Login to enhance your shopping experience.

Login or Create an Account
Main Menu

Sulphate as a selective redox buffer for borosilicate melts V34 66-70

Sulphate as a selective redox buffer for borosilicate melts V34 66-70

Two immiscible liquids form when excess sodium sulphate is mixed with a reference borosilicate melt under oxidising conditions at 1150C. The sulphate rich phase has no effect on the establishment of the individual Fe3+-Fe2+ , Mn3+ -Mn2 +, and Ce4+-Ce3+ redox equilibria in the coexisting borosilicate melt. Nor does it disturb the internal electron exchange reaction between iron and cerium within the borosilicate melt. However, the CrOi- -Cr3+ redox equilibrium in the borosilicate melt is controlled by the immiscible sulphate phase. Not only does the presence of the sulphate liquid effectively shift the equilibrium to form more CrOi- (chromate) at the expense of Cr3+ in the borosilicate melt, but it also preferentially incorporates jive times as much chromate. Even under relatively reducing conditions and/or in the presence of strong reducing agents such as Fe2+ and Mn2+ in the borosilicate melt, both of which should eliminate CrOi- from the system, significant concentrations of the chromate ion are incorporated into the sulphate phase. The SO:--SO2 redox couple 'buffers' the chromate content of the borosilicate melt by an internal electron exchange reaction driven by SO:- -00:- isomorphism.


£ 15.00


All required fields are marked with a star (*). Click the 'Add To Cart' or 'Add To Wish List' button at the bottom of this form to proceed.

Item Quantity

Enter the appropriate quantity for this item below.

Account Menu
Quick Store Search

Advanced Search
Shopping Cart

There are no items in your shopping cart.