[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.

[Determination of Na in anticoagulant sodium heparin by flame atomic absorption spectrophotometry].

This paper report the development of the determination of Na in anticoagulant sodium heparin by flame atomic absorption spectrophotometry. The method is convenient and the results show good precision and accuracy. The relative standard deviation (RSD) is 2.