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So sánh Ảnh hưởng của Biochar, Xỉ và Quặng Sắt-Mangan đối với Sự Immobilization của Chì và Cadmium trong Đất
Tóm tắt
Nhiều phương pháp cải tạo đã được áp dụng cho đất nhiễm kim loại nặng, tuy nhiên, việc immobilization các kim loại trong đất đồng nhiễm vẫn chưa được làm rõ. Do đó, một nghiên cứu ủ đã được thực hiện để đánh giá các tác động tức thời của các nồng độ khác nhau của biochar (BC), xỉ (SL) và quặng sắt-mangan (FMO) đối với sự immobilization của Pb và Cd thông qua quy trình rửa độc tố (TCLP) theo tiêu chuẩn của Cơ quan Tham khảo Cộng đồng Châu Âu (BCR), CaCl2 và NH4NO3. Phép chiết tách tuần tự của BCR cho thấy giảm các phân đoạn hòa tan trong axit, trong khi tỷ lệ còn lại của Pb và Cd được cải thiện với nồng độ SL và BC tăng lên. Việc bổ sung BC đã làm giảm đáng kể các phân đoạn có thể chiết xuất của cả hai kim loại thông qua TCLP, NH4NO3 và CaCl2 so với SL và FMO. Trong số tất cả các chất cải tạo, việc kết hợp BC vào đất đồng nhiễm đã mang lại kết quả đầy hứa hẹn cho sự immobilization Pb và Cd. Tổng thể, tất cả các chất cải tạo đều cho thấy tác động tích cực và lâu dài đối với việc phục hồi đất đồng nhiễm kim loại nặng và đáng được nghiên cứu theo dõi nâng cao ở quy mô hiện trường.
Từ khóa
#biochar #xỉ #quặng sắt-mangan #chì #cadmium #đất #cải tạo #immobilization #kim loại nặngTài liệu tham khảo
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