Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Nồng độ và phân bổ nguồn gốc của hợp chất hữu cơ bay hơi (VOCs) trong không khí xung quanh Kuala Lumpur, Malaysia
Tóm tắt
Sự tích tụ của các hợp chất hữu cơ bay hơi (VOCs) trong không khí xung quanh ảnh hưởng đến chất lượng không khí thông qua việc tạo ra ozone ở mức độ bề mặt và khí aerosol hữu cơ thứ cấp. Một nghiên cứu về sự phân bố và phân tích nguồn gốc của VOCs đã được thực hiện tại hai trạm để điều tra tình trạng chất lượng không khí của Kuala Lumpur. Mẫu không khí xung quanh đã được thu thập vào các túi lấy mẫu Tedlar bằng máy bơm lấy mẫu không khí và sau đó được tiền cô đặc bằng sợi chiết xuất vi pha rắn. Phân tích sắc ký khí – khối phổ (GC–MS) đã được sử dụng để đo các loài VOC. Một mô hình điểm thành phần chính tuyệt đối – hồi quy tuyến tính đa biến (APCS–MLR) sau đó đã được áp dụng để xác định các nguồn gốc đóng góp có thể của VOCs. Mười bảy loại VOC đã được phát hiện, trong đó dichloroetan (243 ± 241 ppbv) là loài phong phú nhất tại cả hai trạm. Trong nhóm hợp chất benzen, toluen, etyl benzen và xylen, toluen chiếm ưu thế với trung bình 135 ± 202 ppbv, tiếp theo là p-xilen (41,3 ± 24,7 ppbv), etyl benzen (34,0 ± 32,6 ppbv) và benzen (18,2 ± 12,9 ppbv). Một sự tương quan mạnh giữa benzen và toluen (p < 0,01, r = 0,65) cho thấy ảnh hưởng của khí thải phương tiện giao thông trong thời gian lấy mẫu. Kết quả APCS–MLR chỉ ra rằng các nguồn đóng góp cho VOCs tại các trạm lấy mẫu gồm có sự bay hơi xăng (31 %), khí thải phương tiện giao thông/solvent (22 %), khí thải phương tiện giao thông (21 %), sử dụng máy bơm xăng/solvent (15 %) và khí thải công nghiệp (10 %).
Từ khóa
#hợp chất hữu cơ bay hơi #VOCs #chất lượng không khí #Kuala Lumpur #nghiên cứu môi trườngTài liệu tham khảo
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