Sample tray (a) - Sample is filled in an ultrapure tin combustion capsule One sample is placed on the quartz combustion tube (b) containinggranulated chromium III oxide combustion catalyst (T1200 C) pure O2 is used to assist sample burning Empty tin-capsule blanks ถูกวเิ คราะหด์ ว้ ยเพอ่ื หกั ลบออกจากตย