Đánh giá sự phân bố pha khí-hạt và nguồn gốc của các ester phthalate và methyl siloxane dễ bay hơi trong không khí trong nhà tại Việt Nam

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Tác giả: Ngọc Châu Chu, Minh Hương Giang Đặng, Quốc Anh Hoàng, Thị Hạnh Lê, Thị Thanh Huyền Nguyễn, Đức Hòa Phùng, Mạnh Trí Trần, Bình Minh Từ

Ngôn ngữ: vie

Ký hiệu phân loại: 628.53 Air pollution

Thông tin xuất bản: TC Khoa học tự nhiên và công nghệ - Đại học Quốc gia Hà Nội, 2020

Mô tả vật lý: 72-80

Bộ sưu tập: Metadata

ID: 492603

Thêm vào giỏ

In this study, the gas-particle distribution characteristics and emission sources of phthalate esters (PAEs) and volatile methyl siloxanes (VMSs) were evaluated for indoor air samples collected from different micro-environments such as homes, offices, kindergartens, hair salons, laboratories, and cars in 4 cities and provinces of Hanoi, Bac Ninh, Thai Binh, and Tuyen Quang, northern Vietnam. In general, total concentrations of PAEs and VMSs were higher in gas phase as compared to particle phase
however, phase distribution profiles of individual compounds were strongly related to their structures and physicochemical properties. For examples, low-molecular-weight compounds such as dimethyl phthalate, diethyl phthalate, D3, D4, L4, and L5 were more abundant in gas phase, while heavier compounds like di(2-ethylhexyl) phthalate and L8 were preferentially associated with particle phase. Assessment of PAE emission sources is relatively difficult because they have been applied in different consumer products and materials. Significant correlation between cyclic VMSs (e.g., D4, D5, and D6) was observed, suggesting their applications in cosmetics and personal care products.Trong nghiên cứu này, đặc trưng phân bố của các ester phthalate (PAEs) và methyl siloxane dễ bay hơi (VMSs) trong pha khí và pha hạt và nguồn gốc của chúng được đánh giá trong mẫu không khí từ các vi môi trường khác nhau như nhà ở, văn phòng, nhà trẻ, salon tóc, phòng thí nghiệm và ô tô tại 4 tỉnh, thành phố ở miền Bắc Việt Nam là Hà Nội, Bắc Ninh, Thái Bình và Tuyên Quang. Nhìn chung nồng độ tổng PAEs và VMSs trong pha khí cao hơn trong pha hạt, tuy nhiên đặc trưng cân bằng pha của từng chất có liên quan mật thiết đến cấu trúc phân tử và tính chất hóa lý của chúng. Ví dụ các hợp chất có phân tử khối thấp như dimethyl phthalate, diethyl phthalate, D3, D4, L4 và L5 phân bố chủ yếu trong pha khí, trong khi các chất có phân tử khối cao hơn như di(2-ethylhexyl) phthalate và L8 lại tích lũy nhiều hơn trong pha hạt. Đánh giá nguồn phát thải của PAEs là một bài toán tương đối phức tạp do sự ứng dụng rộng rãi của chúng trong nhiều sản phẩm tiêu dùng và vật liệu khác nhau. Các chất VMSs mạch vòng (D4, D5 và D6) có mối tương quan khá rõ ràng, phản ánh ứng dụng chủ yếu của chúng trong các sản phẩm chăm sóc cá nhân.

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