摘要
Hens＇ eggs and corresponding feeds were sampled at commercial farms. The eggs were separated into egg yolk and egg white and freeze dried. After pressure digestion, total element contents of Ca, P, Mg, S, Na, Fe, Mn, Zn, Sr, Cu and Ba were detected by ICP-OES in the eggs, whereas, Pb, Ni, Sb, Sn, AI, Cd, Cr, Mo and V were all or largely below the detection limits. In addition, iodine was done by ICP-MS and Se after ashing with Mg-nitrate by hydride-generation-AAS. There were significant accumulations of P, S, Se and I in the egg yolk versus feed levels, as well as S and Na in the egg white. Just a few correlations between concentrations in feed and egg white resp. egg yolk were detected, indicating regulation mechanisms by homeostasis. Strontium showed the strongest trends between feeds and egg white and egg yolk, whereas, there was none for calcium. Among the main elements in the feeds, sulfur had the strongest effects on the egg compositions, e.g., on iodine and iron in the yolk and on sodium in the white, some of them might be non-linear.
