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Đã áp dụng và thực hiện thành công quy trình chiết chọn lọc 5 dạng tồn tại của kim loại Ni, Cu, Zn trong trầm tích bao gồm: dạng trao đổi, dạng liên kết với cacbonat, dạng liên kết với Fe-Mn oxi hydroxit, dạng liên kết với hữu cơ, dạng cặn dư nằm trong cấu trúc trầm tích
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