Wet-dry or freeze-thaw alternation can regulate the impacts of farmland plastic pollution on soil bacterial communities and functions.

The persistence of farmland plastic pollution has raised significant concerns regarding its potential long-term impacts on soil health in the context of global climate change. However, there are still gaps in the understanding of the impacts of plastic residues on soil microbial communities and functions in agricultural environments under unstable and extreme climatic conditions. In this study, the effects of plastic residues (two types and three shapes) on farmland soil bacterial communities and functions across varying environmental conditions were investigated through microscopic experiments.

Residual mulch-film characteristics affect heavy metal migration of different soil layers in the subtropical croplands of China.

In recent years, as the abundance of residual mulch film (RMF) in agricultural soil continues to increase, whether the adsorption capacity of its surface affects the migration of heavy metals is a topic of current interest for scholars. Herein, this study investigated the distribution of RMF abundance and metal concentration in different soil layers of 75 plastic-mulching croplands in subtropical China; meanwhile, we also explored the associations of RMF characteristics with metal concentration. The results showed that land type, film mulching amount, and film mulching time were the main factors affecting RMF abundance, distribution, and particle size composition.

Distribution characteristics of poly- and perfluoroalkyl substances in the Yangtze River Delta.

In this work, a method was developed and optimized for the analysis of polyfluoroalkyl and/or perfluoroalkyl substances (PFASs) content in surface water and sediment samples with high instrumental response and good separation. Surface water and sediment samples were collected from the Yangtze River Delta (YRD) to analyze the distribution characteristics of perfluoroalkyl carboxylic acids (PFCAs), perfluoroalkane sulfonic acids (PFSAs), perfluoroalkyl phosphonic acids (PFPAs), perfluoroalkyl phosphinic acids (PFPiAs), and polyfluoroalkyl phosphoric acid diesters (diPAPs). The results showed that the total concentrations of PFCAs and PFSAs in YRD varied from 31 to 902ng/L.

[Distribution Characteristics and Pollution Status of Phthalate Esters in the Groundwater of Hutuo River Pluvial Fan].

A total of 51 groundwater samples were collected from Hutuo River Pluvial Fan in September, 2014, and 6 phthalate esters (PAEs) were analyzed by gas chromatography-mass spectrometry. The distribution characteristics and health risk assessment were investigated in the present study. The results showed that the PAEs could not be detected in only one sample site.

Quantification of metallothioneins in the earthworm by lomefloxacin-europium(iii) fluorescent probe.

A new fluorimetric method was established for the determination of trace amounts of metallothioneins (MT) in earthworm, using a lomefloxacin-europium(iii) (LMLX-Eu(3+)) complex as a fluorescent probe. In a pH 6.5 Tris-HCl buffer solution, MT can markedly decrease the fluorescence intensity of LMLX-Eu(3+) at λ = 613 nm, and the magnitude of the decrease in this intensity was in direct proportion to the concentration of MT.