Abstract The at meant of waste water from hexavalent chromium ions with calcium per oxide CaO 2 was investigated. This product is obtained soda ash production waste. Clarified part still suspension (distillation suspension) contains chloride and sodium chloride. process producing peroxide based on the interaction solutions hydroxide. A two-step (reagent) method purification proposed. first stag...

This work describes the uncertainty calculation for determination of chromium oxide in leather. Following various steps which includes assembling a list sources uncertainty, with help basic formula used to calculate measure and as all parameters cause an influence on result because value associated it then effect diagram is made shows correlation between these indicates their result.All individ...