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   <subfield code="a">Xác định các đặc tính hoá lý của acid humic và acid humic hoạt hóa. Khảo sát điều kiện hoạt hóa acid humic bằng acid HNO3. Xác định các điều kiện thích hợp của quá trình hấp phụ ion kim loại nặng Cu2+, Zn2+, Pb2+ của acid humic hoạt hóa. Khảo sát khả năng tái hấp phụ của vật liệu. Đóng góp thêm các thông tin, tư liệu khoa học về than bùn và acid humic.</subfield>
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   <subfield code="t">Error 5001 Not defined in file expand_doc_bib_avail.</subfield>
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   <subfield code="t">Error 5001 Not defined in file expand_doc_bib_avail.</subfield>
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