Polymetallic complexes in microemulsions for the hydrolysis of 4-nitrophenyl phosphate: a bio-mimetic model for decontamination of organophosphates in the environment

Fikru Tafesse; Ntsapokazi C Deppa

doi:10.1016/j.ecoenv.2003.07.003

Polymetallic complexes in microemulsions for the hydrolysis of 4-nitrophenyl phosphate: a bio-mimetic model for decontamination of organophosphates in the environment

Ecotoxicol Environ Saf. 2004 Jun;58(2):260-6. doi: 10.1016/j.ecoenv.2003.07.003.

Authors

Fikru Tafesse¹, Ntsapokazi C Deppa

Affiliation

¹ Chemistry Department, University of South Africa, P.O. Box 392, UNISA, Pretoria 0003, South Africa. tafesf@unisa.ac.za

PMID: 15157581
DOI: 10.1016/j.ecoenv.2003.07.003

Abstract

Reactions of several metal ions and polymetallic complexes toward hydrolysis of 4-nitrophenyl phosphate (NPP) were investigated at 10(-3)M concentration in oil-in-water microemulsions and aqueous media. The reactions were monitored by measuring the absorbance of the nitrophenolate ion produced in the reaction aliquots with time. The order of effectiveness of the metal ions and polymetallic complexes at neutral pH toward hydrolysis of NPP was found to be Turnbull's Blue>magnetite>Fe(III)>Fe(II)>Co(II)>Ca(II)>Cu(II). The possible application of these systems for sites contaminated with chemical warfare agents such as organophosphates is discussed.

Publication types

Comparative Study

MeSH terms

Calcium / chemistry
Cations
Decontamination / economics
Decontamination / methods*
Emulsions
Environmental Pollutants
Hydrolysis
Insecticides / chemistry*
Metals, Heavy / chemistry*
Molecular Structure
Nitrophenols / chemistry*
Organophosphorus Compounds / chemistry*

Substances

Cations
Emulsions
Environmental Pollutants
Insecticides
Metals, Heavy
Nitrophenols
Organophosphorus Compounds
nitrophenylphosphate
Calcium