[Determination of lead and cadmium in rapeseed and rapeseed meal with microwave digestion by graphite furnace atomic absorption spectrometry].
Comprehensive utilization of rapeseed and rapeseed meal has been increasingly emphasized, and contaminative problems of heavy metal have been attracting great attention, so it is of quite important significance to determine the contents of Pb and Cd. An effective method was developed for the rapid determination of Pb and Cd in rapeseed and rapeseed meal. Digestive dissolvent, time and pressure were discussed for sample preparation by microwave digestion technique, and the optimum condition of determination by GFAAS was studied. The determination limits were 2.172 and 0.243 microg x L(-1), and the linear arranges were 0-100 microg x L(-1) and 0-8 microg x L(-1) for Pb and Cd, respectively. The recoveries were from 80.8% to 110.7%. The RSD of determination was lower than 5.3%. The method offers traits of low detection limit, high sensitivity, speediness and exactness, and was applied to the determination of Pb and Cd in samples with satisfactory results.
He
Xiao-Min
XM
College of Sciences, Huazhong Agricultural University, Wuhan 430070, China.
Wang
Min
M
Wang
Xiao-Dong
XD
Xue
Ai-Fang
AF
Sheng-Qing
Li
L
Chen
Hao
H
D029741:Brassica rapa / Q000737:chemistry*; D002104:Cadmium / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis*; D007854:Lead / Q000032:analysis*; D008872:Microwaves; D013054:Spectrophotometry, Atomic / Q000295:instrumentation / Q000379:methods*
D002104:Cadmium; D007854:Lead