Chromium exists in sediments in two oxidation states: Cr(III), which is relatively insoluble and nontoxic, and Cr(VI), which is much more soluble and toxic. Chromium(VI) is thermodynamically unstable in anoxic sediments, and acid-volatile sulfide (AVS) is formed only in anoxic sediments; therefore sediments with measurable AVS concentrations should not contain toxic Cr(VI). If this hypothesis h...

soil and sediments of the estuaries and wetlands in northwest of persian gulf are recently polluted with different heavy metals because of municipal and industrial wastewaters. therefore an urgent soil cleaning up and remediation program is vital in this region. consequently, this study was initiated to screen two plant species (festuca arundinacea and cynodon dactylon) for hyperaccumulation of...

Soil and sediments of the estuaries and wetlands in Northwest of Persian Gulf are recently polluted with different heavy metals because of municipal and industrial wastewaters. Therefore an urgent soil cleaning up and remediation program is vital in this region. Consequently, this study was initiated to screen two plant species (Festuca arundinacea and Cynodon dactylon) for hyperaccumulation of...

Cryogenic weathering is a key driver of periglacial sediment composition and properties. Selective mineral-grain caused by freeze-thaw cycles in permafrost environments has the ability to dominate this process, leading silt-rich grain-size distributions. The cryogenic index (CWI) promising tool quantify freezing conditions. It considers low resistance quartz compared feldspars. Using approach, ...

Sulfide is a common product of marine anaerobic respiration, and a potent reactant biologically and geochemically. Here we demonstrate the impact on microbial communities with the removal of sulfide via electrochemical methods. The use of differential pulse voltammetry revealed that the oxidation of soluble sulfide was seen at +30 mV (vs. SHE) at all pH ranges tested (from pH = 4 to 8), while n...