PHÂN TÍCH DẠNG HOÁ HỌC VÀ ĐÁNH GIÁ MỨC ĐỘ Ô NHIỄM CỦA ĐỒNG (Cu) TRONG MẪU ĐẤT Ở KHU VỰC MỎ Pb/Zn LÀNG HÍCH, TỈNH THÁI NGUYÊN=ANALYSIS OF CHEMICAL FRACTIONS AND EVALUATION OF COPPER (Cu) CONTAMINATED LEVELS IN SOIL SAMPLES OBTAINED FROM A Pb/Zn MINING SITE LOCATED IN HICH VILLAGE, THAI NGUYEN PROVINCE

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Tác giả: Thị Thu Hà Phạm, Thanh Phương Phan, Trường Xuân Vương

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2024

Mô tả vật lý: tr.330 - 339

Bộ sưu tập: Metadata

ID: 478477

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Currently, the contamination of heavy metals within ore mining regions is pronounced both domestically in Vietnam and globally. The primary objective of this study is to elucidate the chemical speciation of copper (Cu) and conduct an assessment of the magnitude and probability of contamination of Cu in soil samples procured from the Pb/Zn mining, at the Hich village, Dong Hy district, Thai Nguyen province, in order to furnish critical data pertinent to the environmental stewardship of soil resources within this geographical domain. The determination of Cu’s chemical fractions in soil specimens was conducted following Tessier's extraction procedure, utilizing the ICP-MS technique. Results revealed that the mean Cu concentrations across the five tailing samples ranged from 15.524 to 35.192 mg kg-1, while in the seven agricultural samples, concentrations ranged between 15.359 to 21.198 mg kg-1. Predominantly, Cu was identified within the soil fractions in the order of residues (F5) >
carbonate (F2) >
Fe/Mn oxides (F3) >
exchangeable fraction (F1) >
organic carbon (F4). Compliant with Vietnamese standards, Cu concentrations in agricultural soil samples remained below permissible limits. Based on the Igeo index, the majority of soil samples exhibited mildly contaminated levels. Furthermore, according to the Risk Assessment Code (RAC), 11 out of the 12 analyzed soil samples were classified as having a medium risk level.Hiện nay, sự ô nhiễm của kim loại nặng trong các khu vực khai thác quặng đang trở nên rất nghiêm trọng tại Việt Nam và trên toàn cầu. Mục đích của nghiên cứu này là phân tích dạng hóa học của đồng (Cu) và đánh giá mức độ, nguy cơ ô nhiễm của nguyên tố này trong mẫu đất ở khu vực mỏ Pb/Zn Làng Hích, huyện Đồng Hỷ, tỉnh Thái Nguyên, để góp phần có được những thông tin cần thiết trong quản lý môi trường đất ở khu vực này. Hàm lượng Cu trong các dạng hóa học trong các mẫu đất được phân tích theo phương pháp chiết Tessier, sử dụng kỹ thuật ICP-MS. Kết quả cho thấy nồng độ trung bình của Cu trên năm mẫu cát từ 15,524 đến 35,192 mg kg-1, trong khi đó ở bảy mẫu nông nghiệp, nồng độ dao động từ 15,359 đến 21,198 mg kg-1. Chủ yếu, Cu được xác định trong các phân tử đất theo thứ tự: cặn (F5) >
cacbonat (F2) >
oxit Fe/Mn (F3) >
phân tử trao đổi (F1) >
cacbon hữu cơ (F4). Tuân thủ các tiêu chuẩn Việt Nam, nồng độ Cu trong các mẫu đất nông nghiệp vẫn ở dưới ngưỡng cho phép. Dựa trên chỉ số Igeo, hầu hết các mẫu đất cho thấy mức độ ô nhiễm nhẹ. Hơn nữa, theo Mã đánh giá rủi ro (RAC), 11 trong số 12 mẫu đất được phân tích được xác định là có mức độ rủi ro trung bình.

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