Levels of heavy metals in Swarna rice (Oryza sativa) grown in Dinajpur district of Bangladesh
Then rice sample was collected during Aman season (November-January, 2017) from nine different locations such as Sundarpur (SR01), Poyesh (SR02), Dhonigram (SR03) at Kaharol (25° 47′ 4.942″ N, 88° 35′ 46.593″ E), Teghra (SR04) , Kajihat (SR05), Kanchan (SR06) at Biral (25° 37′48.139″ N, 88° 33′ 20.75″ E, and Gabura (SR07), Kawgaon (SR08), Pulhat (SR09) at Sadar (25° 36′ 36.814″ N, 88° 38′ 59.403″ E) sub-districts in Dinajpur, Bangladesh.
Steps to reproduce
One gram of rice powder from each group (NR, BR, and FR) was digested using a 15 ml ternary solution (HNO3/ H2SO4/ HClO4, 5:1:1 v/v) at 80 ºC to make the solution transparent. The total concentration of As, Cd, Cr, Pb, and Zn in digested solution was quantified using a Flame atomic absorption spectrophotometer (FAAS; 240FS, Agilent, Australia). Prior to quantification of HMs, the FAAS was calibrated using a standard of the specific metals. The wavelength (λ) was set at 193.7, 228.8, 357.9, 283.3, and 213.9 nm for the standard As, Cd, Cr, Pb, and Zn solutions, respectively.