A new chromogenic reagent, 1 -(5 - nitro- 3 - benzopsendothiazde)- 3 -(4 - phenylazophenyl) - triazene (NBPTPAPT) has been synthesized and used as a sensitive reagent for the spectrophotometric determination of ...A new chromogenic reagent, 1 -(5 - nitro- 3 - benzopsendothiazde)- 3 -(4 - phenylazophenyl) - triazene (NBPTPAPT) has been synthesized and used as a sensitive reagent for the spectrophotometric determination of cobalt. In the presence of Tween - 80, the reagent with Co ( Ⅱ ) forms a yellow complex (1 : 2) in the buffer solution of Na2B4O7 - NaOH at pH 10.54. The apparent molar absorptivity is 1.220× 10^5 L· mol^- 1· cm^- 1 with the linear range of 0 - 240μg/ L for Co (Ⅱ) by dual-wavelength spectrophotometry. Trace cobalt in vitamin B12 and tea samples has been determined with satisfactory results.展开更多
In the NaOH-NaCl-CH2(NH2)COOH medium,the reagent reacts with cethyltrimethylammonium bromide(CTMAB)and cteylpyrid-inium bromide(CPB)to form blue purple complex of component ratio 1∶2.The absorption maximum of t...In the NaOH-NaCl-CH2(NH2)COOH medium,the reagent reacts with cethyltrimethylammonium bromide(CTMAB)and cteylpyrid-inium bromide(CPB)to form blue purple complex of component ratio 1∶2.The absorption maximum of the complex is at 565nm.The range of Beer’s law to be obeyed,apparent molar absorptivity and critical micelle concentration of the cationic surfactants were determined,respectively.展开更多
基金Natural Science Foundation of Fujian Province (No.D0410027)
文摘A new chromogenic reagent, 1 -(5 - nitro- 3 - benzopsendothiazde)- 3 -(4 - phenylazophenyl) - triazene (NBPTPAPT) has been synthesized and used as a sensitive reagent for the spectrophotometric determination of cobalt. In the presence of Tween - 80, the reagent with Co ( Ⅱ ) forms a yellow complex (1 : 2) in the buffer solution of Na2B4O7 - NaOH at pH 10.54. The apparent molar absorptivity is 1.220× 10^5 L· mol^- 1· cm^- 1 with the linear range of 0 - 240μg/ L for Co (Ⅱ) by dual-wavelength spectrophotometry. Trace cobalt in vitamin B12 and tea samples has been determined with satisfactory results.
文摘In the NaOH-NaCl-CH2(NH2)COOH medium,the reagent reacts with cethyltrimethylammonium bromide(CTMAB)and cteylpyrid-inium bromide(CPB)to form blue purple complex of component ratio 1∶2.The absorption maximum of the complex is at 565nm.The range of Beer’s law to be obeyed,apparent molar absorptivity and critical micelle concentration of the cationic surfactants were determined,respectively.