Atomization characteristic of chromium on a molybdenum tube atomizer by electrothermal atomic absorption spectrometry and determination of chromium in biological materials

摘要: Abstract Atomization characteristics of chromium have been studied by electrothermal atomic absorption spectrometry with a molybdenum tube atomizer. The appearance temperature ( T app ) nitrate was 1300°C. independent the heating rate atomizer, but at peak Cr AA signal increased rate. A sensitive obtained in pure argon purge gas. decreased as ratio hydrogen gas increased. optimal flow Ar 480 ml min −1 + H 2 20 because avoidance oxidation absolute characteristic mass (the element giving 0.0044 abs.) atomizer 0.35 pg and detection limit 23 (3S/N). interferences caused large amounts interferents were evaluated. addition thiourea served to eliminate severe interferences. accuracies recommended method considered almost satisfactory for determination biological materials, compared certified values NIST materials. recovery spiked materials range from 93.5 102%.