[Determination of trace selenium in milk cow serum with graphite furnace atomic absorption spectrophotometry]

Trace metal selenium in milk cow serums has determined by graphite furnace atomic absorption spectrometry with matrix modifier. It's found that addition the solution of 0.1% Ni(NO3)2 as matrix modifier, the ash temperature will increase up to 1,000 degrees C. 600 degrees C is practically used for ash temperature. D2 lamp is used for background correction. Selenium in milk cow serums was directly determined after addition of 0.1% Ni(NO3)2 without digestion. The method is convenient to determine element in milk cow serum. The results show that the method has good precision and accuracy. The relative standard deviation of selenium. Determination was 4.9%, and the rates of recovery were 93.3%-104%.