Selective determination of selenium(IV) from environmental samples by UV-visible spectrophotometry using O-methoxyphenyl thiourea as a chelating ligand

Title
Selective determination of selenium(IV) from environmental samples by UV-visible spectrophotometry using O-methoxyphenyl thiourea as a chelating ligand
Authors
한성환
Keywords
O-methoxyphenyl thiourea; pharmaceutical samples; environmental samples; selenium; solvent extraction; spectrophotometry
Issue Date
2015-07
Publisher
TAYLOR & FRANCIS LTD
Citation
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY, v. 95, NO 7, Page. 618-634
Abstract
A selective extraction-spectrophotometric method has been developed for determination of selenium(IV) using O-methoxyphenyl thiourea (OMePT) as a chelating agent. The basis of the proposed method is the spectrophotometric determination of selenium(IV)-OMePT complex obtained after extraction of selenium(IV) from 3.5M hydrochloric acid media using OMePT in chloroform solvent. The complex shows maximum absorbance at 350nm against the reagent blank. The Beer's law was obeyed over the concentration range 5-60 mu gmL(-1) of selenium(IV). The optimum concentration range was 20-50 mu gmL(-1) as evaluated from Ringbom's plot. The molar absorptivity and Sandell's sensitivity of the selenium(IV)-OMePT complex in chloroform were 3.312x10(2) Lmol(-1)cm(-1) and 0.2384 mu gcm(-2), respectively. The composition of selenium(IV)-OMePT complex was 1:2 established from slope ratio method, mole ratio method and Job's continuous variation method. The complex was stable for more than 72h. The interfering effect of various foreign ions was studied and suitable masking agents were used wherever necessary to enhance the selectivity of the developed method. The proposed method was successfully applied for the determination of selenium(IV) from real samples, viz. pharmaceutical formulations, shampoo, vegetable sample, synthetic mixtures and environmental samples. Repetition of the method was checked by finding the relative standard deviation (RSD) for 10 determinations which was 0.35%.
URI
http://www.tandfonline.com/doi/abs/10.1080/03067319.2015.1046057http://hdl.handle.net/20.500.11754/26321
ISSN
0306-7319; 1029-0397
DOI
http://dx.doi.org/10.1080/03067319.2015.1046057
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE