... HCO 3- Nong (M) 1,0.1 0-' 2,4.1 0-' NO3 3,0.10' SO4 2- 5,2.10' 1,2.10' 6,0.1 0-' 6,0.1 0-' Na-glutamat PO4 '- Mg^^ 964 Bang Phuong phap phan tich Thanh phdn Asen Fe, Mn PP Phan tich AAS-HVG AAS NO 3-, ... S04 ^-, S^', As the hien tren hinh ';::,;.' J, • , ; , • , • • ' ,; • ^ ^ ^ „ i - - < >N .• Mi n • " ^ - Series • / -. :- - — • -Series2 Series3 • • • ** Series4 • • • • • « • « • • • n - 10 ... md pyrit ra' t Idn d phia Tay Bdc each Ha Ngi khoang 60 km va ra' t nhieu eae diem md vang rai rae; dd khoang arsenopyrit phan bd kha day Trong nhieu nam gan day vice khai thae vang diln rat manh...