CIRAD, UPR Recyclage et risque, F-97408 Saint-Denis, Réunion, France.
J Environ Qual. 2010 Feb 19;39(2):531-40. doi: 10.2134/jeq2009.0096. Print 2010 Mar-Apr.
Zinc occurs in high quantity in pig slurry since it is used as an essential micronutrient at high concentrations in animal feeds despite the low Zn assimilation by pigs. Zinc accumulation was measured in soil surface layers that had been amended with pig slurry, while also determining the phytotoxicity as well as the extent of groundwater quality degradation. To accurately predict the mobility and bioavailability of Zn derived from pig slurry spreading, the speciation of this element has to be assessed since the total concentration is not sufficient. This study involved a combination of techniques to investigate Zn speciation in pig slurry. Size fractionation was first performed to account for the complexity of pig slurry, and 75% of total Zn was detected in the 0.45- to 20-mum particle-size range. Then X-ray diffraction, scanning electron microscopy, coupled with energy dispersive spectrometer, and extended X-ray absorption fine structure analyses were combined to assess Zn speciation. The findings highlighted the presence of 49% Zn bound to organic matter, 37% amorphous Zn hydroxides [Zn(OH)(2)], and 14% sphalerite (ZnS).
锌在猪粪中含量很高，因为尽管猪对锌的吸收率很低，但它仍被用作动物饲料中的必需微量元素，添加到很高的浓度。在施用猪粪的土壤表层中测量了锌的积累情况，同时还测定了植物毒性以及地下水质量退化的程度。为了准确预测猪粪施撒导致的锌的迁移性和生物有效性，必须评估该元素的形态，因为总浓度是不够的。本研究采用了多种技术来研究猪粪中的锌形态。首先进行了大小分级，以说明猪粪的复杂性，并且 75%的总锌存在于 0.45 至 20 微米的颗粒大小范围内。然后，结合使用了 X 射线衍射、扫描电子显微镜、能量色散光谱仪和扩展 X 射线吸收精细结构分析，以评估锌的形态。研究结果突出表明，有 49%的锌与有机物结合，37%的无定形锌氢氧化物[Zn(OH)(2)]和 14%的闪锌矿(ZnS)。
