Root tips from the marsh grass Spartina alterniflora, collected from areas of high and low pore-water sulfide, exhibited a substantial capacity to catalyze sulfide oxidation, as determined by closed-chamber respirometry. A large proportion of this catalysis was apparently nonenzymatic and was higher in roots of plants from the high-sulfide versus the low-sulfide site. Activity exhibiting charac...

Tourmaline-bearing quartz veins and replacement deposits, commonly copperand gold-bearing, are found in unusual concentration in northwestern Nevada and adjacent northeastern California in Triassic and Jurassic arc rocks and in the Cretaceous plutons that intrude them. Mines and prospects that exploit the tourmaline-bearing deposits are found in a zone approximately 70 miles long and 50 miles w...

Nowadays, refractory gold ore production around the world accounts for about 30% of total production, and low leaching rate such concentrate seriously limits efficient utilization resources. The alkaline preoxidation process can improve this kind deposit has good development application prospects. Therefore, it is great significance to study oxidation dissolution behavior pyrite in an environme...

Z. Naturforsch. 56 b, 1257-1263 (2001); received September 11, 2001 Gold(I) Complexes, Tri(tertiary phosphine) Complexes, Thiolate Complexes Treatment of the ligand l,3,5-tris[(diphenylphosphanyl)methyl]trimethylbenzene (P3) with (tetrahydrothiophene)gold(I) chloride results in the symmetrical trigold complex [(P3)(AuC1)3]. In the presence of sodium methoxide, [(P3)(AuC1)3] reacts with thiocres...

The interactions of SCNwith aurothiomalate (AuStm) in aqueous solution were studied by 13C NMR spectroscopy. The AuStm remains polymerized in the presence of SCN-, however, SeCNbinds to AuStm forming the NCSe-Au-Stmcomplex. This complex initially disproportionates to give Au(SeCN)2and Au(Stm)2-. The Au(SeCN)2specie eventually decomposes to give metallic gold and metallic selenium (or selenium a...

Electrosynthesis process has been used for preparation of zinc sulfide nanoparticles. Zinc sulfide nanoparticles in different size and shapes were electrodeposited by electrolysis of zinc plate as anode in sodium sulfide solution. Effects of several reaction variables, such as electrolysis voltage, sulfide ion concentration as reactant, stirring rate of electrolyte solution and temperature on p...

Sulfide biooxidation by the novel sulfide-oxidizing bacteria Pseudomonas sp. C27, which could perform autotrophic and heterotrophic denitrification in mixotrophic medium, was studied in batch and continuous systems. Pseudomonas sp. C27 was able to oxidize sulfide at concentrations as high as 17.66 mM. Sulfide biooxidation occurred in two distinct stages, one resulting in the formation of sulfur...

A size-controlled synthesis of gold nanoparticles has been developed by the thermolysis of AuCl(SMe2) in the presence of alkylamines at 120 ◦C. In the procedure, the key intermediate was [Au(NH2R)2]Cl, detected by electrospray ionization (ESI) mass spectrometry. This thermally unstable intermediate was reduced by alkylamines under mild conditions to produce alkylamine-capped gold nanoparticles....

Hydrogen sulfide (H2S) is a highly toxic chemical capable of causing severe health issues. Due to its environmental impact, it critical create effective methods for monitoring. Inkjet printing technology has become an alternative sensor fabrication because economic, fast, and reproducible method mass producing micro-electrodes. Herein, miniaturized 25 mm2 inkjet-printed amperometric presented. ...