We show that pristine PMMA can spontaneously transfer electrons to species in a liquid, thereby inducing a variety of electron transfer reactions. The electrons that are transferred we call cryptoelectrons; these have a surface density of the order of 5 x 10(13) cm(-2) and are at a considerably more negative reduction potential than the PMMA bonding electrons. For example, metal ions including ...

The activation of persulfate (PS) by Fe(III) for the removal environmental organic pollutants was severely limited low reduction rate from to Fe(II). In present study, we reported that reducing sulfur species (i.e., SO32−, HSO3−, S2−, and HS−) under concentration could significantly accelerate Fe(III)/Fe(II) cycle in Fe(III)/PS system. Under condition 1.0 mM 4.0 PS, performance system poor, onl...

Root secretion of coumarin-phenolic type compounds has been recently shown to be related to Arabidopsis thaliana tolerance to Fe deficiency at high pH. Previous studies revealed the identity of a few simple coumarins occurring in roots and exudates of Fe-deficient A. thaliana plants, and left open the possible existence of other unknown phenolics. We used HPLC-UV/VIS/ESI-MS(TOF), HPLC/ESI-MS(io...

The adsorption capacity of hebba clay and activated carbon towards (Fe 3+ , Cu 2+ , Zn 2+ , Pb 2+ , Cr 3+ , Cd 2+ ) metal ions was studied. The adsorption capacity was investigated by batch experiment. The effect of weight of hebba was studied and the results showed that the removal percentages increased as the weight of sorbent increased. The effect of contact time was also studied and the res...

achillea tenuifolia lam. (asteraceae) afforded a dichloromethane fraction from which three known compounds β-sitosterol (compound1), 5-hydroxy, 4',6,7– trimethoxy flavone (salvigenin compound 2), and methyl-gallate (compound 3) were isolated for the first time. the structure of isolated compounds was elucidated by different spectroscopic methods. applying the molar-ratio method, the comple...

Poaceae plants release 2'-deoxymugineic acid (DMA) and related phytosiderophores to chelate iron (Fe), which often exists as insoluble Fe(III) in the rhizosphere, especially under high pH conditions. Although the molecular mechanisms behind the biosynthesis and secretion of DMA have been studied extensively, little information is known about whether DMA has biological roles other than chelating...

a simple, rapid and sensitive solvent assisted-dispersive solid phase extraction method was developed for the extraction of iron(ii) prior to its spectrophotometric determination. the fe(ii) reacted with 2,4,6-tris(2-pyridyl)-1,3,5-triazine, neutralized with sodium dodecyl sulfate and extracted onto the fine particles of benzophenone which were formed upon rapid injection of a mixture of benzop...

The surge of interest in fluorescent pseudomonads was spurred by discoveries that members of this group are capable of increasing plant growth and suppressing disease upon introduction into the soil or rhizosphere (Burr et al., 1978; Kloepper and Schroth, 1981; Olsen and Misaghi, 1982, 1984; Weller and Cook, 1983). These bacteria produce iron chelators (siderophores) in vitro with high stabilit...

Increasing exposure to arsenic (As) contaminated ground water is a great threat to humanity. Suitable technology for As immobilization and removal from water, especially for As(III) than As(V), is not available yet. However, it is known that As(III) is more toxic than As(V) and most groundwater aquifers, particularly the Gangetic basin in India, is alarmingly contaminated with it. In search of ...

The novel reactions of cluster salts [(μ-RS)Fe(2)(CO)(6)(μ(4)-CS(2))Fe(2)(CO)(6)][Et(3)NH] with Ph(2)PCl, via the insertion of the PPh(2) group into an activated C-S bond, afford the unprecedented tetrairon complexes with the unique SCPPh(2)S ligand which is coordinated to (μ-RS)Fe(2)(CO)(6) and Fe(2)(CO)(6) units in a μ(4)-k(2)C:k(4)S,S' mode (R = Ph, CH(3)O(2)CCH(2)).