Sridara T, Daosukho S, Subtaeng S, Suanthaisong W. Method validation for simultaneous determination of heavy metals (Hg, Cd, As and Pb) at trace concentration levels in kratom leaves. Bull Appl Sci. [internet]. 2024 Jun. 7 [cited 2026 Apr. 22];13(1):79-91. available from: https://ph03.tci-thaijo.org/index.php/BAS/article/view/1255