hat
7. nan echantiyon préalable elye se yon gwo metal yo, résidus wazon vèmin, manje, silt, rare latè, akwatik pwodwi ak pwoblèm òganik, elatriye.
eng
7. In sample pretreatment to dissolve heavy metals, pesticide residues, food, silt, rare earth, aquatic products and organic matter,etc.