Wang Yu, Li Jia-xi
National Research Center for Geoanalysis, Beijing 100037, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2009 May;29(5):1418-21.
A method for the analysis of sulfur (S) in plant by molecular absorption of carbon monosulfide (CS) using a high-resolution continuum source atomic absorption spectrometer (CS AAS) with a fuel-rich air/acetylene flame has been devised. The strong CS absorption band was found around 258 nm. The half-widths of some absorption bands were of the order of picometers, the same as the common atomic absorption lines. The experimental procedure in this study provided optimized instrumental conditions (the ratio of acetylene to air, the burner height) and parameters, and researched the spectral interferences and chemical interferences. The influence of the organic solvents on the CS absorption signals and the different digestion procedures for the determination of sulfur were also investigated. The limit of detection achieved for sulfur was 14 mg x L(-1), using the CS wavelength of 257. 961 nm and a measurement time of 3 s. The accuracy and precision were verified by analysis of two plant standard reference materials. The major applications of this method have been used for the determination of sulfur in plant materials, such as leaves. Compared to the others, this method for the analysis of sulfur is rapid, easy and simple for sulfur determination in plant.
已设计出一种使用配备富燃空气/乙炔火焰的高分辨率连续光源原子吸收光谱仪（CS AAS）通过一氧化碳硫化物（CS）的分子吸收来分析植物中硫（S）的方法。在258 nm附近发现了强CS吸收带。一些吸收带的半高宽为皮米量级，与常见的原子吸收线相同。本研究中的实验程序提供了优化的仪器条件（乙炔与空气的比例、燃烧器高度）和参数，并研究了光谱干扰和化学干扰。还研究了有机溶剂对CS吸收信号的影响以及用于测定硫的不同消解程序。使用257.961 nm的CS波长和3 s的测量时间，硫的检测限为14 mg·L⁻¹。通过分析两种植物标准参考物质验证了准确性和精密度。该方法的主要应用已用于测定植物材料（如叶片）中的硫。与其他方法相比，这种分析硫的方法在植物中硫的测定方面快速、简便。
