Improving Analytical Performance of <scp>Laser‐induced</scp> Breakdown Spectroscopy for Strontium, the Minor Impurity Element, in Salts Using Multiple <scp>Filter‐Paper</scp> Sampling

Strontium (Sr) is an element of toxicological concern due to its close chemical proximity Ca. In this work, Sr in sea salts collected from China and South Korea was analyzed by laser‐induced breakdown spectroscopy (LIBS). The precision could be improved using multiple filter‐paper sampling intensity normalization a weak Na I line as reference signal. analyte signal variation between pieces well that within single piece corrected the suggested method. limit detection ~2 ppm ~5% obtained. As measure accuracy, root‐mean‐square error estimated 9 ppm. can performed easily on salt production sites improves LIBS analysis resulting sufficient quantification capability for minor metallic elements edible products.