Correlation analysis between the in vivo bioavailability and in vitro bioaccessibility of nitro PAHs in soil: Application of simplified FOREhST in vitro methods based on the Chinese pharmacopoeia.

In this study, the relative bioavailability (RBA) of nitrated polycyclic aromatic hydrocarbons (NPAHs) in soil samples (n = 30) was assessed using an in vivo mouse model. Based on the correlation between the bioaccessibility data obtained from the Tenax improved traditional Fed ORganic Estimation human Simulation Test (FOREhST) in vitro method (TITF) and the bioavailability data obtained from in vivo experiments, the TITF method was further optimized and simplified by referring to the "Pharmacopoeia of the People's Republic of China: Volume IV, 2020" to adjust the formulation and parameters of the gastrointestinal fluid (GIF) in order to establish a simpler and lower cost in vitro method for the determination of the bioaccessibilities of NPAHs. The dose-accumulation relationship of the in vivo experiment showed that the linear dose-response was better in adipose tissue (R = 0.

Bioaccessibility and bioavailability of NPAHs in soils using in vitro-in vivo assays: Comparison of laboratory and outdoor environmental aging effect.

Aging process is one of the most important factors that markedly reduces bioaccessibility and bioavailability (bioac-bioav) of organic contaminants. However, only few data on comparison of the effects of laboratory artificial aging (LAA) and outdoor environmental aging (OEA) processes on nitrated polycyclic aromatic hydrocarbons (NPAHs) bioac-bioav are available. In the current study, oral bioac-bioav of NPAHs in LAA and OEA soils (aging time intervals: 0, 45, 90, 120 and 150 d) were measured by in vitro traditional Fed ORganic Estimation human Simulation Test (FOREhST) and Tenax improved FOREhST (TI-FOREhST) methods, and in vivo mouse model.

[Degradation mechanisms of dimethyl phthalate in the UV-H2O2 system].

To investigate the photodegradation process of dimethyl phthalate (DMP) in the ultraviolet light (UV)-H2O2 system, mass spectrometer was used to identify degradation products and further more, to speculate the possible mechanisms of degradation process. Experimental results showed that the degradation efficiency of 10 mg x L(-1) DMP reached 92.3% in 90 minutes in the UV-H2O2 system, and the more H2O2 was added, the faster DMP decomposed.

Feasibility of a two-stage reduction/subsequent oxidation for treating Tetrabromobisphenol A in aqueous solutions.

A "two-stage reduction/subsequent oxidation" (T-SRO) process consists of Fe-Ag reduction and Fenton-like oxidation under ultrasound (US) radiation. Due to the refractory oxidation of brominated flame retardant, T-SRO was employed to remove Tetrabromobisphenol A (TBBPA) by the combination of first debromination and succeeding oxidation. It indicated that the T-SRO process resulted in a complete decrease in TBBPA concentration and a 99.

[Sorption and desorption behavior of the herbicide mefenacet on soils].

The sorption-desorption experiments of the herbicide mefenacet on five soils with different physicochemical properties were conducted using bath equilibrium methods, and the effects of soil organic matter and pH value on sorption of this herbicide were also investigated. The results showed that the sorption and desorption behaviors of mefenacet on soils could be well described by both the linear model and Freundlich model. Sorption distribution coefficients K(oc) for five tested soil are between 849.

Effect of copper on the degradation of pesticides cypermethrin and cyhalothrin.

The influence of coexisting copper (Cu) ion on the degradation of pesticides pyrethroid cypermethrin and cyhalothrin in soil and photodegradation in water system were studied. Serial concentrations of the pesticides with the addition of copper ion were spiked in the soil and incubated for a regular period of time, the analysis of the extracts from the soil was carried out using gas chromatography (GC). The photodegradation of pyrethroids in water system was conducted under UV irradiation.

[Microwave assisted photocatalytic degradation of phenol in aqueous solution].

Experimental study on microwave assisted photocatalytic degradation of phenol in aqueous solution was carried out with modified domestic microwave oven, electrodeless discharge lamps (EDLs) and TiO2 catalyst. Results showed that the removal rate of phenol in the MAPC process was 92% after 30 min reaction. Loss of total organic carbon (TOC) was 84% .

Photocatalytic degradation of methylene blue in TiO2 aqueous suspensions using microwave powered electrodeless discharge lamps.

Photocatalytic degradation of methylene blue (MB) in TiO(2) aqueous suspensions using microwave (MW) powered electrodeless discharge lamps (EDLs) was studied. MB of initial concentration 100 mg/l was mainly decomposed in the process of photocatalytic degradation using EDLs (PCD/EDLs) after 15 min of irradiation. The corresponding mineralization efficiency was 45%.

Enhanced photocatalytic activity of nanotube-like titania by sulfuric acid treatment.

The TiO2 nanotube sample was prepared via a NaOH solution in a Teflon vessel at 150 degrees C. The as-prepared nanotubes were then treated with H2 SO4 solutions. The TiO2 nanotube has a crystalline structure with open-ended and multiwall morphologies.