A NEW SYSTEM FOR THE DETERMINATION OF SELENIUM USING SPECTROPHOTOMETRY

作者：Narayana B^*; Veena K

来源：Oxidation Communications, 2013, 36(3): 691-701.

• 4-hydrazinyl-8-(trifluoromethyl) quinoline
• 4-chloro-2-nitrophenol
• chloroacetyl catechol
• resorcinol
• spectrophotometry

A simple, rapid, selective and sensitive method is described for the spectrophotometric determination of selenium. The method is based on the oxidation of 4-hydrazinyl-8-(trifluoromethyl) quinoline (HTQ) and coupling reaction. Selenium oxidises 4-hydrazinyl-8-(trifluoromethyl) quinoline to its diazonium salt. The diazonium salt is then coupled with 4-chloro-2-nitrophenol (CNP) or chloroacetyl catechol (CAC) or resorcinol (R_ES) to form corresponding azo dye. The Beer law is obeyed in the concentration range of 5.00-13.00 mu g ml(-1) of selenium for HTQ CNP system, 1.00-7.00 mu g ml(-1) of selenium for HTQ CAC system and 0.60-2.00 mu g ml(-1) of selenium for HTQ RES system. Molar absorptivity and the Sandell sensitivity for each system were calculated. The method has been applied to the determination of selenium in water samples, soil samples and plant material.

• 出版日期2013