Analysis of clays by inductively coupled plasma optical emission spectrometry after closed-vessel microwave-assisted acid decomposition

Quimica nova

Nóbrega, Joaquim A.¹  Blanco, Telma¹  Silva, Claudineia R.² 

[1] Universidade Federal de São Carlos, São Carlos;Universidade de São Paulo, São Carlos

关键词: clays;    microwave-assisted decomposition;    ICP OES.;   

DOI  :  10.1590/S0100-40422005000100023

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In this work aclosed-vessel microwave-assisted acid decomposition procedure for clays wasdeveloped. Aluminum, Ca, Fe, K, Mg, Na, Si, and Ti were determined in clay digestatesby inductively coupled plasma optical emission spectrometry. The most criticalparameter for total decomposition of clays was the composition of the reagentmixture. The applied power and the heating time exerted a less critical influence.Best decomposition conditions were attained using a reagent mixture containing4 mL aqua regia plus 3 mL HF and the heating program was implemented in 12 min.The accuracy of the results was demonstrated using two standard reference materialsand a paired t-test showed a good agreement between determined and certifiedvalues at a 95% confidence level.

【 授权许可】

CC BY