In buffer solution of NaAc-HCl,when congo red(CGR) is mixed with the solution of cetylpyridinium bromide(CPB) after anion surfactant(AS) is added,the colour of the soluotion become deeper,and the max absorbtion wavele...In buffer solution of NaAc-HCl,when congo red(CGR) is mixed with the solution of cetylpyridinium bromide(CPB) after anion surfactant(AS) is added,the colour of the soluotion become deeper,and the max absorbtion wavelength is at 570 nm.At this wavelength,the absorbence enhancement is proportional to concentration of anion surfactant(AS).Based on it,a photometry method determining for anion surfactant was established.In the max absorbtion wavelength,anion surfactant(AS),namely,sodium lauryl sulfonate(SLS)and sodium dodecyl sulfate(SDS),in the 0～2.4×10-4 mol/L and 0～2.7×10-4 mol/L range obey Beer(s Law,and the apparent molar absorptivity(ε) of 1.28×104 L/(mol.cm) and 1.19×104 L/(mol.cm),the detection limit of 1.43×10-6 mol/L and 1.08×10-6 mol/L are obtained respectively.The proposed method has good sensitivity and better anti-jamming ability and has been applied to the determination of anionic surfactant(AS) in water samples with satisfactory results.展开更多
The diazo-coupling reactions of congo red with 8-hydroxyquinoline were studied.This new colour system has a maximum absorbance wavelength at 512nm.Beer’s law was obeyed in the range of 0.02～0.8mg/L for NO2-.The mola...The diazo-coupling reactions of congo red with 8-hydroxyquinoline were studied.This new colour system has a maximum absorbance wavelength at 512nm.Beer’s law was obeyed in the range of 0.02～0.8mg/L for NO2-.The molar absorptivity was 3.1×104L/mol·cm.The limit of quantitive determiation was 4.3×10-3mg/L.The method was applied to the determination of nitrite in waste water with satisfactory results.展开更多
文摘In buffer solution of NaAc-HCl,when congo red(CGR) is mixed with the solution of cetylpyridinium bromide(CPB) after anion surfactant(AS) is added,the colour of the soluotion become deeper,and the max absorbtion wavelength is at 570 nm.At this wavelength,the absorbence enhancement is proportional to concentration of anion surfactant(AS).Based on it,a photometry method determining for anion surfactant was established.In the max absorbtion wavelength,anion surfactant(AS),namely,sodium lauryl sulfonate(SLS)and sodium dodecyl sulfate(SDS),in the 0～2.4×10-4 mol/L and 0～2.7×10-4 mol/L range obey Beer(s Law,and the apparent molar absorptivity(ε) of 1.28×104 L/(mol.cm) and 1.19×104 L/(mol.cm),the detection limit of 1.43×10-6 mol/L and 1.08×10-6 mol/L are obtained respectively.The proposed method has good sensitivity and better anti-jamming ability and has been applied to the determination of anionic surfactant(AS) in water samples with satisfactory results.
文摘The diazo-coupling reactions of congo red with 8-hydroxyquinoline were studied.This new colour system has a maximum absorbance wavelength at 512nm.Beer’s law was obeyed in the range of 0.02～0.8mg/L for NO2-.The molar absorptivity was 3.1×104L/mol·cm.The limit of quantitive determiation was 4.3×10-3mg/L.The method was applied to the determination of nitrite in waste water with satisfactory results.
