Mức độ, phân bố và biến động theo mùa của hydrocacbon thơm đa vòng (PAH) trong không khí xung quanh và các thành phần của cây thông

Sevil Çalişkan Eleren1, Yücel Tasdemir1
1Department of Environmental Engineering, Faculty of Engineering, Bursa Uludag University, Bursa, Turkey

Tóm tắt

Các thành phần của cây thông (Pinus pinea) đã được sử dụng như các mẫu không khí thụ động để xác định nồng độ hydrocacbon thơm đa vòng (PAH) trong khí quyển. Kết quả của chúng tôi cho thấy rằng lá thông và cành thông đã chứng minh thành công về mặt thống kê trong việc mô tả không khí xung quanh. Các mẫu lá thông, cành (1 và 2 năm tuổi) và không khí xung quanh được thu thập hàng tháng trong 1 năm để xác định sự phân bố phân tử và nồng độ tạm thời của các PAH ở khu vực công nghiệp ngoại ô. Nồng độ Σ14PAH trung bình hàng năm cho lá thông, cành 1 năm tuổi, cành 2 năm tuổi và không khí xung quanh lần lượt là 756 ± 232 ng/g DW, 685 ± 350 ng/g DW, 587 ± 361 ng/g DW và 28.29 ± 32.33 ng/m3. Thứ tự nồng độ trung bình của Σ14PAH ở các thành phần cây thông được xác định là lá > cành 1 năm tuổi > cành 2 năm tuổi. Nói chung, nồng độ tăng lên khi diện tích bề mặt của các thành phần cây tăng. Trong các mẫu, PAH 3 vòng và 4 vòng là các hợp chất chiếm ưu thế trong không khí xung quanh, lá thông và cành. Phân đoạn tổng thể hàng năm của PAH 3 vòng và 4 vòng trong không khí là 98,5%, trong khi phân đoạn của PAH 5 vòng và 6 vòng là 1,5%. Mặt khác, PAH 3 vòng và 4 vòng trong lá và cành thông chiếm từ 30% trở lên. Phân đoạn và mức độ của PAH thay đổi theo mùa. Mặc dù các mẫu lá không cho thấy bất kỳ xu hướng theo mùa nào, nhưng mức PAH ở các thành phần cây khác đã thay đổi theo nhiệt độ không khí. Nói chung, giá trị thấp hơn được ghi nhận trong các mùa ấm hơn trong mẫu cành. Tương tự, nồng độ PAH trong không khí xung quanh cao hơn vào mùa đông do sưởi ấm và các điều kiện khí tượng bất lợi.

Từ khóa

#hydrocacbon thơm đa vòng #cây thông #không khí xung quanh #nồng độ PAH #biến động theo mùa

Tài liệu tham khảo

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