Guerra-Rodríguez E, Alonso J, Melgar M J, Vázquez M
Departamento de Química Analítica, Area Tecnología de los Alimentos, Universidad de Santiago de Compostela, Facultad de Veterinaria, 27002 Lugo, Spain.
Chemosphere. 2006 Dec;65(10):1801-5. doi: 10.1016/j.chemosphere.2006.04.023. Epub 2006 Jun 2.
The presence of heavy metals in composts is a main cause of adverse effects on animal and human health, transmitted through the food chain from the soil, groundwater and plants. In this study, the contents of Zn, Cd, Pb and Cu present in co-composts of poultry manure (liquid or solid) with a co-composting material (barley wastes or chestnut burr/leaf litter) were assessed. A compost of solid manure was used as control because a compost cannot be obtained from the liquid manure. The original solid poultry manure showed a Zn content of 2134+/-75 mg/kg, exceeding the current legal limit in Spain of 1100 mg/kg. In the solid poultry manure co-compost with chestnut burr/leaf litter and barley wastes, Zn content decreased to 813+/-25 mg/kg and 883+/-37 mg/kg, respectively. The contents in heavy metals (Zn, Cd, Pb and Cu) of the co-composts were under the maximum limit permitted under the Spanish legislation, excepting for the Zn level in liquid poultry manure co-composted with chestnut burr/leaf litter.
堆肥中重金属的存在是通过土壤、地下水和植物经食物链对动物和人类健康产生不利影响的主要原因。在本研究中，对家禽粪便（液体或固体）与共堆肥材料（大麦废料或栗苞/落叶层）的共堆肥中锌、镉、铅和铜的含量进行了评估。由于无法从液体粪便中获得堆肥，因此使用固体粪便堆肥作为对照。原始固体家禽粪便的锌含量为2134±75毫克/千克，超过了西班牙目前1100毫克/千克的法定限值。在与栗苞/落叶层和大麦废料共堆肥的固体家禽粪便中，锌含量分别降至813±25毫克/千克和883±37毫克/千克。除了与栗苞/落叶层共堆肥的液体家禽粪便中的锌含量外，共堆肥中重金属（锌、镉、铅和铜）的含量均低于西班牙立法允许的最大限值。
