Determination of cyclic volatile methylsiloxanes in sludge samples collected from To Lich River, Ha Noi, Vietnam
Năm xuất bản
2023
Nhan đề tạp chí
ISSN
Nhan đề tập
Nhà xuất bản
Nguyen Tat Thanh University
Tóm tắt
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.
Mô tả
8 p.
Từ khóa chủ đề
cVMSs, D5, Environment pollution, Sewage sludge, Ha Noi metropolitan, Sông Tô Lịch (Việt Nam - Hà Nội)
Trích dẫn
Nguyen Tat Thanh University. (2023). Journal of Science and Technology - NTTU, Volume 6, Issue 1. ISSN 2615-9015.