Correction for non-spectroscopic matrix effects in inductively coupled plasma-atomic emission spectroscopy by internal standardization using spectral lines of the same analyte

The common analyte internal standardization (CAIS) technique was extended to correct for non-spectroscopic matrix effects in inductively coupled plasma-atomic emission spectroscopy (ICP-AES) measurements. The technique is based on simultaneous measurement of two different spectral lines of the same analyte. A matrix correction factor is then estimated from its linear correlation with the ratio of intensities of these two measured lines. Experimental tests with four elements (Ba, La, Mg, and Mn) in three matrices (NaCl, H₂SO₄, HNO₃) demonstrate a significant decrease (from 3 to 22 times) of the matrix effect after correction.