txij nkawm cov cuab yeej precision Rau cov cuab yeej sib txawv, muaj qee qhov kev xav tau tshwj xeeb. Siv lub atomic fluorescence spectrometer ua piv txwv, nws yuav ua rau muaj teeb meem hauv qab no hauv chav kuaj ib puag ncig: tus nqi fluorescence yog txawv txav thaum lub sij hawm xeem, cov kab xeem fluctuates heev; hydrogenation atomizer tsis muaj nplaim taws; xeem tsis muaj kab xeem