表面活性剂-磺基水扬酸对镱原子吸收光谱的高增敏作用研究

本文就表面活性剂-磺基水杨酸对镱在乙炔-空气火焰中的高增敏作用进行了研究,结果表明,在十二烷基硫酸钠(SDS)与磺基水杨酸(SSA)共存时。镱的灵敏度增高50倍,其它稀土元素和一些阴离子对Yb的干扰得到了有效的抑制,对硫酸根和磷酸根尤其明显,同时也研究了该体系的增敏机理。在Yb-SDS-SSA体系中,镱的检出限为0.031μg/mL,在0.050～2.0μg/mL镱的浓度范围内,其相对标准偏差为3.0％。

Investigation of Enhancement Sensitivity of Ytterbium by Surfactants in Atomic Absorption Spectrometry

In this paper, we studied the effect of surfactants on the sensitivity of Yb in the C₂H₂-Air flame. The absorption of Ytterbium was increased by about 10 or 50 times in the presence of sodium dodecyl sulfate (SDS) or SDSwith the sulfosalicylic acid(SSA), respectively. The interference from other rare earth elements and some acids was greatly depressed,especially from SO₄^2- and PO₄^3-,in the presence of SDSand SSA. Moreover, the mechanism of enhancement of surfactants was also studied. The detective limit of Yb was fallen down to 0.031μg/mLin the presence of SDSand SSA,and the relative standard deviation was 3.0% in the range of 0.05-2.0μg/mL Yb.