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Title: Determination of free and total zinc using 2-[(5-bromo-2-pyridylazo)]- 5-diethylaminophenol in mixed surfactant medium
Authors: Banjare, Ravi Kumar
Thakur, Manisha
Deb, Manas Kanti
Issue Date: Apr-2005
Publisher: NISCAIR-CSIR, India
IPC Code: Int. C1.7: C07F3/06
Abstract: A simple and sensitive spectrophotometric method for chemical fractionation and determination of zinc in cosmetics and pharmaceuticals is described based on the formation or red coloured species of Zn(II) with 2-[(5-bromo-2-pyridylazo)]-5-diethylaminophenol (5-Br-PADAP) and mixed surfactants (TX-100 and Brij-35) in the pH range 8.2- 10.5. The red coloured Zn(II)-5-Br-PADAP-(TX-100+Brij-35) complex in aqueous medium shows maximum absorbance at 550 mm with molar absorptivity of 1.60105 dm3 mol-1  cm-l. The detection limit or the method is 6 ng  Zn(II)/cm2 and obeys Beer's law up to 0.4 µg Zn(II)/cm2 in aqueous phase. Relative standard deviation for ten determinations for solution containing 0.2 µg Zn(II)/cm2 is 1.5%. The validity of the method has been satisfactorily examined for the determination of zinc (free and total) in cosmetics and pharmaceutical formulating samples manufactured in India, with RSD value from actual analyte content ranging between 2.1 and 2.7% for cosmetics and between 1.9 and 2.8 % for pharmaceutical formulations.
Page(s): 733-736
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.44A(04) [April 2005]

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