“…However, in situ trapping on more durable coatings, such as Zr or Ir, appears to have solved the problem, because repeated application of such coatings does not seem necessary during the lifetime of the graphite tube. There are many reports on mercury vapor absorption on gold-, [64][65][66] platinum-, 67,68 palladium- 69 or iridium-coated 63,70,71 graphite tubes and absorption of hydrides on carbide-forming elements (Zr, Nb, Ta and W) [72][73][74][75] or noble metals (Pt, Pd, Ir or Pd/Ir). [73][74][75][76][77][78][79][80][81][82][83][84][85][86] On-line matrix separation/digestion followed by ETAAS detection ETAAS has very low detection limits for many elements in aqueous solutions, but it is very sensitive to matrix interferences even with sophisticated background correction and chemical modification.…”