高灵敏度的Cd,Co,Hg,Ni,Pb,Tl,Zn通过溶液阴极发光放电光学发射光谱测量,基于阳极可控制的运动
Wenjing Huang1, Zhaoqing Cai1, Yinchenxi Zhang1
1State Key Laboratory of High Performance Ceramics, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, China.
一个新的脉冲式系统使用溶液阴极光放电光学发射光谱学 (SCGD-OES) 增强了微量元素检测. 这种方法提高了灵敏度,并减少了便携式重金属分析的干扰.
科学领域:
- 分析化学 分析化学
- 频谱学是一种光谱学.
- 材料科学 材料科学 材料科学
背景情况:
- 溶液阴极发光放电光学发射光谱 (SCGD-OES) 是一种用于微量元素检测的新兴技术.
- 目前的局限性包括对更广泛应用的增强检测灵敏度和抗干扰能力的需求.
- 使用更高能量的等离子体,例如通过增加电流,可以改善元素排放并减轻矩阵效应.
研究的目的:
- 开发一种类似脉冲的SCGD-OES系统,以提高检测灵敏度和抗干扰.
- 为了研究周期性阳极运动对元素发射强度和信号与背景比的影响.
- 评估系统检测重金属 (Cd,Co,Hg,Ni,Pb,Tl,Zn) 的性能及其对干扰离子的耐受性.
主要方法:
- 与OES集成了一个类似脉冲的SCGD系统.
- 一个烯阳极定期沿 y 轴移动以调节等离子体放电.
- 在优化条件下测量了目标分析物的排放强度和检测极限.
主要成果:
- Cd,Co,Hg,Ni,Pb,Tl和Zn的发射强度与阳极运动同步,当阳极最接近阴极时达到峰值.
- 优化条件导致排放强度提高了3.57.2倍,信号与背景比率提高了2.47.5倍.
- 达到的检测极限低至2μg L-1 (Tl),对共存离子的强耐受性高达300500 mg L-1.1.
结论:
- 成功开发了一种新的脉冲式SCGD-OES系统.
- 该系统通过周期性阳极运动显著提高了检测灵敏度和干扰阻力.
- 这种紧,具有成本效益的平台显示了环境样本中便携式,现场重金属分析的巨大潜力.
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