Duyệt theo Tác giả "Le, Minh Thuy"

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  • Hình ảnh thu nhỏ
    Tài liệu
    Phthalates in indoor air and dust from Hanoi, Vietnam: distriution and human exposure
    (Nguyen Tat Thanh University, 2019) Tran, Minh Tri; Dang, Minh Huong Giang; Nguyen, Thi Thanh Huyen; Hoang, Quoc Anh; Vu, Duc Nam; Pham, Thi Phuong Thao; Le, Minh Thuy; Trinh, Thi Hue; Tu, Binh Minh
    Phthalates are a group of chemicals used as plasticizer additives in hundreds of products. Therefore, they were found in many different environmental and human matrices such as water, soil, sludge, air, dust, blood, and urine. This paper presents the determination method, occurrence and distribution of phthalates in indoor dust and indoor air samples collected in Hanoi, Vietnam. The optimal method has met the requirement to accurately identify phthalates in environmental samples. The highest concentrations of phthalates were measured in indoor dust samples and air collected at hair salons. The correlation of phthalates concentrations between indoor air and dust collected at hair salons were also higher than that in other micro-environments. Among the studied phthalates, di (2-ethylhexyl) phthalate (DEHP) was found at the highest concentrations in both dust and air samples. The exposure doses to phthalates through inhalation were ten times higher than other pathways such as dust ingestion. In general, the risk of human exposure doses to phthalates decreases with increasing ages.
  • Hình ảnh thu nhỏ
    Tài liệu
    Study on determination of PAEs in water samples by using solid phase extraction combined with gas chromatography-mass spectrometry
    (Nguyen Tat Thanh University, 2023) Tran, Manh Tri; Ta, Anh Ngoc; Le, Minh Thuy; Nguyen, Nu My Ha; Nguyen, Thi Thanh Huyen; Dang, Minh Huong Giang; Chu, Ngoc Chau
    Phthalic acid diesters (PAEs) are industrial chemicals used as plasticizers in a variety of commercial products. Due to wide usage, PAEs have been found in various environments and their human exposure risks have also attracted a lot of concerns. However, little information about the distributions of PAEs in the water samples collected from Vietnam was reported. In this study, the method for the determination of nine typical PAEs in water samples by using the solid phase extraction (SPE) combined with gas chromatography-mass spectrometry (GC-MS) technique was optimized. The method detection limits (MDLs) and method quantitation limits (MQLs) of PAEs in water samples were in ranges of 0.2–0.4 ng/L and (0.6-1.2) ng/L, respectively. The recoveries of surrogate compounds in blank and real samples ranged from (74.8 to 93.9) %, with RSD < 9.2 %. The calibration curve for all standards was linear over a concentration range of (1.0-1,000) ng/mL (with R2 ≥ 0.998). The total concentrations of PAEs measured in bottled water of six brands were ranged from 10.0 ng/L to 6,690 ng/L. Among the studied PAEs, di-(2-ethylhexyl) phthalate (DEHP) was found at the highest frequencies and concentrations. Overall, the distribution of PAEs in plastic bottled water is significantly lower than the permitted regulations (only with DEHP) in drinking water by the Ministry of Health of Vietnam in 2011.