Document Detail

Spectrophotometric detection of pentachlorophenol (PCP) in water using immobilized and water-soluble porphyrins.
MedLine Citation:
PMID:  15626614     Owner:  NLM     Status:  MEDLINE    
The spectrophotometric properties of porphyrins are altered upon interaction with chlorophenols and other organochlorine pollutants. Meso-tetra(4-sulfonatophenyl)porphyrin (TPPS), zinc meso-tetra(4-sulfonato phenyl)porphyrin (Zn-TPPS), monosulfonate-tetraphenylporphyrin (TPPS1), meso-tri(4-sulfonatophenyl)mono(4-carboxyphenyl)porphyrin (C1TPP), meso-tetra(4-carboxyphenyl)porphyrin (C4TPP), and copper meso-tetra(4-carboxyphenyl)porphyrin (Cu-C4TPP) in solution exhibit a broad absorbance in the range 400-450 nm Soret region. The interaction of the above mentioned porphyrins in solution with pentachlorophenol (PCP) induces a red shift in the Soret spectrum with absorbance losses at 413, 418, 403, 405, 407, and 404 nm, respectively, and the appearance of new peaks at 421, 427, 431, 416, 417, and 416 nm, respectively. The intensity of the Soret spectral change is proportional to the pentachlorophenol concentration with a detection limit of 1, 0.5, 1.16, 1, 0.5, and 0.5 ppb, respectively. The interaction of (C4TPP) and (Cu-C4TPP) in solution with PCP shows to concentration dependent for concentrations less than 4 ppb the dependence was log-linear. However, for concentrations greater than 4 ppb the relation was linear. Monosulfonate-tetraphenylporphyrin immobilized as a monolayer on a Kimwipe tissue exhibits an absorbance peak in the Soret region at 422 nm. The interaction of the porphyrin with PCP induces a red shift in the Soret spectrum with absorbance loss at 419 nm and the appearance of new peaks at 446 nm. The intensity of the Soret spectral change is proportional to the log of PCP concentration. The detection limit with immobilized TPPS1 for PCP is 0.5 ppb. These results suggest the potential for development of spectrophotometric chemosensor for PCP residues in water with detection limits less than US EPA maximum contaminate level (MCL) of 1 ppb. The immobilized TPPS1 on the Kimwipe will make it possible to develop a wiping sensors to monitor the PCP or other pesticides residues on the vegetables or wood products.
A Mufeed Awawdeh; H James Harmon
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article    
Journal Detail:
Title:  Biosensors & bioelectronics     Volume:  20     ISSN:  0956-5663     ISO Abbreviation:  Biosens Bioelectron     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2004-12-31     Completed Date:  2005-06-09     Revised Date:  2009-07-14    
Medline Journal Info:
Nlm Unique ID:  9001289     Medline TA:  Biosens Bioelectron     Country:  England    
Other Details:
Languages:  eng     Pagination:  1595-601     Citation Subset:  IM    
Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA.
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MeSH Terms
Environmental Monitoring / methods
Pentachlorophenol / analysis*,  chemistry*
Porphyrins / analysis*,  chemistry*
Reproducibility of Results
Sensitivity and Specificity
Spectrophotometry / methods*
Water / analysis,  chemistry*
Water Pollutants, Chemical / analysis*
Reg. No./Substance:
0/Porphyrins; 0/Solutions; 0/Water Pollutants, Chemical; 7732-18-5/Water; 87-86-5/Pentachlorophenol

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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