Redox Condition. Redox condition is a manipulable parameter that can be used to optimize growth of a targeted functional group, therefore factors influencing the TW redox condition and its influence on organic carbon removal mechanisms are emphasized. ... (III) after 30-day equilibration period under controlled redox and pH 7.0 conditions (Fig ...

Redox conditions, as indicated by high Fe, are controlled more by geochemical reactivity. In all three predictive models similar types of predictor variables were in the group with the largest relative importance, and these most influential predictor variables exhibited similar directional relations with respect to predicting the probability of ...

The redox conditions under which the magmatic rocks crystallized were controlled by the dominance of oxygen compounds (oxidizing regime) or those of hydrogen (reducing regime), and once established, these conditions likely continued for a long time: from the Late Paleozoic through the Early Cretaceous in eastern Transbaikalia (Mishin et …

Features common to all such redox-active substances are that they are poorly ordered solid phases and/or minerals that form as metastable components under kinetically controlled conditions; we ...

During deposition, redox states in different locations evolved differently: oxygenated marine environment with the signal of anoxia in two short intervals (48–58 m, 70–76 m) in the Jixian section; a euxinic condition in the Qinghe section; dominantly ferruginous conditions in the JQ-1 well, YJ-2 well, and CQ-1 well (Figure 3d).

Cheng-Quan Wu's 3 research works with 6 citations and 374 reads, including: The redox-conditions controlled manganese carbonate mineralization in the Paleozoic Qiaerlong deep basin, Western Kunlun ...

The importance of redox conditions for the mobility of As has been investigated in many previous studies that have proved the interrelationship between As and other redox sensitive environmental factors using laboratory experiments subjected to redox cycles [3,4,12,[25], [26], [27]]. ... Controlled variation of redox conditions in a …

The failure, therefore, to rearrange the redox steady state constitutes a condition of altered homeostasis and is seen as decreased health condition. In essence, we propose that a major hallmark of physiological health is the capability to maintain a redox steady state escaping from an excess of oxidations primed by the response to the …

Redox conditions are an important regulator of aqueous biogeochemistry because the oxidation state of elements affects their solubility, adsorption behavior, toxicity, and distribution of soil systems. The influence of redox potential on arsenic speciation and …

The local redox conditions in the Arena basin are similar to several other anoxic basins during the Cryogenian interglacial, namely MacDonaldryggen Mb, Datangpo Fm, Twitya Fm and Black River Dolomite (Feng et al., 2010, Li et al., 2012, Zhang et al., 2015, Canfield et al., 2008, Kunzmann et al., 2015).

Each of the three experimental systems (0–2 cm, 0–5 cm and 0–10 cm sediment–water microcosms) were subjected to four different treatments to simulate a gradient of redox modulations covering anoxic (sulfidic) to oxic conditions (Fig. 1).The four treatments were: (1) 24 h purging with N 2 gas, (2) 0.5 h purging with synthetic air …

Oxidation/Reduction (Redox) The redox state of groundwater—whether the groundwater is oxic (oxidized) or anoxic (reduced)—has profound implications for groundwater quality. Knowing the redox conditions of groundwater can help determine whether it contains elevated levels of many contaminants, including arsenic, nitrate, and …

The lack of an increasing trend toward higher (Mo/U) auth ratios with increasing U EF and Mo EF is not consistent with Mo–U covariation pattern of open marine systems where U and Mo enrichment are controlled by variation in redox conditions alone, and (Mo/U) auth ratios can reach up to about 3 times that of modern seawater in …

PurposeSerpentine soils exist in many regions around the world; they are naturally enriched with nickel (Ni). An adequate understanding of soil processes determining Ni solubility is a special need particularly since less research has been addressed to Ni behavior under dynamic and controlled redox conditions. Our aim was (1) to …

This model supports the model for direct Mn-carbonate precipitation from redox-stratified water columns and means that sedimentary Mn mineralization may be mainly controlled by hydrothermal ...

The kinetics of the dissolved As and Sb species under the different redox conditions are shown in Fig. 1. Under the aerobic condition (Fig. 1a), the concentration of dissolved As(III) was 7.39 × 10 − 4 mg L − 1 at the initial stage and then slightly increased to a terminal concentration of 2.90 × 10 − 4 mg L − 1.

From these studies, we find out the electron transfer reaction of [Fe(CN)6]3−/4− redox couple is completely diffusion controlled on both Au and Pt disc shaped electrodes in presence of sweat ...

Redox conditions refer to media dominated by oxidants (oxidizers, oxidizing agents, electron acceptors), the substances that have ability to oxidize other substances (cause them to lose electrons), or reductants (reducers, reducing agents, electron …

Sediment redox was cycled step wise in 50 mV increments between oxidized (-200 to +500 mV) and reduced (+500 to -200 mV) conditions. Changes in sediment oxidation/reduction ...

Redox conditions and pH are controlling factors. Learn More The redox conditions of groundwater strongly affect the mobility and persistence of many contaminants in groundwater. Redox conditions determine whether some chemical …

In the redox chemistry of S, metal immobilization can be induced under anoxic conditions due to the presence of hardly soluble sulphides, but the release of As may be attributed to dissolution of ...

Serpentine soils exist in many regions around the world; they are naturally enriched with nickel (Ni). An adequate understanding of soil processes determining Ni solubility is a special need particularly since less research has been addressed to Ni behavior under dynamic and controlled redox conditions. Our aim was (1) to …

The redox-cycling, capacitive, and conductive electron transfer mechanisms in pyrogenic carbon functioned as an electron snorkel, which facilitated extracellular electron transfer and stimulated ...

Request PDF | Pig carcass-derived biochar caused contradictory effects on arsenic mobilization in a contaminated paddy soil under fluctuating controlled redox conditions | Contamination of paddy ...

A study of cerium in zircon minerals has allowed an assessment of the redox conditions that prevailed when Earth's earliest magmas formed. The results suggest that the mantle became oxidized ...

These studies emphasize that redox conditions and paleoclimatic conditions were likely responsible for OM accumulation during the Toarcian. The Toarcian (Early Jurassic) sediments are regarded as the most significant hydrocarbon source rocks in the Qiangtang Basin, Qinghai–Tibet Plateau. ... The purpose is to discuss which factors …

Redox conditions are an important regulator of aqueous biogeochemistry because the oxidation state of elements affects their ... (III) after 30-day equilibration period under controlled redox and pH 7.0 conditions (Fig. 5). Fig. 5. Distribution of soluble arsenic species at two soils after 30 days of contact (pH 7.0 for −200, 0, 200, and 400 ...

Oxidizing conditions facilitate the mobility of Cd, Cu, Mn, Ni, and Zn to a great extent in the studied soil, which may be attributed to dissolution of sulphides and the resulted release of metals. The solubility of Fe is mainly controlled by the formation of Fe (hydr)oxides under oxidizing conditions and their dissolution under reducing ...

Different B Mo isotopic fractionation controlled by redox conditions. Boron and Mo can undergo isotopic fractionation during dehydration and melting of the subducted slab because the fluids/melts preferentially incorporate 11 B and 98 Mo, while 10 B and 95 Mo are retained in the residual rocks (Hervig et al., 2002; Chen et al., 2019).

Highlights As release from two solid matrices was explored under different redox conditions. As content in vegetal matter is one order of magnitude larger than in sand. High correlation between redox conditions and As release was evidenced from the tests. Vegetal matter has large binding capacity and can enhance As release to …