laser induced breakdown spectroscopy
A novel analysis technique of elements at ambient conditions has been developed. The technique is based on microwave-assisted laser-induced breakdown spectroscopy (MW-LIBS) applied to acoustically levitated samples. The technique has been demonstrated using three solid samples with different properties and compositions. These are ore containing multiple elements (OREAS 520), aluminium oxide (Al3O2) and gypsum (CaSO4·2H2O). The mass of samples was 21 mg, 23 mg, and 55 mg for gypsum, mineral ore, and Al3O2, respectively. Significant signal enhancements were recorded for a variety of elements, using microwave-assisted laser-induced breakdown spectroscopy and levitation (MW-LIBS–Levitation). The signal enhancement for Mn I (403.07 nm), Al I (396.13 nm) and Ca II (393.85 nm) was determined as 123, 46, and 63 times, respectively. Moreover, it was found that MW-LIBS–Levitation minimises the self-absorption of the Ca I (422.67 nm) and Na I (588.99 nm and 589.59 nm) spectral lines. In addition to the signal enhancements, the levitation process produces a spinning motion in the solids with an angular frequency of 7 Hz. This feature benefits laser-based analysis as a fresh sample is introduced at each laser pulse, eliminating the need for the usual mechanical devices. Based on the single-shot analysis, it was found that ∼80% of the laser pulses produced successful MW-LIBS–Levitation detection, confirming an impressive repeatability of the process. This contactless analytical technique can be applied in ambient pressure and temperature conditions with high sensitivity, which can benefit disciplines such as forensics science, isotope analysis, and medical analysis, where the sample availability is often diminutive.