Reagents and solutions
Analytical grade HQ and potassium permanganate of E. Merck (Germany) were used for most of preparations. Other chemicals and salts used in this study were also of analytical grade with greater than 99% purity purchased from different popular companies. Preparation of solutions and final washings of all glassware were performed with doubly distilled water. Fresh solutions of HQ with required strengths were prepared each day for routine work.