Nghiên cứu phương pháp lấy mẫu bằng vật liệu cát phủ vàng và phân tích thủy ngân nguyên tố trong không khí bằng hệ thống hai bẫy vàng ghép nối đầu dò hấp thu nguyên tử=Sampling of atmospheric Hgo using home-made gold-coated sand sorbent prior to analysis by atomic absorption spectrometry

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Tác giả: Ánh Thùy Bùi, Huy Hoàng Đào, Thực Thái Huỳnh, Minh Trí Trương, Thiện Nguyễn Quang, Nhân Nguyễn Thành, Huỳnh Mai Lê Thị, Mỹ Nguyễn Thị, Thanh Ngọc Nguyễn Thị, Đông Nguyễn Văn

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Nguyễn Tất Thành, 2019

Mô tả vật lý: tr.13

Bộ sưu tập: Metadata

ID: 487280

Thêm vào giỏ

Gold-coated sand for amalgamation was synthesized and applied for the determination of mercury in ambient air using a home-made dual gold trap unit coupled to atomic absorption spectrometer. Gold-coated sand is prepared by chemical reduction of Au(III) solution with hydroxylamine depositing elemental gold on acid-etched sand. A home-made dual gold trap unit which focused time-resolved mercury trapped from the sampling/first trap provided an increase in sensitivity and reliability for the analysis of ultra-trace mercury in air was designed and tested. Instrumental detection and quantitation limits (IDL and IQL) of system were 3.9 and 13pg Hg, respectively. Method detection and quantitation limits (MLOD and MLOQ) of system were 0.04 and 0.13ngHg.m-3 for sampling flow rate of 200mL.min-1 and sampling time of 8 hours. Sampling system for gaseous elemental mercury was set up and cooperated with home-made desorption system were preliminarily applied for analysis of atmospheric mercury in samples collected at Hochiminh city University of Science. The atmospheric mercury concentrations were in range of 2.7 - 8.1ng Hg. m-3 which were comparable to Hg concentration found in other cities in the world.Trong nghiên cứu này, vàng được phủ lên bề mặt cát sau xử lí qua phản ứng khử Au(III) bằng dung dịch NH2OH và tính chất của vật liệu đã được kiểm tra trước khi sử dụng. Hệ thống hai bẫy cát phủ vàng ghép nối với đầu dò AAS được thiết kế và tối ưu nhằm hỗ trợ cho quá trình phân tích thủy ngân trong các mẫu thực tế có hàm lượng siêu vết (IDL và IQL của hệ thống lần lượt là 3.9 và 13 pg Hg). Hgo trong không khí được bắt giữ trên hệ thống lấy mẫu hai bẫy vàng liên tục trong 8h với tốc độ khí 200 mL.phút -1 sau đó hàm lượng Hg được phân tích trên hệ thống phân tích tại phòng thí nghiệm với MDL và MQL của phương pháp là 0.04 và 0.13 ngHg.m-3. Hệ lấy mẫu và phân tích tự thiết kế được sử dụng để xác định hàm lượng thủy ngân trong không khí tại hai điểm của trường Đại học Khoa học tự nhiên với hàm lượng đo được nằm trong khoảng 2.7 - 8.1 ngHg.m-3.

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