环境科学
地膜覆盖
生物可分解塑胶
塑料污染
土壤水分
塑料薄膜
塑料袋
塑料废料
堆肥
污染
土壤科学
护根物
废物管理
农学
生态学
工程类
化学
有机化学
图层(电子)
生物
作者
Melanie Braun,Wulf Amelung
标识
DOI:10.1016/j.scitotenv.2017.08.086
摘要
At least 300 Mio t of plastic are produced annually, from which large parts end up in the environment, where it persists over decades, harms biota and enters the food chain. Yet, almost nothing is known about plastic pollution of soil; hence, the aims of this work are to review current knowledge on i) available methods for the quantification and identification of plastic in soil, ii) the quantity and possible input pathways of plastic into soil, (including first preliminary screening of plastic in compost), and iii) its fate in soil. Methods for plastic analyses in sediments can potentially be adjusted for application to soil; yet, the applicability of these methods for soil needs to be tested. Consequently, the current data base on soil pollution with plastic is still poor. Soils may receive plastic inputs via plastic mulching or the application of plastic containing soil amendments. In compost up to 2.38–1200 mg plastic kg− 1 have been found so far; the plastic concentration of sewage sludge varies between 1000 and 24,000 plastic items kg− 1. Also irrigation with untreated and treated wastewater (1000–627,000 and 0–125,000 plastic items m− 3, respectively) as well as flooding with lake water (0.82–4.42 plastic items m− 3) or river water (0–13,751 items km− 2) can provide major input pathways for plastic into soil. Additional sources comprise littering along roads and trails, illegal waste dumping, road runoff as well as atmospheric input. With these input pathways, plastic concentrations in soil might reach the per mill range of soil organic carbon. Most of plastic (especially > 1 μm) will presumably be retained in soil, where it persists for decades or longer. Accordingly, further research on the prevalence and fate of such synthetic polymers in soils is urgently warranted.
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