Determination of Trace Zirconium in Granodiorite by Inductively Coupled Plasma-Mass Spectrometry with Sealed Acid Digestion at High Pressure
LI Wei-liang;CHENG Xiu-hua;YU Juan;LIU Huan;Xi'an Center of Geological Survey,China Geological Survey;Shaanxi Petroleum Products Quality Supervision and Inspection Station;Faculty of Material Science and Chemistry,China University of Geosciences (Wuhan);
Determination of trace elements in rocks by Inductively Coupled Plasma-Mass Spectrometry with sealed acid digestion at high pressure is widely used in geological analysis. Zirconium occurs as insoluble accessory minerals such as zircon and rutile in granodiorite,so the recovery of zirconium is always low. This study adds the pretreatment process of removing silicon,increasing the amount of hydrofluoric acid and introducing fluoride ions in the solution to form zirconium fluorine complex ions which improves the stability of zirconium. These steps improve the recovery of zirconium( up to 95%) and achieve an accurate determination of trace zirconium in granodiorite. The precision of this method is less than 5%( RSD,n = 11) and the detection limit is 0. 052 μg / g. Zirconium content of granodiorite in the Karamay area is determined by this method,which is consistent with the results determined by the alkaline fusion of Na2O2,Li BO2 and XRF method. Furthermore,this method has a small matrix effect and low detection limit,which can analyze various trace elements( Li,Be,Sc,for example) simultaneously.
【CateGory Index】： P585;O614.412;O657.63