摘要
采用横向加热石墨炉原子吸收光谱法测定轻质碳酸钙中的铅，用磷酸二氢铵和硝酸镁作混合基体改进剂．消除基体干扰．样品铅的测定相对标准偏差为2．24％，回收率为97．8％～98．2％。检出限为3．6pg．
The method of using transversely heated graphite furnace atomic absorption spectrometry （GFAAS） to detect Pb in light calcium carbonate was studied. NH4H2PO4 and Mg（NO3）2 were used as a matrix modifier so as to eliminate the matrix interference. The relative standard deviation of Pb in the sample is 2.24%, the recovery is 97.8-98.2%. and the detection limit of Pb is 3.6 pg.
