Boonmalai, A. and Pattanatornchai, T. 2021. APPLICATION OF POLYDIACETYLENE REAGENTS IN SIMPLE FLOW INJECTION SPECTROPHOTOMETRIC SYSTEM FOR DETERMINATION OF LEAD IONS . Life Sciences and Environment Journal. 22, 2 (Nov. 2021), 274–286. DOI:https://doi.org/10.14456/lsej.2021.14.