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Title: Extraction of chloroplatinate(II)– 2-[(5-bromo-2-pyridylazo)]-5-diethylaminophenol-(TX-100)-<i style="">N</i>-hydroxy-<i style="">N,N’</i>- diphenylbenzamidine complex
Authors: Khande, Pushpa
Thakur, Manisha
Deb, Manas Kanti
Keywords: 5-Br-PADAP
Platinum determination
Issue Date: Feb-2005
Publisher: CSIR
Series/Report no.: C 25 B 3/00
Abstract: A sensitive and selective spectrophotometric method, developed for the determination of trace amounts of platinum, is based on the formation of platinum as a mixed complex with 2-[(5-bromo-2-pyridylazo)]-5-diethylaminophenol (5-Br-PADAP) and TX-100 or triton X-100 (Polyethylene-di-isobutyl-glycol-ether) from 0.1M SnCl<sub>2</sub> in to HCl and extraction with <i style="">N</i>-hydroxy-<i style="">N,N</i>’-diphenylbenzamidine (HDPBA) in dichloromethane. The violet coloured Pt(II)- 5-Br-PADAP-(TX-100)–HDPBA complex in dichloromethane shows maximum absorbance at 575 nm with molar absorptivity value of 6.0x10<sup>4 </sup>dm<sup>3</sup>/mol/cm. The repeatability of the method was checked by finding relative standard deviation (RSD, n=10) value for solutions each containing 1.5 <img src='/image/spc_char/micro.gif'> g/cm<sup>2</sup> Pt(II) and the RSD value of the method was found to be 1.5%. The system obeyed Beer’s law up to 2.1 mg/cm<sup>2</sup> of platinum and the detection limit of the method is 20 ng/cm<sup>2</sup> on a three times the standard deviation of the blank absorbance basis. High concentration of foreign ions, with the exception of palladium, does not interfere with the determination of platinum. The proposed method has been applied for determination of platinum in automobile exhaust sample, soil and vegetation samples.
Description: 138-143
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Appears in Collections:JSIR Vol.64(02) [February 2005]

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