Pentachlorophenol dissipation and ferrous iron accumulation in flooded paddy soils with contrasting organic matter contents and incorporation of legume green manures

Titanium Dioxide Nanoparticles Induced an Enhanced and Intimately Coupled Photoelectrochemical-Microbial Reductive Dissolution of As(V) and Fe(III) in Flooded Arsenic-Enriched Soils

“…The SDOC content (mg/g) was calculated according to eq , where C (mg/L) is the DOC concentration of soil DOM extractives, V (L) is the volume of the DOM filtrate, and m (g) is the freeze-dried soil mass. The ratio of absorbance at 250 nm to that at 365 nm (E 2 /E 3 ) was used to indicate the molecular size of DOM . To estimate the capacity of TiO 2 NPs-induced photodegradation of organic substrates, we monitored the removal of TOC in individual identification assays by amending 0.1 g TiO 2 NPs with 36 mL soil DOM extractives in intermittent illumination and dark conditions. …”

“…The ratio of absorbance at 250 nm to that at 365 nm (E 2 / E 3 ) was used to indicate the molecular size of DOM. 37 To estimate the capacity of TiO 2 NPs-induced photodegradation of organic substrates, 38 we monitored the removal of TOC in individual identification assays by amending 0.1 g TiO 2 NPs with 36 mL soil DOM extractives in intermittent illumination and dark conditions.…”

Impacts of enhanced microbial-photoreductive and suppressed dark microbial reductive dissolution on the mobility of As and Fe in flooded tailing soils with zinc sulfide

“…where C (mg/L) is the DOC concentration of the DOM filtrate, V (L) is volume of DOM filtrate, and m (g) is mass of freeze-dried soil. The ratio of absorbance at 250 nm to that at 365 nm (E 2 /E 3 ) and the specific ultraviolet absorbance at 254 nm (SUVA 254 ) were used to estimate the moleculas size and aromatic degree of DOM [28]. Owing to the different ZnS-induced photodegradation capacities of the different organic substrates, the removal of TOC was monitored in the individual identification assays designated as: (1) ZnS (0.1 g) + sodium acetate solution (30 mM, 36 mL), and (2) ZnS (0.1 g) + soil extracted DOM solution (36 mL) under the same intermittent illumination.…”

“…As labile DOM serves as an electron donor, a large amount of electrons obtained from the mineralization of labile DOM can be transferred from metal-reducing bacteria to electron donors (i.e., Fe(III) and As(V)) and form an integrated respiratory chain of EET [5,28]. As acetate was predominant in the liquid phase of the flooded soils, the removal of LDOC mainly resulted from the degradation of acetate.…”