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Nồng độ và phân loại HCHs và DDTs trong đất từ hạ lưu sông Jiulong, Trung Quốc
Tóm tắt
Đất là một nguồn quan trọng cho môi trường và các sinh vật khác về sự tích lũy sinh học của các loại thuốc trừ sâu hữu cơ clo (OCPs). Hai mươi bốn mẫu đất bề mặt đại diện đã được thu thập từ hạ lưu sông Jiulong, Trung Quốc, vào năm 2009. Nồng độ của các đồng phân hexachlorocyclohexane (HCHs) dao động từ 0,38 đến 39,52 ng·g−1, với giá trị trung bình là 9,51 ng·g−1. Nồng độ của dichlorodiphenyltrichloroethanes (DDTs) và các sản phẩm chuyển hóa của chúng nằm trong khoảng 0,94–700,99 ng·g−1, với giá trị trung bình là 71,17 ng·g−1. Nồng độ của HCHs và DDTs trong đất thấp hơn mức cấp độ một (50 ng·g−1) theo Tiêu chuẩn Chất lượng Môi trường Trung Quốc (GB15618-1995). Phân tích Cụm Phân cấp (HCA) và Phân tích Tương quan Bivariate của Pearson (PCA) đã được sử dụng để phân tích sự phân bố và mức độ ô nhiễm của OCP trong khu vực này. Kết quả cho thấy DDTs là chất ô nhiễm chính và không có sự tương quan đáng kể giữa nồng độ các OCP khác nhau với tổng hàm lượng carbon hữu cơ (TOC). Một tương quan dương đáng kể đã được quan sát giữa HCHs và DDTs (p<0,01), cho thấy rằng HCHs và DDTs có thể có nguồn gốc và số phận tương tự trong khu vực nghiên cứu.
Từ khóa
#HCHs #DDTs #thuốc trừ sâu hữu cơ clo #ô nhiễm đất #sông Jiulong #phân tích tương quan #phân tích cụm phân cấp.Tài liệu tham khảo
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