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Showing 2 results for Box-Behnken
Gholamreza Bakhtiari, Ebrahim Alizadeh Doughikollaee, Mohsen Shahriari Moghadam, Mohsen Samimi,
Volume 29, Issue 6 (2-2021)
Abstract
The quality of fish flesh is affected by several factors including slaughtering methods and pre-slaughter conditions. In this study the effect of main operational variables such as fasting time (Xt), density (Xn) and fish weight (Xw) in the TBA value of common carp fillet has been evaluated and analyzed using the response surface method and Box-Behnken model. A numerical optimization model was performed to obtain the minimum amount of TBA in the fillets. Adapted fish treated by fasting time, density and weight and then harvested after 1, 4 and 7 days, slaughtered by smothering out of water and then fillet. The results showed that the lowest TBA value on the second-order model was obtained at low level of (Xn) (4 fish numbers), low level of (Xw) (500 g) and high levels of (Xt) (7 days fasting time). The optimal TBA value was determined 0.6842 by model which was measured 0.701 after the practical validation test in optimal condition which indicating the high accuracy of the model to determine the optimum pre-slaughter. Therefore, the results of this study showed that using the response surface method is appropriate to optimize pre-slaughter conditions of common carp and also the second-order model can be used to predict the response variable in difference conditions of pre-slaughter.
Maryam Rezaei, Nima Pourang, Ali Mashinchian Moradi,
Volume 31, Issue 2 (7-2022)
Abstract
Considering the importance of using biosorbents to remove metal ions from wastewater and aquatic ecosystems, in this study the potential of using scales of two fish species (rainbow trout; Oncorhynchus mykiss and Caspian kutum; Rutilus kutum) to reduce the concentration of lead in aquatic environments were evaluated based on Box-Behnken design. The effects of some important parameters (biosorbent dose, biosorbent size, contact time, temperature, initial concentration, pH and salinity) on the adsorption capacity of the biosorbents were also evaluated. Among the seven studied factors, the effect of initial concentration, pH and adsorbent dose on the concentration of lead adsorbed by the two adsorbents was significant (P<0.05), while temperature and adsorbent size had no significant effect on the adsorption of lead by the sorbents. The initial concentration was the most effective independent variable (with a positive effect). The maximum adsorption capacities of lead by the two adsorbents are comparable to those of other adsorbents of aquatic origin, evaluated by other researchers. The maximum adsorption capacity of lead by scales of rainbow trout was higher than Caspian kutum. The characteristics of the adsorbents before and after adsorption were analyzed by SEM, EDX, XRF and FTIR. The lead ion concentrations were measured using AAS. The SEM-EDX and XRF analyses clearly revealed the presence of lead ions on the surfaces of both biosorbents after the adsorption experiments. The FTIR results showed that the two sorbents are composed of different functional groups, which could possibly play a significant role in their lead uptake capacity.
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