Duyệt theo Tác giả "Tu, Binh Minh"

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  • Hình ảnh thu nhỏ
    Tài liệu
    Application of Raman spectroscopy in relative blue ballpoint pen ink dating for forensic document analysis – a case report
    (Nguyen Tat Thanh University, 2023) Hoang, Anh Duc; Hoang, Manh Hung; Tu, Binh Minh
    In this case report, blue ballpoint ink on a questioned document was investigated using a newly developed Raman model devoted for dating of documents via writing inks. The majority of blue ballpoint pen inks contain crystal violet - a triarylmethane dye which displays a typical “molecular fingerprint” type of Raman spectrum, of which most intense peaks at 749 cm−1 and 1542 cm−1 (under 785 nm laser excitation) represents the least and the most stable bonds of crystal violet molecules, respectively. The ratios of peak intensities at above mentioned Raman shifts are utilized to estimate the relative dating of the questioned blue ballpoint pen ink in practice, results of which agreed with estimations using other traditional relative dating methods.
  • 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.