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Speciation of Se(IV) in marine sediments using neutron activation analysis after co-precipitation with dibenzyldithiocarbamate (DBDTC) with phenolphthalein

Mohd. Yusof, Alias and Hanafiah, Z. and Wood, A. K. H. (1998) Speciation of Se(IV) in marine sediments using neutron activation analysis after co-precipitation with dibenzyldithiocarbamate (DBDTC) with phenolphthalein. Science of the Total Environment , 214 (1-3). pp. 247-252. ISSN 0048-9697

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Abstract

The determination of Se(IV) forms in marine sediments was performed on core samples taken from a fairly polluted environment. Sediment core samples were sliced into strata of between 2 and 3 cm thickness, dried at 60°C for 2 weeks and ground to<200 mesh size prior to the analysis. The powdered samples were dissolved by microwave digestion using a MDS-81D Microwave Digestion System. The quantitative determination of Se(IV) was done by co-precipitating the Se(IV) dibenzyldithiocarbamate complex with phenolphthalein (DBDTC-Pp) followed by irradiation of the Se(IV) forms in a neutron flux of 4×1012 neutrons cm-2 s-1 from a TRIGA Mk.II reactor at the Malaysian Institute of Nuclear Technology and Research (MINT). The Se(IV) species concentrations were calculated using the 136.0 keV ?-rays of the 75Se by the comparison method. Standard reference materials, such as SL-7 SRM supplied by IAEA was used to provide good quality assurance control. The results showed that the concentrations of Se(IV) in the sediment samples are between 3.93±0.05 ng g-1 and approximately 50.17±0.08 ng g-1. In general it was found that the distribution of Se(IV) concentrations along the South Johore coastal area showed some variations with locations and strata

Item Type:Article
Uncontrolled Keywords:Dibenzylthiocarbamate (DBDTC); Marine sediments; Speciation; Se(IV)
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:3028
Deposited By: Ms Zalinda Shuratman
Deposited On:18 May 2007 02:14
Last Modified:01 Jun 2010 03:06

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