激光诱导击穿光谱法（LIBS）作为一种用于检测水溶液中金属离子的分析工具。

Laser induced breakdown spectroscopy (LIBS) as an analytical tool for the detection of metal ions in aqueous solutions.

作者信息

Knopp R, Scherbaum F J, Kim J I

机构信息

Institut für Radiochemie, Technische Universität München, D-85747, Garching, Germany.

出版信息

Anal Bioanal Chem. 1996 Apr;355(1):16-20. doi: 10.1007/s0021663550016.

DOI:10.1007/s0021663550016

PMID:15045451

Abstract

Laser induced breakdown spectroscopy (LIBS) is applied to analyze aqueous solutions of Li(+), Na(+), Ca(2+), Ba(2+), Pb(2+), Cd(2+), Hg(2+) and Er(3+) and suspensions of ErBa(2)Cu(3)O(x) particles (d=0.2 microm). An excimer (308 nm) pumped dye laser with laser pulse at 500 nm and pulse energy at 22+/-2 mJ is used to produce plasma in aqueous solution. Plasma emission lines of the elements are detected by a photodiode array detector. Detection limits of the metal ions are 500 mg/l for Cd(2+), 12.5 mg/l for Pb(2+), 6.8 mg/l for Ba(2+), 0.13 mg/l for Ca(2+), 13 microg/l for Li(+) and 7.5 microg/l for Na(+). No mercury and erbium emission can be detected, even at Hg(2+) and Er(3+) concentrations of up to the g/l range. On the other side, for Er in suspensions of ErBa(2)Cu(3)O(x) particles a more than 10(3) times higher sensitivity is found than for dissolved Er(3+). This result gives a possibility to analyze colloid-borne metal ions with an increased sensitivity.

摘要

激光诱导击穿光谱法（LIBS）用于分析Li(+)、Na(+)、Ca(2+)、Ba(2+)、Pb(2+)、Cd(2+)、Hg(2+)和Er(3+)的水溶液以及ErBa₂Cu₃Oₓ颗粒（d = 0.2微米）的悬浮液。使用一台受准分子（308纳米）泵浦的染料激光器，其激光脉冲波长为500纳米，脉冲能量为22±2毫焦，用于在水溶液中产生等离子体。元素的等离子体发射线由光电二极管阵列探测器检测。Cd(2+)的金属离子检测限为500毫克/升，Pb(2+)为12.5毫克/升，Ba(2+)为6.8毫克/升，Ca(2+)为0.13毫克/升，Li(+)为13微克/升，Na(+)为7.5微克/升。即使Hg(2+)和Er(3+)的浓度高达克/升范围，也检测不到汞和铒的发射。另一方面，对于ErBa₂Cu₃Oₓ颗粒悬浮液中的铒，其灵敏度比溶解的Er(3+)高10³倍以上。这一结果为以更高的灵敏度分析胶体负载的金属离子提供了可能性。