Hassani, M., & Azemi Motlagh, B. (2023). Design and construction of pilot sludge drying package for the excess sludge in petrochemical industries: Heavy metals determination in sludge by polarography and atomic absorption spectrometry. Analytical Methods in Environmental Chemistry Journal, 6(04), 52-64. https://doi.org/10.24200/amecj.v6.i04.315