The quality of dissolved organic matter extracted at different times from pig compost and its copper binding capacity based on EEM-PARAFAC

• Published in: Ecotoxicology and environmental safety 2021-01, Vol.207, p.111545, Article 111545
• Main Authors: Li, Xinxin, Shi, Zuliang, Wang, Jiuchen, Jiang, Rongfeng
• Format: Article
• Language: English
• Subjects: Animals; Compost tea; Composting; Copper - chemistry; Copper binding capacity; Environmental Pollution; Extraction time; Fertilizers; Humic Substances; Humification; Manure; Metals, Heavy; Soil - chemistry; Spectral analysis; Swine
• ISSN: 0147-6513; 1090-2414
• DOI: 10.1016/j.ecoenv.2020.111545

Dissolved organic matter extracted from compost tea, can be regarded as alternatives to inorganic fertilizers as well to be used as a washing agent for heavy metal polluted soil. However, the composition and quality of compost tea produced under different extraction time are still unknown. The objective of the current study was set to explore the influence of different extraction time (i.e., 6, 12, and 24 h) on the composition, quality, and copper binding capacity of compost tea originated from pig manure compost. The results indicated that the extraction time obviously influenced the phenolic, aromatic carboxylic, and polycyclic aromatic groups of compost tea. In addition, the compost tea undergo the shorter extraction time (i.e., 6 and 12 h) contained more protein and humic-like compositions. Among the all treatments tested herein, the compost tea produced from 12 h extraction time obviously exhibited higher aromaticity, molecular weight, and humification degree than other two treatments. The highest stability constant value (log KM) was observed for the shortest extraction time, i.e., 6.08. According to the quality measures and copper binding capability, shorter extraction times (i.e., 6 and 12 h) would be suggested for compost tea production from pig manure compost. •Extraction time influence the quality and copper binding ability of compost tea.•Compost tea from 6 and 12 h contained more protein and humic-like compounds.•Compost tea produced from 6 h presented higher copper binding ability than others.•Short extraction time (6 and 12 h) was suggested to produce the compost tea.