Chemical Species of Phosphorus and Zinc in Water-Dispersible Colloids from Swine Manure Compost.
Chemical Species of Phosphorus and Zinc in Water-Dispersible Colloids from Swine Manure Compost.
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DOI：
10.2134/jeq2016.11.0433
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发表时间：
2017-03
影响因子：
2.4
通讯作者：
Kosuke Yamamoto;Y. Hashimoto
中科院分区：
文献类型：
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作者：
Kosuke Yamamoto;Y. Hashimoto
胶体颗粒能加速猪粪堆肥和施用猪粪堆肥的土壤中磷和锌的释放。采用X射线吸收精细结构（XAFS）光谱技术，研究了猪粪堆肥中水分散胶体（WDC）中P和Zn的含量和化学形态。使用过滤和超离心过程从散装猪粪堆肥（<2 mm）中分离和收集WDC（20-1000 nm）。猪粪堆肥含有2.7克/公斤WDC，其中P（140克/公斤）是高度浓缩和Zn浓度大于散装堆肥（1.45克/公斤）。磷K边X射线吸收近边结构（XANES）光谱确定鸟粪石（NHMgPO·6 HO）作为主要的P物种（74%），其次是磷酸三钙作为次要组分（26%）。在WDC馏分中，没有发现鸟粪石，但磷酸三钙（56%）作为主要成分出现。锌K边XAFS光谱测定了菱锌矿[Zn（PO）·4 HO，59%]和较小程度的菱锌矿（ZnCO，24%）和吸附在水铁矿上的Zn（17%）。在WDC馏分中，方解石（44%）和有机结合锌（35%）占主导地位。研究结果表明，猪粪堆肥中磷和锌的浓度和化学形态在WDC和散装级分之间存在显著差异。
The release of phosphorus (P) and zinc (Zn) from swine manure compost and from soils applied with swine manure compost can be accelerated by colloidal particles. This study investigated the concentrations and chemical species of P and Zn in water-dispersible colloids (WDCs) collected from swine manure compost by using X-ray absorption fine structure (XAFS) spectroscopy. A filtration and ultracentrifugation process was used to separate and collect WDCs (20-1000 nm) from the bulk swine manure compost (<2 mm). The swine manure compost contained 2.7 g kg WDC, in which P (140 g kg) was highly concentrated and Zn concentrations were greater than in the bulk compost (1.45 g kg). Phosphorus K-edge X-ray absorption near-edge structure (XANES) spectroscopy determined the presence of struvite (NHMgPO·6HO) as a major P species (74%), followed by tricalcium phosphate as a secondary component (26%). In the WDC fraction, struvite was not found, but tricalcium phosphate (56%) occurred as a primary component. Zinc K-edge XAFS spectroscopy determined hopeite [Zn(PO)·4HO, 59%] and to a lesser extent smithsonite (ZnCO, 24%) and Zn adsorbed on ferrihydrite (17%). In the WDC fraction, hopeite (44%) and organically bound Zn (35%) were predominant. Our results demonstrate the notable difference in the concentration and chemical species of P and Zn between the WDC and bulk fractions of swine manure compost.