Xác định methylsiloxan dễ bay hơi tuần hoàn trong mẫu bùn thải sông Tô Lịch, Hà Nội, Việt Nam

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Do Quang Trung, Quang Huong Le, Nu My Ha Nguyen, Thi Phuong Pham, Cam Le Tong, Manh Tri Tran, Manh Trung Vu

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Nguyễn Tất Thành, 2023

Mô tả vật lý: tr.1

Bộ sưu tập: Metadata

ID: 341043

Thêm vào giỏ Liên kết toàn văn

Các methylsiloxan dễ bay hơi tuần hoàn (cVMSs) là các hóa chất tổng hợp, được sử dụng rộng rãi trong các sản phẩm tiêu dùng như vật liệu xây dựng, hộ gia đình, thiết bị điện, y tế, cũng như các sản phẩm chăm sóc cá nhân. Do được sử dụng trong nhiều ứng dụng, cVMS được giải phóng vào nhiều môi trường vi mô khác nhau. Thời gian gần đây, mức độ ô nhiễm của cVMSs trong môi trường, trong đó có bùn thải, đang dần được quan tâm. Trong nghiên cứu này, bốn cVMS điển hình: hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5) và dodecamethylhexasiloxane (D6) được đo trong 20 mẫu bùn được lấy từ nước thải sông Tô Lịch ở Hà Nội bằng cách sử dụng phương pháp sắc kí khí − khối phổ (GC-MS). Giới hạn phát hiện của phương pháp (MDL) và giới hạn chất lượng của phương pháp (MQL) của cVMS trong bùn thải lần lượt nằm trong khoảng (1,20-3,00) ng/g-dw (trọng lượng khô) và (3,60-9,00) ng/g-dw. Độ thu hồi của hợp chất thay thế (tetrakis-(trimethyl siloxane)-silane: M4Q) trong mẫu trắng và mẫu thực là từ (89,4-112) % (RSD: 9,2 %). Tổng nồng độ cVMSs trong các mẫu bùn thải từ sông Tô Lịch dao động từ (260-13.800) ng/g-dw. Trong số các cVMS được nghiên cứu, D5 được tìm thấy ở mức cao nhất trong khoảng (150-6.040) ng/g-dw. Theo hiểu biết của chúng tôi, đây là báo cáo đầu tiên về sự xuất hiện của cVMS trong các mẫu bùn thải tại Hà Nội, cũng như tại Việt Nam. Kết quả chỉ ra rằng sự phân bố cVMS trong môi trường cao đáng kể và cần tiến hành các nghiên cứu sâu hơn.Cyclic volatile methylsiloxanes (cVMSs) are synthesis chemicals used widely in consumer products such as building materials, households, electrical and medical devices, and personal care products. Due to being used in many applications, cVMSs are released into various micro-environments. Recently, the pollution level of cVMSs in the environment including sewage sludge has been gradually concerned. In this work, four typical cVMSs: hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylhexasiloxane (D6) were measured in 20 sludge samples collected from a sewage river (To Lich River) in Ha Noi metropolitan by using the gas chromatography-tandem mass spectrometry (GC-MS) method. The method detection limits (MDLs) and the method qualification limits (MQLs) of cVMSs in sewage sludge were a range of (1.20-3.00) ng/g-dw (dry weight) and (3.60-9.00) ng/g-dw, respectively. Recoveries of the surrogate compound (tetrakis-(trimethyl siloxane)-silane: M4Q) in blank and real samples were from (89.4 to 112) % (RSD: 9.2 %). The total concentrations of cVMSs in sewage sludge samples from To Lich River ranged from (260 to 13,800) ng/g-dw. Among the studied cVMSs, D5 was found at the highest levels in a range of (150-6,040) ng/g-dw. To our knowledge, this is the first report on the occurrence of cVMSs in sewage sludge samples in Ha Noi as well as Vietnam. The results indicate that the distribution of cVMSs in environments is significantly high and further studies should be conducted.

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR