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Hóa học lắng đọng khí quyển tại một khu vực nông thôn ở Brasil: Hành vi của các loài kiềm và đầu vào từ nông nghiệp
Tóm tắt
Kể từ những năm 2000, một số nghiên cứu đã báo cáo sự gia tăng các loài kiềm trong lắng đọng khí quyển trên toàn thế giới. Nghiên cứu này nhằm đánh giá và cung cấp sự hiểu biết sâu sắc hơn về hóa học lắng đọng khí quyển được thu thập tại Lavras, một thành phố của Brasil với nền nông thôn. Các mẫu lắng đọng khí quyển tổng thể đã được thu thập từ tháng 3 năm 2018 đến tháng 2 năm 2019 và các loài ion chính đã được định lượng. Giá trị pH dao động từ 5.52 đến 8.29, với trung bình là 5.92 và hầu hết các mẫu lắng đọng (~ 94%) có tính kiềm (pH > 5.60). Trong toàn bộ chiến dịch lấy mẫu, hồ sơ ion theo trung bình trọng số thể tích (VWM) được mô tả như sau: Ca2+ (35.02) > NH4+ (11.26) > Cl− (11.19) > Mg2+ (9.04) > NO3− (8.57) > Na+ (5.65) > K+ (2.61) > SO42− (2.43) > H+ (0.94) μmol L−1. Chúng tôi đã xác định Ca2+ và NH4+ là các loài chiếm ưu thế nhất, chiếm khoảng 53% tổng phân bố các loài ion. Hơn nữa, tất cả các mẫu đều cho thấy chỉ số yếu tố trung hòa (NF) lớn hơn 1, với giá trị trung bình là 6.4. Về phân tích hồi quy, các nguyên tố làm trung hòa độ axit như canxi và amoniac lần lượt chiếm 50% và 4%. Ngoài ra, mẫu dạng kiềm chủ yếu xuất phát từ các nguồn nông nghiệp, bao gồm sản xuất và áp dụng phân bón, cũng như sản xuất xi măng trong khu vực không khí của quận.
Từ khóa
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