Element Concentration (ppm) Required concentration WHO Standard (ppm) Chromium (Cr) 0.050 0.050 Lead (Pb) 0.280 0.010 Nickel (Ni) 0.070 0.070 Selenium (Se) 19.419 0.010 Arsenic (As) 5.020 0.010 Cadmium (Cd) 0.101 0.003

Table 2: Result obtained from the AAS test carried out on the effluent water at the start of the experiment.