Spectrophotometric Determination of Total Cr in Water

Total Cr in water samples is determined by spectrophotometric method. Chromium is present in water in different chemical forms and different chemical state as Cr(III) and Cr(VI). Cr species were first converted to Cr(VI) after the oxidation with KMnO4 0.01 M in 100 ͦ C in the presence of H2SO4 and than Cr(VI) was determined by spectrophotometry after complex formation with Difenilkarbazide. The optimal experimental parameters of the method have been studied and the validity of the method was described. This method was tested in water samples of Shkumbini River collected on March 2017 in 4 different stations distributed along the run off, from the upstream to the downstream of the River. Shkumbini River run mostly in Central part of Albania, pass through a high mineralized area with intense activity of mining and metallurgy industry. The most important factors that affect the water quality of Shkumbini River associated with flooding and sedimentation in the River could be attributed to the impact of extensive gravel mining, the transport of material already deposited in the river system and high impact of Elbasani metallurgical plant which actually constitutes an environmental hotspot in Albania. The concentration level of Cr I water samples of Shkumbini River ranged from 1.7 to 8.4 μg/L. Based on NIVA classification, the concentration data reveal to the 1st and 2nd class of quality “good quality to moderately polluted” by indicating a satisfactory situation. Since the river is continually threatened by industrial, urban, and agricultural pollution, it is recommended to maintain a permanent monitoring program of the water qualityPlease write down should contain at least 70 and at most 150 words. It should be set in 9-point font size and should be inset 1.0 cm from the right and left margins. There should be two blank (10-point) lines before and after the abstract. This document is in the required format