β Scribed by O. Aboul Dahab
No coin nor oath required. For personal study only.
The present study focusses on the spatial distribution and chemical speciation of organotin compounds in Alexandria coastal belt sediments. Surface sediments were collected by a Van Veen Grab, and analyzed by HDAAS for tributyl-, dibutyl-, monobutyl-, trimethyl-, dimethyl-, monomethyl-tins, and inorganic tin. The concentrations (as Sn) ranged from undetectable to 1200 ng g-1 dw (dry weight) for mono-methyltin (31 from 35 samples), undectable to 135 ng g-1 dw for dimethyltin (29 from 35 samples), undetectable to 80 ng g-1 dw for trimethyltin (6 from 35 samples), undetectable to 450 ng g-1 dw for monobutyltin (34 from 35 samples), undetectable to 425 ng g-~ dw for dibutyltin (29 from 35 samples) and 30 to 1375 ng g-1 dw for tributyltin (in allsamples). Methyl-and butyltin compounds are omnipresent in Alexandria coastal sediments. Methyltin compounds appear to form within the environment by debutylation of tributyltin, and butyltin compounds are derived from anthropogenic sources. No significant correlations were found between organic C (0.3 to 13.4%) and the alkyltin species concentrations.
π SIMILAR VOLUMES
Speciation of trace metals in sediments M. KERSTEN 11.1 calibration curve proved to reproduce known Cr III /Cr VI ratios of pure Cr 2 O 3 and Na 2 CrO 4 ΠΈ H 2 O mixtures with an accuracy of 3%. It can also be used to estimate Cr VI /total Cr content, e.g. in contaminated soils with chromium levels a
The speciation of several tributyltin (TBT) compounds used in marine antifouling paints was studied by tin M0ssbauer spectroscopy in both spiked anoxic and oxic estuarine sediments. These compounds included TBT acetate, chloride, fluoride, and oxide. To assist in the determination of the products, p