Potential transfer of heavy metals from wastewater, biosolids and soil to forage and sheep tissues in the north of Mexico
(0) The potential risk of heavy metals transfer from wastewater and lime stabilized biosolids to forage, livestock and ultimate to hu man health is a serious concern of the society at the north of Mexico. A field experiment was designed to assess the transfer of Cd, Cr, Ni and Pb from soil to oat forage, and forage to sheep tissues. Treatments consisted of biosolids at rates of 0, 25 and 50Mg·ha<1> dry weight basis, and a conventional rate of N fertilizer. Oat (vat. Moneida) was planted in plots of 300m<2> where corral were constructed to grazing sheep. Twenty sheep were observed for 206 days. Soluble and exchangeable forms in soil were high for Cd (32.3％) and for Cr, Ni and Pb were 5.4％, 3.2％ and 3.5％. Heavy metals concentrations in oat plants were not significantly different among treatments. Nickel and Pb concentrations were often higher than Cd, but Cr was not detected by the chemical analysis. Sheep ingested more Ni and Pb, but there was not significant treatment effect on metals concentrations in animal tissues. Cadmium concentration increased 9.22％ in kidney and 5.2％ in liver for the sheep grazed in the treatment with 50Mg biosolids ha<1> when compared with the sheep sacrificed initially.
Sheep tissues oat wastewater biosolids soils
J. p. Flores-Magez E. Jaramillo-Lopez N. W. Assadian G. Di Giovanni
Universidad Autonoma de Ciudad Juarez, Instituto de Ciencias Biomedicas, Av. Henry Dunant 4016, C. P Texas A & M Research & Extension Center 1380 A & M, El Paso, TX Texas A & M University System
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
64-65
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）