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Study on the spectrophotometric determination of Cadmium by Cd(II)-5-Br-PADAP-OP system

Lin Fang

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Abstract

The condition of colour reaction of Cadmium(Ⅱ) with 2-[(5-bromo-2-pyridyl)azo]-5-diethylaminophenol(5-Br-PADAP)in the presence of Surfactant has been studied.The Cadmium(Ⅱ) can react with 5-Br-PADAP to form 1∶2 red complex in the NH 3·H 2O-NH 4Cl buffer solution (pH8.0) containing OP.The colour reaction can be accomplished in wide range of temperature and the colour is stable for at least 20 h.Complex has a maximum absorption wavelength at 560 nm.The apparent molar absorptivity is 3.51×10 5 L·mol -1 ·cm -1 .Beer's law is obeyed in the range from 0 to 400 μg/L for Cadmium(Ⅱ).This method possesses advantages of high sensitivity and good repeatability.It is applied to the determination of trace Cadmium in lead slag with satisfactory results.1fig.,2tabs.,5refs.

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The condition of colour reaction of Cadmium(Ⅱ) with 2-[(5-bromo-2-pyridyl)azo]-5-diethylaminophenol(5-Br-PADAP)in the presence of Surfactant has been studied.The Cadmium(Ⅱ) can react with 5-Br-PADAP to form 1∶2 red complex in the NH 3·H 2O-NH 4Cl buffer solution (pH8.0) containing OP.The colour reaction can be accomplished in wide range of temperature and the colour is stable for at least 20 h.Complex has a maximum absorption wavelength at 560 nm.The apparent molar absorptivity is 3.51×10 5 L·mol -1 ·cm -1 .Beer's law is obeyed in the range from 0 to 400 μg/L for Cadmium(Ⅱ).This method possesses advantages of high sensitivity and good repeatability.It is applied to the determination of trace Cadmium in lead slag with satisfactory results.1fig.,2tabs.,5refs.

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Available abstract

The condition of colour reaction of Cadmium(Ⅱ) with 2-[(5-bromo-2-pyridyl)azo]-5-diethylaminophenol(5-Br-PADAP)in the presence of Surfactant has been studied.The Cadmium(Ⅱ) can react with 5-Br-PADAP to form 1∶2 red complex in the NH 3·H 2O-NH 4Cl buffer solution (pH8.0) containing OP.The colour reaction can be accomplished in wide range of temperature and the colour is stable for at least 20 h.Complex has a maximum absorption wavelength at 560 nm.The apparent molar absorptivity is 3.51×10 5 L·mol -1 ·cm -1 .Beer's law is obeyed in the range from 0 to 400 μg/L for Cadmium(Ⅱ).This method possesses advantages of high sensitivity and good repeatability.It is applied to the determination of trace Cadmium in lead slag with satisfactory results.1fig.,2tabs.,5refs.

Key concepts: Molar absorptivity, Cadmium, Chemistry, Color reaction, Buffer solution, Absorption (acoustics), Repeatability, Spectrophotometry

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