Determination of lead (II) in some water sample collected from Kamal Pokhari of Kathmandu using dithizone ligand
Dr. Surendra Prasad Singh
The Kathmandu Valley historically known as Nepal Valley lies at the crossroads of ancient civilizations of the Indian subcontinent and the broader Asian continent, and has at least 130 important monuments, including several pilgrimage sites for Hindus and Buddhists. There are seven World Heritage Sites within the valley. Kamal Pokhari is a gorgeous pond situated in the Hattisar region of Kathmandu, Nepal. Lead is a toxic element that can be found throughout our environment. It used to be an ingredient in gasoline and paint, though both uses were banned many years ago. Experts consider lead so toxic that there is no safe level of exposure. Thus a very simple, ultra-sensitive and fairly selective non-extractive spectrophotometric method is presented for the rapid determination of lead (II) at ultra-trace level using dithizone (1, 5-diphenylthiocarbazone) as a new spectrophotometric reagent (λmax = 490 nm) in a slightly acidic (0.07-0.17 M H2SO4) aqueous solution. The average molar absorption coefficient was found to be 3.99×105 L mol–1 cm–1 and Sandell’s sensitivity was 30ng cm–2 of Pb. The method was successfully applied to a number of collected water samples from Kamal Pokhari contained lead (II).The method has high precision and accuracy (σ =±0.01 for 0.5 mg L–1).
Dr. Surendra Prasad Singh. Determination of lead (II) in some water sample collected from Kamal Pokhari of Kathmandu using dithizone ligand. International Journal of Chemical Science, Volume 1, Issue 2, 2017, Pages 117-120