PHÂN TÍCH DẠNG HOÁ HỌC CỦA CHÌ (Pb) TRONG MẪU TRẦM TÍCH KHU VỰC KHAI THÁC VÀNG XÃ THẦN SA, HUYỆN VÕ NHAI, TỈNH THÁI NGUYÊN=CHEMICAL FRACTION ANALYSIS OF LEAD (Pb) IN SEDIMENT AT THE GOLD MINING AREA OF THAN SA COMMUNE, VO NHAI DISTRICT, THAI NGUYEN PROVINCE

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Tác giả: Thanh Phương Phan, Trường Xuân Vương

Ngôn ngữ: vie

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

Mô tả vật lý: tr.348 - 356

Bộ sưu tập: Metadata

ID: 478539

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Mining operations have significantly impacted the environment, soil, water, and sediment within the vicinity of gold mining activities. The objective of this study is to analyze the chemical speciation of Pb in sediment samples from the Than Sa gold mining area to obtain comprehensive information regarding the level of Pb contamination in sediment samples from this area. Employing a sequential extraction procedure, the various forms of lead were extracted from six sediment samples. Using the ICP-MS method, the concentrations of lead and its chemical forms in the sediment samples were quantified. Results indicate that the mean total lead concentration in the sediment samples ranged from 29.16 ÷ 89.19 mg/kg, all of which were below the allowable threshold for lead according to Vietnamese regulations for freshwater sediments. The distribution of lead chemical forms in the soil samples predominantly follows the sequence F5 >
F3 >
F2 ~ F4 ~ F1. Assessment based on environmental risk evaluation parameters such as Igeo and RAC reveals that lead concentrations in the sediment samples pose low to moderate levels of risk of pollution.Môi trường, đất, nước và trầm tích ở khu vực mỏ khai thác vàng bị ảnh hưởng nghiêm trọng bởi các hoạt động khai thác. Mục đích của nghiên cứu này là phân tích dạng hóa học của Pb trong các mẫu trầm tích ở khu vực mỏ vàng Thần Sa để có đầy đủ thông tin về mức độ ô nhiễm Pb trong các mẫu trầm tích ở khu vực này. Quy trình chiết tuần tự được áp dụng để chiết các dạng liên kết của chì trong 6 mẫu trầm tích. Hàm lượng của chì trong các mẫu trầm tích và các dạng hóa học được định lượng bằng phương pháp ICP-MS. Kết quả cho thấy, hàm lượng chì tổng số trung bình trong các mẫu trầm tích nằm trong khoảng 29,16 ÷ 89,19 mg/kg, và đều thấp hơn giới hạn cho phép của chì theo quy chuẩn Việt Nam đối với trầm tích nước ngọt. Dạng hóa học của bạc trong các mẫu đất phân bố chủ yếu ở dạng F5 >
F3 >
F2 ~ F4 ~ F1. Dựa trên các thông số đánh giá nguy cơ rủi ro môi trường Igeo và RAC cho thấy, hàm lượng chì ở các mẫu trầm tích nằm ở mức độ rủi ro ô nhiễm ở mức thấp hoặc rủi ro vừa phải.

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