微波等离子体炬原子发射光谱法测定铁增敏效应

发布时间：2018-07-06 17:21

本文选题：微波等离子体炬原子发射光谱法 + 铁　；参考：《高等学校化学学报》2017年04期

【摘要】：针对在低功率下工作的微波等离子体炬原子发射光谱法(MPT-AES)存在对一些元素检测灵敏度较低和抗基体干扰能力弱的问题,以氩气为载气和工作气,研究了表面活性剂及镧盐对MPT-AES测定铁的增敏效应,考察了铁测定的工作条件和共存元素对铁测定的影响.实验结果表明,非离子表面活性剂对铁的测定有抑制作用,而阳离子表面活性剂和镧盐对铁的测定有增敏作用,其中镧盐增敏效果最好.以镧盐为增敏剂,不仅可提高MPT-AES测定铁的灵敏度,还可增加共存元素的允许量.当体系中镧浓度为0.500 mg/m L时,至少可使40倍的锌,30倍的钴,20倍的镍、锰,15倍的钙,10倍的镁、铜和钠不影响铁的测定.与不加镧时相比,铁的发射强度提高了2.4倍,检出限由原来的27.5×10~(-3)μg/m L下降为8.5×10~(-3)μg/m L.将本方法应用于原油样品中铁的测定,所得结果与火焰原子吸收光谱法测定结果一致.
[Abstract]:For the low power microwave plasma torch atomic emission spectrometry (MPT-AES) with low sensitivity to some elements and weak resistance to matrix interference, the sensitizing effect of surface active agent and lanthanide on the determination of iron by MPT-AES was studied. The working conditions and common conditions of iron determination were investigated. The experimental results show that the non ionic surfactants have an inhibitory effect on the determination of iron, while the cationic surfactant and lanthanide have the sensitization effect on the determination of iron, and the lanthanum salt sensitizing effect is the best. The lanthanum salt is the sensitizer, which not only improves the sensitivity of MPT-AES for iron determination, but also increases the tolerance of the coexisting elements. When the concentration of lanthanum in the system is 0.500 mg/m L, at least 40 times of zinc, 30 times of cobalt, 20 times of nickel, manganese, 15 times of calcium, 10 times of magnesium, copper and sodium do not affect the determination of iron. The emission strength of iron is 2.4 times higher than that of non adding lanthanum, and the detection limit is reduced from 27.5 x 10~ (-3) g/m L to 8.5 * 10~ (-3) mu g/m L.. The results obtained from the determination of iron in crude oil samples are consistent with those obtained by flame atomic absorption spectrometry.
【作者单位】：辽宁石油化工大学化学化工与环境学部;
【基金】：国家自然科学基金(批准号:21171083)资助~~
【分类号】：TE622.1;O657.31

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