不同生理阶段绵羊粪便铜锌残留的检测与分析

Detection and Analysis of Heavy Metal Residue in Feces from Different Physiological Stages of Sheep

旨在研究绵羊不同生理阶段粪便中铜(Cu)和锌(Zn)两种重金属的残留量。选择河北省5市标准化羊场(共18个场),采集不同生理阶段绵羊的新鲜粪便样品(共46份),利用原子吸收光谱法测定两种重金属含量。结果表明,不同生理阶段羊粪便中重金属含量存在一定的差异。从Zn含量看,虽然不同生理阶段绵羊粪Zn含量差异不显著(P>0.05),但成年羊(成年公羊和基础母羊)粪Zn含量最高,平均68.32 mg/kg,其他羊群粪Zn含量分别达63.26 mg/kg(哺乳羔羊)、62.17 mg/kg(育肥羊)和60.98 mg/kg(育成羊);从Cu含量分析,育成羊粪Cu含量最高,约41.88 mg/kg,但与其他阶段羊比较,差异未达显著性水平(P>0.05)。育肥羊、羔羊和成年羊粪Cu含量分别为39.36、38.51和37.17 mg/kg。从两种重金属相关性分析,绵羊粪Cu和Zn含量之间表现出极显著的线性负相关关系(P<0.01,r=-0.84),回归方程为:y=-1.0069x+100.62。虽然本研究中各生理阶段绵羊粪Zn和Cu含量均未超标,但随粪便排出重金属的环境风险仍需要引起足够的重视。

The residue of two heavy metals(Cu and Zn)was investigated in feces of different physiological stages of sheep.The standardized sheep farms(18 farms in total)in 5 cities in Hebei province were selected and fresh feces samples(46 in total)were collected in different physiological stages of sheep.The content of two metals were measured by atomic absorption spectrometry.The results showed that there was some difference among different physiological stages in Cu or Zn content.As for Zn content,no difference(P>0.05)was found among all stages of sheep feces,however,Zn content in feces was the highest in adult sheep including ram and ewe,with an average of 68.32 mg/kg.The Zn content in other stages of sheep feces reached 63.26 mg/kg in suckling lamb,62.17 mg/kg in fattening sheep,and 60.98 mg/kg in bred sheep;for Cu content,the content in feces of growing sheep was the highest among all stages of sheep,with 41.88 mg/kg in growing sheep,however,compared with other stages of sheep,the Cu content demonstrated no difference(P>0.05)among all feces.The Cu content in fattening sheep feces,lamb and adult sheep feces were 39.36,38.5,and 37.17 mg/kg,respectively.From the correlation between two metals,there was a linear negative correlation(P<0.01,r=-0.84)between the Cu and Zn content in sheep feces,and the regression equation was y=-1.0069x+100.62.In this study,both Zn and Cu contents in feces of all physiological stages of sheep did not exceed the native standard,however,the environmental risks from heavy metals in feces should be given enough attention.