摘要
用微波消解法进行样品消解,原子吸收光谱法测定了小麦粉国家标准物质中铅、铜、镉、镁、锰、铁6种元素的含量。其中镁、锰、铁用火焰原子化法,铅、铜、镉用石墨炉原子化法,方法的相对标准偏差分别为1.43%(镁),4.72%(镉),5.20%(锰),6.04%(铜),13.8%(铁)及18.7%(铅),检出限分别为0.001(铅及铜),0.000 1(镉),0.01(锰)及0.02(镁和铁)mg.kg-1。
Contents of lead, copper, cadmium, magnesium, manganese and iron in wheat powder were determined by atomic absorption spectrometry. Sample of wheat powder was digested with HNO3 in a tightly closed vessel heated with micro-wave. The sample solution obtained were submitted for AAS determination of the 6 elements, among which flame-atomization was used for Mg, Mn and Fe, while graphite furnace-atomization was used for Pb, Cu and CA. Working conditions of instrument and other AAS analytical conditions were tested and described in detail. Detection limits were found as （mg · kg^-1） 0. 001 （for Pb and Cu）, 0. 000 1 （for Cd）, 0. 01 （for Mn） and 0. 02 （for Mg and Fe）. Values of RSD＇s （n=8） obtained were 1.43% （Mg）, 4. 72% （Cd）, 5. 20% （Mn）, 6. 04% （Cu）, 13. 8% （Fe） and 18. 7% （Pb）.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2008年第4期355-356,358,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
