Đánh giá khả năng làm giảm nhẹ ô nhiễm Dioxin và Asen trong đất của cỏ Vetiver tại sân bay Biên Hòa=Assessment of the potential of vetiver grass in mitigation of dioxin and arsenic in contaminated soils at Bien Hoa airbase

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Thị Thúy Hường Ngô, Quốc Định Nguyễn, Thị Thanh Thảo Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: TC Khoa học trái đất và môi trường – ĐH Quốc gia Hà Nội, 2018

Mô tả vật lý: tr.45-54

Bộ sưu tập: Metadata

ID: 474259

Thêm vào giỏ

Nghiên cứu này nhằm đánh giá khả năng của cỏ Monto vetiver (Chrysopogon zizanioides L.) trong việc giảm nhẹ ô nhiễm dioxin và xử lý ô nhiễm Asen của cỏ Vetiver. Thí nghiệm được tiến hành ngoài thực tế, gồm 3 lô, mỗi lô 100 m2. Cỏ Monto vetiver được trồng ngày 25/11/2014 trên lô 1 và 2, có hàm lượng dioxin ban đầu khoảng 1000-1800 ppt TEQ, hàm lượng As khoảng 25-30 mg/kg đất khô. Trong đó, lô 1 trồng cỏ và có bổ sung chế phẩm DECOM1 (hỗn hợp muối dinh dưỡng và mùn hữu cơ), lô 2 trồng cỏ và không bổ sung DECOM1, và lô đối chứng, lô 3, không trồng cỏ. Kết quả phân tích dioxin trong mẫu đất, mẫu rễ và chồi cỏ cho thấy cỏ Vetiver có khả năng hấp thụ dioxin vào rễ cỏ và một phần được vận chuyển lên chồi cỏ, dioxin trong đất giảm nhiều tại lô trồng cỏ, đặc biệt lô 1 có xu hướng giảm mạnh hơn. Tương quan giữa hàm lượng dioxin trong mẫu đất và mẫu rễ (p = 0,02, r = 0,53) cho thấy mối liên hệ giữa chúng. Bên cạnh đó, kết quả phân tích Asen trong mẫu đất, rễ và chồi cỏ cũng cho thấy khả năng hấp thụ và xử lý Asen của cỏ Vetiver trong các vùng đất ô nhiễm Asen. Tóm lại, có thể bước đầu kết luận rằng cỏ Monto Vetiver có khả năng làm giảm nhẹ ô nhiễm dioxin và Asen trong các vùng đất bị ô nhiễm ở mức độ vừa.This study aims to initially assess the potential use of Monto vetiver (Chrysopogon zizanioides L.) in mitigating dioxin contamination and the treatment of arsenic contaminated soils. The experiment was carried out in the field, consisting of 3 lots of 100 m2 each. Monto vetiver grass was planted on November 25, 2014 in two groups, lots 1 and 2, with the initial dioxin levels in soil of about 1000-1800 ppt TEQ, arsenic is about 25-30 mg/kg dry soil. Of which, The first group (G1) received DECOM 1, a soil supplement promoting growth of indigenous microorganisms in the rhizosphere, and the second group (G2) as a control, without supplement
the third group, lots 3, was left as blank (without Vetiver). The analyzed results showed that Vetiver grass was able to absorb dioxin into grass roots and was then transported to grass shoots
dioxin in soil was significantly decreased in both G1 and G2 and was slightly stronger in G1 compared to G2. The correlation between dioxin content in soil samples and root samples (p = 0.02, r = 0.53) showed the tight relationship between them. In addition, the results also showed that Vetiver can take up arsenic into its roots and tranported to the shoots and the abiliy of Vetiver in remediation of arsenic contaminated soils. In conclusion, the results confirm that Monto vetiver is suitable for phytoremediation of moderately dioxin and arsenic contaminated sites, particularly when combined with DECOM1

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