The conditions of colour reaction of 2-(1,3,4-Triazolylazo)-5-Diethylamino-benzoic acid(TZDBA)with vanadium(V) are presented.The results show that the colour reagent reacts with vanadium,and forms a stable purple red ...The conditions of colour reaction of 2-(1,3,4-Triazolylazo)-5-Diethylamino-benzoic acid(TZDBA)with vanadium(V) are presented.The results show that the colour reagent reacts with vanadium,and forms a stable purple red complex in the medium of HCl with pH 2.0. The apparent molar absorptivity is 3 17×10 4L·mol -1 ·cm -1 ,and the maximum absorption wavelength is at 571 nm.Beer’s law is obeyed in the range of 0～20 μ g/25ml for V(V).The method has been used for the direct determination of vanadium in a aluminium alloy sample and a synthetic water sample with satisfactory results.展开更多
The interaction of O {2 [ α (2 hydroxy 5 sulphophenylazo)benzylidene]hydrazino}benzoic acid(ZCN) with cetyl trimethyl ammonium bromide(CTAB) was studied by UV spectra in pH=5 0 buffered solution. The results showed t...The interaction of O {2 [ α (2 hydroxy 5 sulphophenylazo)benzylidene]hydrazino}benzoic acid(ZCN) with cetyl trimethyl ammonium bromide(CTAB) was studied by UV spectra in pH=5 0 buffered solution. The results showed the complex has maximum absorption at 540 and 570 nm with an apparent molar absorptivity of 2 0×10 4 L/(mol·cm). Three constants were determined: binding constant K =2 3×10 5; degree of dissociation α =0 03 and binding number n (CTAB)∶ n (ZCN)=1∶2 5.展开更多
文摘The conditions of colour reaction of 2-(1,3,4-Triazolylazo)-5-Diethylamino-benzoic acid(TZDBA)with vanadium(V) are presented.The results show that the colour reagent reacts with vanadium,and forms a stable purple red complex in the medium of HCl with pH 2.0. The apparent molar absorptivity is 3 17×10 4L·mol -1 ·cm -1 ,and the maximum absorption wavelength is at 571 nm.Beer’s law is obeyed in the range of 0～20 μ g/25ml for V(V).The method has been used for the direct determination of vanadium in a aluminium alloy sample and a synthetic water sample with satisfactory results.
文摘The interaction of O {2 [ α (2 hydroxy 5 sulphophenylazo)benzylidene]hydrazino}benzoic acid(ZCN) with cetyl trimethyl ammonium bromide(CTAB) was studied by UV spectra in pH=5 0 buffered solution. The results showed the complex has maximum absorption at 540 and 570 nm with an apparent molar absorptivity of 2 0×10 4 L/(mol·cm). Three constants were determined: binding constant K =2 3×10 5; degree of dissociation α =0 03 and binding number n (CTAB)∶ n (ZCN)=1∶2 5.
