Laser ablation in liquid media is proposed as a new sample preparation technique in elemental composition analysis of
art pigments using inductively coupled plasma optical emission spectroscopy (ICP-OES). Solid samples are transformed
to colloidal solutions of nanosized analyte particles. This makes the technique compatible with convevtional solutionbased
standardization. The dissociation of particles in solution is improved, which increases the accuracy of quantitative
ICP measurements.
A technique is proposed of layer-by-layer laser spectral microanalysis of art pigments, using two-pulse sample atomization with one-shot spectrum registration. The analysis includes on-surface and in-depth profiling of the layer composition. The technique allows to determine distributions of chosen elements along specimen surface. The laser parameters were chosen to obtain regular laser craters of known depth and diameters. The technique has been tested and
optimized at the analysis of model samples with known compositions. The proposed method was used for investigation and ascription two painting from Nesvizh Portrait Gallery (Belarus). The results show good prospects of the LIBS as applied to paintings authentication.
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