Saman Rizwan et al. trans. 2021. Effect of Titania (TiO2) Nanoparticles on the Growth of Spinach (Spinacia oleracea) Under Differing Soil Conditions. Pakistan Journal of Analytical & Environmental Chemistry. 22, 1 (Jun. 2021), 60–73. DOI:https://doi.org/10.21743/pjaec/2021.06.08.