Simultaneous Determination of Copper, Bismuth and Lead by Adsorptive Stripping Voltammetry in the Presence of Thymolphthalexone

Abstract

A novel, sensitive and selective adsorptive stripping procedure for simultaneous determination of copper, bismuth and lead is presented. The method is based on the adsorptive accumulation of thymolphthalexone (TPN) complexes of these elements onto a hanging mercury drop electrode, followed by reduction of adsorbed species by voltammetric scan using differential pulse modulation. The influences of control variables on the sensitivity of the proposed method for the simultaneous determination of copper, lead and bismuth were studied using the Derringer desirability function. The optimum analytical conditions were found to be TPN concentration of 4.0 μM, pH of 9.0, and accumulation potential at -800 mV vs. Ag/AgCl with an accumulation time of 80 s. The peak currents are proportional to the concentration of copper, bismuth and lead over the 0.4 -300, 1 -200 and 1 -100 ng mL -1 ranges with detection limits of 0.4, 0.8 and 0.7 ng mL -1 , respectively. The procedure was applied to the simultaneous determination of copper, bismuth and lead in the tap water and some synthetic samples with satisfactory results.

Studi Optimasi Penentuan Kadmium(ii) Secara Voltammetri Stripping Adsorptif

“…Dalam penentuan kadmium dengan metoda voltametri stripping adsorptif, ligan-ligan seperti PTT (5-phenyl 1,2,4-triazol 3-tion), TPN (thymolphtalexone), xylenol orange, dan DMTD (2,5-dimercapto 1,3,4 thiadiazole) telah dipelajari [9,10,11,12] . Pada percobaan kali ini, digunakan kalkon sebagai pengompleks untuk penentuan kadmium dengan metoda voltametri stripping adsorptif.…”

The Optimation Simultaneuos Determination of Lead(ii) and Cadmium(ii) by Adsorptive Stripping Voltammetry (Adsv)

“…Disamping itu, dengan metode ini dimungkinkan mempelajari spesi kimia dari logam berat [8] , yang tidak bisa dilakukan dengan metode lain. Metode ini bisa dilakukan untuk penentuan secara simultan Cu dan Pb dalam air laut dengan menggunakan kalkon sebagai pengompleks [9] , penentuan simultan Cu, Bi, dan Pb secara voltammetri stripping adsorptif dengan pengomplek thymolphthalexone [10] , dan penentuan simultan Ni dan Cd secara differensial pulse polarografi [11] . Toksisitas logam berat ditentukan dari spesi kimianya [3,12] .…”

THE METHOD DEVELOPMENT OF ANALYSIS Cd, Cu, Pb AND Zn IN SEA WATER BY ABSORPTIVE STRIPPING VOLTAMMETRY (ASV) IN THE PRESENCE OF CALCON AS COMPLEXING AGENT

“…The method of adsorptive stripping voltammetry is highly sensitive and selective so that it can be used to determine the species in solution at very small concentration [14], where Cr(VI) complexed with 2,2-bipyridine at 10 μM concentration, detection limit was 0.1692 μg/L at pH 5 [15]. The advantages of this method are: high salinity of sea water samples did not interfere in the determination, selective, fast, simple, low running costs and can for the simultaneous determination of copper, bismuth and lead in the presence of thymolphthalexone [16] and simultaneous determination of Traces of cadmium and zinc by using 5-phenyl-1,2,4-triazol-3-tion (PTT) as complexes agent [17].…”