Đánh giá thành phần ion và cacbon trong bụi mịn PM2.5 trong một giai đoạn mùa đông tại một khu vực đô thị ở Hà Nội

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Nguyễn Văn Duy, Quang Trung Bùi, Thị Hiếu Bùi, Tuấn Việt Hoàng, Xuân Hòa Hoàng, Văn Đạt Mạc, Đức Lượng Nguyễn, Minh Chinh Phạm

Ngôn ngữ: vie

Ký hiệu phân loại: 628.5 Pollution control technology and industrial sanitation engineering

Thông tin xuất bản: Tạp chí Khoa học Công nghệ Xây dựng, 2022

Mô tả vật lý: 54-64

Bộ sưu tập: Metadata

ID: 499251

Thêm vào giỏ

Mục tiêu chính của nghiên cứu này là phân tích, đánh giá diễn biến nồng độ khối lượng của các thành phần ion và cacbon trong bụi PM2.5 phát thải ở quận Hai Bà Trưng, Hà Nội trong giai đoạn mùa đông năm 2021 (từ 5/1 đến 29/1). Nghiên cứu đưa ra những nhận định sơ bộ về nguồn phát thải, các yếu tố tác động tới sự biến đổi của các thành phần trên trong bụi PM2.5 . Kết quả phân tích cho thấy, nồng độ trung bình ngày của bụi PM2.5 là 157,9 ^g/m3 - cao hơn khoảng 3 lần so với giá trị giới hạn của QCVN 05:2013/BtNMT. So sánh cho thấy nồng độ của OC là cao nhất (30,8 |!g/m3), tiếp theo sau lần lượt là SO42- (10,6 |!g/m3), NH4+ (4,1 |!g/m3), EC (2,4 |!g/m3), K+ (1,1 |!g/m3) và thấp nhất là NO3- (0,02 |!g/m3). Mối tương quan rất cao giữa SO42- và NH4+ (R2 = 0,98), cho thấy các thành phần thứ cấp này có thể được hình thành do quá trình oxi hóa của khí SO2 và NH3 phát sinh từ các nguồn vùng trong quá trình lan truyền đến địa điểm khảo sát. Trái lại, NO3 - và EC có thể phát thải chủ yếu từ nguồn thải giao thông từ quá trình oxi hóa của NOx và đốt nhiên liệu cháy không hoàn toàn, trong khi các nguồn đốt sinh khối ở quy mô vùng có thể là nguồn chính phát thải ra một lượng đáng kể K+ và OC.The main objective of this study was to analyze and evaluate the variation in the mass concentrations of PM2.5 's ionic and carbonaceous species in Hai Ba Trung District, Hanoi in winter of 2021 (from Jan. 5, 2021, to Jan. 29, 2021). In addition, this study also identified primary emission sources and factors affecting the variation of those species in PM2.5. The analytical result showed that the daily mean concentration of PM2.5 for the sampling period was 157,9 |!g/m3 - approximately 3 times higher than the limited value in QCVN 05:2013/BTNMT. Comparing daily average concentrations among major ionic and carbonous species, showed the concentration of OC was highest (30,8 |!g/m3), followed by SO42- (10,6 |!g/m3), NH4+ (4,1 |!g/m3), EC (2,4 |!g/m3), K+ (1,1 |!g/m3), and NO3- (0.02 |!g/m3) - lowest value, respectively. Other analytical results showed a very high correlation between SO42- and NH4+ (R2 = 0,98), indicating that these secondary species are likely to be formed by the oxidation of SO2 and NH3 originating from regional sources during long-range transportation to the sampling site. In contrast, NO3 - and EC were possibly emitted greatly from local traffic sources because of the oxidation of NOx, and incomplete combustion, respectively, while regional-scale biomass burning sources could be the main source of the significant amount of K+ and OC.

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR