CO2 (C4) Q1 [b]. The continuous development of mining and metal works, steel and metal alloys production, rubber and pai

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Co2 C4 Q1 B The Continuous Development Of Mining And Metal Works Steel And Metal Alloys Production Rubber And Pai 1 (72.99 KiB) Viewed 54 times

CO2 (C4) Q1 . The continuous development of mining and metal works, steel and metal alloys production, rubber and paint manufacturing, wood processing, production of textiles, fertilizers entails the increasing problems with waste waters, especially the ones containing heavy metal ions with high toxicity (copper, zinc, lead, chromium, vanadium, manganese, iron, cobalt, nickel, etc.) Therefore, the issues of purification of sewages from heavy metals, as well as monitoring the contents of heavy metals in discharged waste waters are essential for securing the environmental safety. In most cases, the sewages of above-mentioned industries simultaneously contain manganese and chromium ions. They are toxic ions and can penetrate rapidly into any environmental object - surface and ground waters and soils, producing hazardous effects of human health and living nature. However, they are valuable components and should be recovered from the waste water Waste water sample from a textile industry contains a mixture of MnO4 and Cr2O72- were collected and analysis was carried out using UV is with the following results. Standards of 1.0 x 104 M KMnO4 and 10 x 10* M K2Cr2O7 also gave the following results: Wavelength (nm) 266 288 320 350 360 MnO4 Standard 0.042 0.082 0.168 0.125 0.056 Absorbances Cr2O72. Standard Mixture 0.410 0.766 0.283 0.571 0.158 0.422 0.318 0.672 0.181 0.366 Analyze the data using least square method. What conclusion can you draw from the concentrations obtained? Is it worthwhile to recover the two metal ions?