Showing papers on "Sodium metavanadate published in 2009"

Preliminary studies on the effect of zinc and selenium on vanadium-induced cytotoxicity in vitro.

Abstract: In the present work, we investigated the cytotoxicity of vanadium and the influence of zinc and selenium on vanadium-dependent cell damage in the BALB/c 3T3 cell culture Treatment of cells for 24 hours with medium containing 50, 100 and 200 μM NaVO 3 caused a significant decrease in the cell viability as measured by MTT test Furthermore, the assays for reactive oxygen species (NBT reduction and phenol red oxidation) demonstrated the increase in superoxide and hydrogen peroxide production In the cotreatment studies, the cells were exposed to NaVO 3 (50, 100 and 200 μM) in the presence of nontoxic concentrations of ZnCl 2 (5 μM) or Na 2 SeO 3 (05 μM) Following 24 h incubation, the cell viability (assessed in MTT assay) and reactive oxygen species generation were evaluated Our data suggest that zinc and selenium, in the concentrations mentioned above, provide no protection against adverse actions induced by sodium metavanadate at concentration levels of 50, 100 and 200 μM To our knowledge, this is the

Process for extracting copper and vanadium pentoxide from waste liquor after cleaning vanadium-removed copper wire sphere

Abstract: A process for extracting copper (Cu) and vanadium pentoxide (V2O5) from a waste solution obtained after cleaning vanadium-removal copper wire balls comprises the following steps: pouring the waste solution obtained after cleaning the vanadium-removal copper wire balls into a sedimentation tank; adding calcium hydroxide for neutralizing the waste solution; sucking the waste solution into a filter press for filter-pressing, to obtain filter residue and filter liquor; adding dilute sulfuric acid to the filter residue, and further feeding the filter residue into the filter press for filter-pressing to obtain filter residue; electrolyzing the filter liquor to obtain pure copper; adding sodium hydroxide solution to the filter residue, and extracting the obtained serofluid with a high-pressure pump; mist-spraying the serofluid in a water tank to obtain serofluid containing sodium metavanadate; removing calcium sulfate through filtration and concentrating the obtained filter liquor to obtain concentrated solution containing sodium metavanadate; adding liquid ammonia to the concentrated solution to obtain sodium metavanadate crystal; and calcining the sodium metavanadate crystal to obtain vanadium pentoxide. The invention has the characteristics of low pollution emission, high production efficiency, simple operating process and the like, and can effectively recover copper and vanadium in the waste water generated after cleaning the copper wire balls, thereby realizing the cyclic utilization of resources.

Selective absorbing surface of solar heat collector and method for forming the same

Abstract: PROBLEM TO BE SOLVED: To provide a method for forming a selective absorbing surface of a solar heat collector, which gives little load to the environment and forms a selective absorbing surface having adequate characteristics on stainless steel in a short period of treatment time. SOLUTION: This forming method includes: preparing a chemical conversion treatment solution by adding 0.5 to 7.0 wt% of sodium metavanadate as a metavanadate to 44.0 to 65.0 wt% of an aqueous solution of sulfuric acid containing sulfuric acid; and immersing the stainless steel in the solution at a bath temperature of 85.5 to 124°C for 75 to 1,320 seconds. COPYRIGHT: (C)2009,JPO&INPIT