[Meta-analysis of the Occurrence Characteristics and Influencing Factors of Microplastics in Agricultural Soil in China].

The potential threat of soil microplastics （MPs, particle sizes smaller than 5 mm） to the agricultural environment and food security production has become a hot issue, but there are few systematic studies on the characteristics and influencing factors of MP pollution in agricultural soil in China. Based on the data of soil MPs and related environmental factors （temperature, precipitation, soil pH, and organic carbon） and social and economic factors （permanent population, gross regional product per capita, gross industrial product per capita, and cultivated land area per capita） extracted from 6 694 samples from 85 published studies from 2020 to 2023, meta-analysis was performed. The characteristics of MPs pollution in agricultural soil and the key factors affecting the accumulation of MPs in soil in six administrative regions of China were analyzed.

[Pollution Characteristics and Risk Assessment of PAHs in the Soil of Wild in Shanxi].

Shanxi is one of the main producing areas of in China. In order to explore the safety of the soil in the areas where grows,70 surface (0-25 cm) soil samples were collected from the main growing areas of in the eastsouth of Shanxi Province in July 2017. The concentration and composition characteristics of 16 polycyclic aromatic hydrocarbons (PAHs) in the sample soils were analyzed using chemical extraction and gas chromatography-mass spectrometry (GC-MS).

[Evaluation of the Potential Agricultural Risks of Polycyclic Aromatic Hydrocarbon Contaminated Soil by Planting L].

In order to evaluate the potential agricultural risks of soil contaminated by polycyclic aromatic hydrocarbons (PAHs), L. was used as a model leaf vegetable plant to investigate the enrichment characteristics of PAHs in the different tissues of L, such as its underground parts (GS) and aboveground parts (YS), which were studied through an experiment involving potted cultivation in PAHs contaminated soil that was taken from the agricultural soil around a coking enterprise area. The concentrations of the different PAHs in the soil and plant tissues were analyzed using ultrasonic oscillation extraction and high-performance liquid chromatography-mass spectrometry (GC-MS) analysis methods.

[Running Condition and Bacterial Community Associated with the Partial Nitritation System].

In partial nitritation process, the sludge concentration was higher than 4000 mg x L(-1), DO was less than 0.2 mg x L(-1), the temperature of 15-29 degrees C, the reactor HRT of 4.6 h, and the circulation ratio was 75%, not only the microbial biomass reached the highest value but also the ratio of nitrite to ammonium of the effluent could be controlled at approximate 1.