| |
| Thesis Name： |
Spectrophotometric determination of trace selenium |
| Usage： |
Spectrophotometric determination of trace selenium |
| Keyword： |
123 |
| Remarks： |
A spectrophotometric method for the determination of selenium(IV) is described, based on the selenium-catalyzed oxidation of methyl orange with H2O2 in a nitric acid medium. As the redox reaction proceeds, the orange color of methyl orange is decolorized. The values of logA0/A show a good linear relationship with the amounts of selenium(here A0 and A stands for the absorbance of uncatalyzed reaction and catalyzed reaction, respectively ).The detection range is 18.8-65.7mg L-1 and the sensitivity is 0.876mg L-1.The method had been used to determine trace Se (IV) in high- Se tea with satisfactory results.
Keywords Catalytic kinetic spectrophotometry, Trace selenium, High-Se tea
Selenium is an essential trace element for animals and humans. It has wide biochemical and medical functions. There are many determination methods for selenium [1]. Spectrophotometric determination by catalytic kinetic method developed has been rapidly and used to analyze many kinds of elements [2,3]. But few methods have been reported for the determination of selenium [4-7].
This paper describes a new method for determination of Se(IV) based on its catalytic effects on the reduction reaction of methyl-orange with hydrogen peroxide in nitric acid medium. In addition, the mechanism of the catalytic reaction has been given.
|
| Original file： |
No File
|
|
Promulgator Detail |
| Full name: |
hichem |
| Country: |
CN |
| City: |
|
| Company Name: |
hichem |
| Homepage: |
http://www.teloon.com |
| E-mail: |
reply |
| Phone: |
86-411-82819585 |
| Fax: |
86-411-82819612 |
| Company Address: |
Renming Road, Dalian city, Lianning pro,china |
| Zip/Postal Code: |
|
| Introduction: |
|
|
|
|
|
