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NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.49A [2010] >
IJC-A Vol.49A(07) [July 2010] >
| Title: | Speciation of chromium in aqueous samples by solid phase extraction using multiwall carbon nanotubes impregnated with D2EHPA |
| Authors: | Vellaichamy, S
Palanivelu, K |
| Keywords: | Solid phase extraction
Speciation studies
Chromium
Carbon nanotubes
Nanotubes
ICP-AES |
| Issue Date: | Jul-2010 |
| Publisher: | CSIR |
| Abstract: | A
solid phase extraction system has been developed for the speciation of
chromium(III) and chromium(VI). This method is based on the adsorption of
chromium(III) on D2EHPA impregnated with multiwall carbon nanotubes and has
been compared with commercially available activated carbon impregnated with
D2EHPA. The chromium concentration has been determined by inductively coupled
plasma atomic emission spectroscopy. The effect of parameters such as pH
of the aqueous solution, amount of adsorbent, contact time, initial ion
concentration, sample volume, eluent type and D2EHPA concentration have been
investigated. The results indicate that the maximum adsorption of chromium(III)
is at pH 4.5 ± 0.1 on the multiwall carbon nanotubes. Desorption studies
have been carried out with 0.25 M Br2
in 1.0 M NaOH wherein quantitative
recovery of the chromium(III) has been observed. The adsorption capacity of
MWCNTs- D2EHPA is found to be 0.96 mg g -1 for chromium with
detection limit of chromium 0.05 mg mL-1. The highest pre-concentration factor of 60
could be obtained for 300 mL of sample volume.
The developed method has been applied for the speciation of chromium in
natural water sample and the pre-concentration method is satisfactory
(recoveries > 98 %, rsd < 10 %, n = 5) for chromium species
determination. |
| Page(s): | 882-890 |
| Source: | IJC-A Vol.49A(07) [July 2010]
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