Matrix Analyte Comments Reference Automobile catalysts Platinum group elements Exhaust system catalytic converter metal recycling 217 Bronze Cu, Fe, Sn, Mg, Pb, Si Real time laser cleaning of archaeological objects 218 Cement Cl Rapid testing for chloride compared to current analytical methods 219 Ceramic paint Major and minor elements Analysis of pigments to identify pottery fragments 220 Coal ash Si, Al, Ti, Ca, Fe, Mg, Na, K Online monitoring at a coal power plant compared to NAA analysis 221 Crop plants K, P, Mg, Ca Macronutrient analysis in wheat, poppy, barley, and rape, good recovery with ICP method 222 Dyed wool Cr Rapid, inexpensive testing of fabric 223 Explosive residues P, N, Cl, C, Na Detection through glass or plastic barriers such as vehicle windows and on various substrates 224, 225 Filter paper Sm, Eu, Gd Aqueous solution mode membrane filter as support 226 Human hands Ba Barium nitrate residues from a gun shot detected 5.27 days after discharging a weapon 227 Kidney stones C, Ca, H, Mg, N, O and P Identification of different types of stones 228