Matrix effects in argon plasma on elemental analysis of archaeological glazes by inductively coupled plasma atomic emission spectrometry

Abstract

The elemental composition of historical glazes was determined with use of a sequential PU 7000 (Unicam Analytical Systems) inductively coupled plasma atomic emission spectrometer. The lead emission line at 280.199 nm was used to find the optimum viewing position in the plasma for the determination of Si, Pb, Al, Fe, Ca, Mg, Cu, Mn and Zn. The boron emission line at 249.678 nm was used for the determination of B. The matrix effects of easily ionizable elements such as Li and Na were studied. The influence of a matrix of Fe, Si, Pb, Al, Ca, Mn and Cu in the determination of B was also studied. The samples were fused with Li₂B₄O₇ and for the determination of B, samples were melted with sodium carbonate. The US Geological Survey reference materials GXR-2 and GXR-3 were used to test the method. The detection limits for ten elements and the precision of the method were evaluated.