贮氢材料和混合稀土中主体及杂质元素ICP-AES分析

Determination of elemental composition for hydrogen storage alloys and mischmetal by ICP-AES

以电感耦合等离子体光谱法连续测定贮氢材料中七个主体元素(La、Ce、Pr、Nd、Co、Mn、Al),混合稀土中四个主体元素(La、Ce、Pr、Nd)和六个杂质元素(Ca、Mg、Cu、Si、Fe、Sm).对稀土元素的光谱干扰进行了较深入的研究,从众多的谱线中选择到灵敏度高、干扰程度小的谱线La 333.749nm,Ce 413.380nm,Pr 414.311nm,Nd 415.608nm,Sm442.434nm,Sm 359.260nm作分析线,并用类似样品组成的基体匹配抑制干扰,从而提高了准确度和精确度.本法简易准确,主体组分标准加入回收率99%～104%,相对标准偏差<2%;杂质标准加入回收率97%～102%,相对标准偏差<15%.不同实验室的测定结果能较好地吻合.

A procedure to determine seven major elements(La,Ce,Pr,Nd,Co,Mn,Al)in hydrogen storage alloys,four major elements(La,Ce,Pr,Nd)in mischmetal and six trace elements(Ca,Mg, Cu,Si,Fe,Sm)in either of these two materials by inductively coupled plasma atomic emission spec-trometry is presented. The spectral interference of rare earth elements was researched deeply. The spectral lines(La 333. 749nm,Ce 413. 380nm,Pr 414. 311nm,Nd 415. 608nm,Sm 442. 434nm, Sm 359. 260nm)were chosen as analytical lines which are of high sensitivity and low interference. The matrix solution with matched components approximate to the samples was used to dispel interference and the accuracy and precision of determination was improved. The standard addition retrieval rate of major components varies from 99%-104% and RSD<2%;of trace components 97%-102% and<15%. The determination results coincide well with those using other methods at different labs.