The synthesis and analytical properties of 4,4'-bis(antipyrinyl-4-diazoamino)biphenyl (BAPDAB) were described for the first time. A catalytic kinetic method for thedetermination of silver was proposed. In the pres...The synthesis and analytical properties of 4,4'-bis(antipyrinyl-4-diazoamino)biphenyl (BAPDAB) were described for the first time. A catalytic kinetic method for thedetermination of silver was proposed. In the presence of Triton X-100 as a solubilizing agent and2,2'-dipyridyl as an activator, silver has a very strong catalytic effect on oxidative decolorationof BAPDAB by persulfate in acetic acid medium. The reaction was followed spectrophotometrically bymeasuring the decrease of absorbance of BAPDAB at 478 nm and 50 ℃. The calibration graphs are ofgood linearity in the range of 8.0 * 10^(-10)-1.0 * 10^(-6) mol/L by a fixed time method. The limitof detection is down to 5.0 * 10^(-10) mol/L. The catalytic reaction is pseudo-first-order withrespect to silver, which in real samples was determined with satisfactory results.展开更多
文摘The synthesis and analytical properties of 4,4'-bis(antipyrinyl-4-diazoamino)biphenyl (BAPDAB) were described for the first time. A catalytic kinetic method for thedetermination of silver was proposed. In the presence of Triton X-100 as a solubilizing agent and2,2'-dipyridyl as an activator, silver has a very strong catalytic effect on oxidative decolorationof BAPDAB by persulfate in acetic acid medium. The reaction was followed spectrophotometrically bymeasuring the decrease of absorbance of BAPDAB at 478 nm and 50 ℃. The calibration graphs are ofgood linearity in the range of 8.0 * 10^(-10)-1.0 * 10^(-6) mol/L by a fixed time method. The limitof detection is down to 5.0 * 10^(-10) mol/L. The catalytic reaction is pseudo-first-order withrespect to silver, which in real samples was determined with satisfactory results.
