摘要
对采集于杭州市郊规模化养殖场的猪饲料和猪粪的重金属含量及猪粪中重金属的形态分布进行了研究。结果显示,猪饲料中Zn,Cu,Mn和As的平均含量分别为324.0,294.1,156.2和5.9 mg/kg;猪粪中Zn,Cu,Mn和As的平均含量分别高达1064.00,1018.00,659.90和59.96 mg/kg。参照污泥农用中污染物控制标准(GB4284-84),供试猪粪样品中Zn,Cu含量均超标,As含量超标率为35%。猪粪中Cu以有机结合态为主,Zn和Mn以铁锰氧化物结合态为主,而As则主要以生物有效性高的交换态存在,高达31.2%。按照农田常规施氮量估算的粪便用量施用,土壤耕层中重金属均会有不同程度的增加,长期施用这些高量重金属的畜禽粪便存在污染农产品和生态环境的潜在风险。
The contents of heavy metals in pig feeds and swine manures and fractionation of heavy metals in swine manures ti＇om intensive livestock farms in the suburb of Hangzhou were studied. The results showed that the average contents of Zn, Cu, Mn and As in pig feeds were 324.0, 294.1, 156.2, and 5.9 mg/kg, respectively. Nevertheless, The contents of Zn, Cu, Mn, and As in the swine manures were 1064.00, 1018.00,659.90, and 59.96 mg/kg, respectively. Based on the standard of contamination controlling in sludge for land application（Gb4284-84）, the contents of Cu and Zn in all manure samples exceeded the limitations, while the contents of As exceeded the limitations by 35 %. The sequential extraction of heavy metals in the manure showed that Cu mainly existed as organically bound fraction, Zn mid Mn existed as Fe and Mn oxide-bound fraction, while As existed as exchangeable form （with 31.2% ） which is high available to plant. It could be forecasted that a potential risk of heavy metal contamination to foods and ecological environment would occur if long-term application of the manure at the dosage equal to N demand for crop growth.
出处
《浙江农业学报》
CSCD
2008年第1期35-39,共5页
Acta Agriculturae Zhejiangensis
基金
国家重点基础研究发展计划基金(2007CB109305)
国家自然科学基金(30771292)
浙江省三农五方科技协作计划基金
国际植物营养研究所(IPNI)资助项目
关键词
猪饲料
猪粪
重金属
连续提取
形态分级
pig feed
swine manure
heavy metal
sequential extraction
fractionation
