Mansi.... The e-waste is composed mostly of transition metals, Ni, Cr, Cu, etc... The deep blue color is actually a combination of the colors of the solutions of these metals in the acid medium. The bioremediation techniques like the one you are suggesting cannot degrade the heavy metal ions but may change their oxidation state , e. g. Cr (VI) which is toxic into the non-toxic Cr(II) or (III). I recommend the chemical treatment like increasing the pH with ammonia solution addition to precipitate the metal ions. It is faster and more efficient than biological method.... Good luck
our team also works on metal recovery from e-waste : https://www.researchgate.net/publication/328057374_Selective_recovery_of_Copper_from_waste_mobile_phone_printed_circuit_boards_using_Sulphuric_acid_leaching
In your case I am not very clear on the problem that you are facing. From what I gather it has something to do with sample preparation. Sample preparation for AAS analysis involves things like removal of particles via filtration or centrifugation and dilution of sample in order to be within the range of the calibration curve.