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

Química Nova

Universidade Federal de São Carlos, São Carlos¹  Silva, Claudineia R.¹  Blanco, Telma¹  Nóbrega, Joaquim A.¹  Universidade de São Paulo, São Carlos¹ 

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 a closed-vessel microwave-assisted acid decomposition procedure for clays was developed. Aluminum, Ca, Fe, K, Mg, Na, Si, and Ti were determined in clay digestates by inductively coupled plasma optical emission spectrometry. The most critical parameter for total decomposition of clays was the composition of the reagent mixture. The applied power and the heating time exerted a less critical influence. Best decomposition conditions were attained using a reagent mixture containing 4 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 materials and a paired t-test showed a good agreement between determined and certified values at a 95% confidence level.

【 授权许可】

Unknown