| Abstract: | Abstract The reaction between lead(II) and 2-(2-Thiazolylazo)-p-Cresol(TAC) in the presence of TERGITOL NPX (4 mg/ml) at an apparent pH 9.0–10.0 results in an intensely colored complex which is stable for at least 4 hr. The composition of the complex is 1:2 cation: TAC and the log of the formation constant is 11.92 ± 0. 40. Beer's law is obeyed up to 6.0μg.ml?1 of lead(II) at 650nm. The apparent molar absorptivity at 650 nm is 2.07 × 104 1. mole?1.cm?1 and the detection limit was obtained as 10.0 ng.ml?1 of lead(II). The method is applied to determination of lead(II) in copper-base alloy. |
