Abstract：
Agricultural soils have been identified as potential reservoirs for plastic pollution, with adverse effects on soil properties. Primary sources of plastic input in agricultural landscapes are associated with the application of sewage sludge or compost. Understanding the sources and anticipated plastic content is crucial in mitigating plastic pollution in agricultural fields. This study presents one of the first investigations into the plastic content and other impurities, e.g. glass, of seven organic fertilizers (biowaste compost, digested pig slurry, sewage sludge compost, dry chicken manure, green waste compost, sewage sludge, and a mixed digestate comprising pig slurry, chicken manure, and 74 % renewable raw materials). Potentially visible foreign substances were assessed on the surface of each fertilizer pile. No impurities could be detected in digested pig slurry, chicken manure, and mixed digestate. For the remaining fertilizers, visible potential foreign substances were collected, cleaned, visually described, weighed, photographed, size measured, and chemically characterized using ATR-FTIR. The quantification revealed that plastic particles are the most abundant and are contained in all other fertilizers, in contrast to glass and metal. An increasing trend in plastic particle number per m2: green waste < biowaste < sewage sludge compost < sewage sludge, which is about 4 times greater in sewage sludge than in green waste compost, could be observed. However, sewage sludge compost has the largest plastic mass and surface area per square meter. This illustrates that sewage sludge compost application can be a significant entry pathway for visual plastics into agricultural soils.
摘要：
农业土壤已被确定为塑料污染的潜在水库，对土壤性质有不利影响。农业景观中塑料输入的主要来源与污水污泥或堆肥的应用有关。了解来源和预期的塑料含量对于减轻农业领域的塑料污染至关重要。这项研究是对塑料含量和其他杂质的首批调查之一，如玻璃,七种有机肥料(生物肥料，消化的猪浆，污水污泥堆肥，干鸡粪,绿色废物堆肥，污水污泥,和包括猪浆的混合消化物，鸡粪,和74%的可再生原材料)。在每个肥料堆的表面上评估潜在可见的外来物质。在消化的猪浆中没有检测到杂质，鸡粪,和混合消化物。对于剩余的肥料，收集了可见的潜在外来物质，清洁,视觉描述,称重,拍照,测量的尺寸，并使用ATR-FTIR进行化学表征。量化表明，塑料颗粒是最丰富的，并且包含在所有其他肥料中，与玻璃和金属形成对比。每平方米塑料颗粒数量的增加趋势：绿色废物<生物废物<污水污泥堆肥<污水污泥，污水污泥比绿色堆肥高约4倍，可以观察到。然而,污水污泥堆肥具有最大的塑料质量和每平方米表面积。这说明污水污泥堆肥的应用可能是视觉塑料进入农业土壤的重要进入途径。
