Investigation And Analysis Of Pb,Cd,Hg Contamination In Offals,Muscles And Eggs Of Taihang Chicken In Handan Area

Taihang chicken,as one kind of high quality poultry resources in Hebei Province,It has unique taste and with rich nutritional value.However,few reports have beenreported about heavy metals in Taihang chicken products.The task mainly studied about the Taihang chicken products,by using high pressure digestion,atomic absorptionspectrometry(AAS)and atomic fluorescence spectrometry(AFS)instrument to detect and analyze the contents of Pb,Cd,Hg in the hearts,livers,stomachs,chest muscles and eggs of Taihang chicken in Handan area,and the heavy metal pollution was evaluated to determine the safety of Taihang chicken products.The main results are as follows:1.Reference to the national standard of Pb,Cd,Hg elements of high pressure digestion requirements,the method of digestion was confirmed to detect the three elements.Digestion program is:Adding nitric acid to samples overnight(10h),then add hydrogen peroxide to samples,heated at 140?for 3h,and 120?for acid-driven.2.The optimum conditions of AAS and AFS were confirmed for Pb,Cd and Hg in the samples.Method validation results showed the standard curves(R~2)were more than0.999 with good linearity.The limit of detection(LOD)showed that Pb:0.004mg/kg,Cd:0.001mg/kg,Hg:0.001mg/kg,the elements were all within the national standard detection limit requirements.The results of sample recovery rate and precision(RSD)meet the technical requirements of GB/T27404,indicating that the test method is accurate,the results are reliable.3.Through the analysis of Pb,Cd and Hg contents in 416 Taihang chicken and 48egg samples,it was found that the content of Pb in stomachs was significantly higher than other parts(P<0.05),the content of Cd in livers was significantly higher than other parts(P<0.05),the difference of Hg content in hearts,livers,and stomachs were not significant(P>0.05),There was no significant difference in the contents of Pb,Cd and Hg in eggs and chest muscles(P>0.05).The content of the three elements increased with the increase of age,and the content of Pb that collected in mountainous area was slightly lower than that in rural area,the contents of Cd and Hg in the two areas were similar.The contents of Pb,Cd and Hg in the samples were mainly distributed in a lower concentration range.4.The statistical results showed except for 2 samples of Cd that exceed the national standard requirment,the contents of Pb,Cd and Hg in the remaining samples were within the limit of national standard pollutants.The Nemero index results showed that the comprehensive pollution index of the three elements reached highest in livers,and the index of eggs were in a low level.The comprehensive pollution index increased with age,and the pollution index of the samples that collected in mountainous area has no obvious difference with the samples that collected in rural area,all samples are at the safety level with a comprehensive pollution index below 0.70.