Dr. R. W. Gaikwad, Head-Department of Chemical Engineering, Pravara Rural Engineering College, Loni, Ahmednagar (MS)-413736, India
E-mail: rwgaikwad@yahoo.com

Dr. Aleksey Hlopitskiy, Associate Professor of the Department of Inorganic matters technology and ecology, Ukrainian State University of Chemical Technology, Ukraine
E-mail: oxidezr@rambler.ru