Abstract-Some residual clay soils from southwestern Nigeria have been investigated with a view to elucidating their geotechnical properties and determine the possible variations in these properties in relation to the sampling distance. Eight bulk residual soil samples from two test pits separated 30m apart at intervals of 0.5m up to a depth of 2.0m were analyzed in the laboratory to determine specific gravity, grain size distribution, consistency limits, linear shrinkage, unconfined compressive strength and compaction characteristics. The data generated were subsequently subjected to statistical analysis. The investigations revealed that the soils are generally well graded, inorganic, with medium to high plasticity and hence compressibility and are of the same geologic origin. Statistical T-test showed no significant difference exists between the soils in terms of specific gravity, liquid limit, plastic limit, plasticity index, linear shrinkage, % clay size fraction, amount of fines, unconfined compressive strength and optimum moisture content. However the maximum dry density of the soils from both pits differed significantly. Although most of the parameters examined are not as varied and showed insignificant difference, the equations generated provide an option in the estimation of properties considering the close sampling distance.
Automated synthesis of [ 18 F]ciprofloxacin in a TRACERlab TM FX FDG (GE Healthcare) synthesis module was developed. Dependence of radiochemical yield on reactor type was observed. 3-mL V-shaped borosilicate glass reactor gave higher radiochemical yield as compared with standard 15-mL glassy carbon reactor. V-shaped borosilicate glass reactor might also give higher radiochemical yield for other [ 18 F]radiotracers than [ 18 F]ciprofloxacin.
a b s t r a c tWe transferred the previously published manual synthesis of [ 18 F]ciprofloxacin (decay-corrected RCY: 5.5 71.0%) to an automated synthesis module (TRACERlab TM FX FDG , GE Healthcare) and observed a strong decrease in RCY (0.4 70.4%). When replacing the standard 15-mL glassy carbon reactor of the synthesis module with a 3-mL V-shaped borosilicate glass reactor a considerable improvement in RCY was observed. [ 18 F]Ciprofloxacin was obtained in a RCY of 2.7 71.4% (n ¼23) with a specific activity at EOS of 1.47 0.5 GBq/mmol in a synthesis time of 160 min.
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