Abstract A colour changeable optical sensing membrane was prepared for quantitative detection of Cd(II), Zn(II) and Cu(II) by using polyvinyl chloride membrane containing bis(2-ethylhexyl) phosphate for chemical absorption of chromogenic… Click to show full abstract
Abstract A colour changeable optical sensing membrane was prepared for quantitative detection of Cd(II), Zn(II) and Cu(II) by using polyvinyl chloride membrane containing bis(2-ethylhexyl) phosphate for chemical absorption of chromogenic reagent 1-(2-pyridylazo)-2-naphthol. Under the optimum conditions, the three ions were measured by UV-visible spectrophotometer at λmax=547, 554 and 560 nm, respectively. The linear ranges of 8.90×10-9-8.90×10-4 mol·L-1 [Cd(II)], 1.78×10-9-1.78×10-4 mol·L-1 [Zn(II)] and 1.78×10-7-1.78×10-3 mol·L-1 [Cu(II)] and detection limits of 3.89×10-9, 3.42×10-10 and 1.20×10-7 mol·L-1 were obtained, respectively. The response time was between 7-15 min. For common anions and cations, the sensing membrane exhibited good selectivity. Selective determination of Cd(II), Zn(II) and Cu(II) was achieved by adding a suitable masking agent. The sensing membrane was regenerated by soaking in nitric acid for 1-3 min and maintained a stable response after three times of reuse. The sensing membrane was successfully used for the determination of Cd(II), Zn(II) and Cu(II) in real samples.
               
Click one of the above tabs to view related content.