Tên bài báo:
Nghiên cứu sự chuyển hóa các dạng asen và selen trong quá trình bảo quản, xử lý mẫu phân tích dạng bằng phương pháp HVG – AAS kết hợp với chomometrics- Tác giả:
- Phạm Hồng Chuyên
- Tham gia cùng:
- Tạp chí:
- Tạp chí Phân tích Hóa, Lý và Sinh học
- Năm xuất bản:
- 2015
- Trang:
- Từ trang 102 đến trang 108
- Lĩnh vực:
- Khoa học cơ bản
- Phạm vi:
- Trong nước
Tóm tắt:
It is very essensial for Chemical Speciation of elements to find out the suitable sampling, sample presevation and sample preparation methods so that there is no change in dominant forms and losing of analytes. This study concentrated on the effect of pH, contaner’s materials, present of iron(III) and dissolved oxygen in samples. The absorption of total ừace asenic and selenium on the surface of glass containers had been recognised if sample pH was above 6, concentration of Fe(III) was excess 200 ppb or samples were kept for a long time. The oxidizing process of As(III) to As(V), Se(IV) and SeMt to Se(VI) occured if oxygen was not removed. The determination of asenic and selenium species will be carried out with satisfied results in synthesis samples if the water samples are kept at pH around 2 using nitrogen for removing oxygen in Teflon container at 4°c within 48h of analyzing. The effect of Fe(III) in water sample was eliminated by using 0,2 M EDTA.
