Abstract. Hedayati A, Darabitabar F, Ahmadvand S, Ahmadvand S. 2017. Short Communication: Acute toxicity effects of titanium nano particle TiO2 NPs on hematological indices in Goldfish (Carassius auratus, Linnaeus 1758). Nusantara Bioscience 9: 152-155. Metal nanoparticles which include particles manufactured from metal oxides such as zinc oxide ZnO and titanium oxide TiO 2 particles are broadly used due to their inimitable attributes such as diversity level chemistries and can be prepared into a variety of figures and sizes. The aim of this study was to investigate the effect of different TiO 2 NPs concentrations on hematology indices in Goldfish (Carassius auratus). 105 goldfish with average total lengths of 6.50 ± 0.43 cm were used in this present study. Goldfish were exposed to a lethal concentration of 50% LC 50 nano-titanium dioxide for a period of 0 (control), 24, 48 and 96h static toxicity examination, presented in tanks of 60L. The results of this study shows LC50 96h nano titanium dioxide for goldfish is 19985±2.27 ppm and MAC value or the maximum allowable concentration calculated for this toxin is 1998 mg/L. No mortality observed in the control group. Fish exposed to nano-titanium dioxide for 7 days, a significant change in hematological (Hb, MCH, MCHC, MCV, RBC), and immunological (WBC) indices concentrations toward the control groups (p<0/05). The results of this study showed, however, LC 50 of nano titanium dioxide was very high that means it doesn't have much mortality effect, but it has negative effect on blood indices in goldfish and reduces red blood cells and hemoglobin in fish, eventually caused the death of fish.
In this study, the mortality effects of commercial gasoline at different tested concentrations were evaluated on the common roach (Rutilus caspicus) and LC50 values for each time period (24, 48, 72, and 96 hours) have been determined. Roach with an average weight of 3.1 ± 0.45 g and lengths of 4 ± 0.25 cm were used in this study. After transferring the 200 fish to the laboratory, they were kept in tanks of 100 liters for one week to adapt them to the experimental conditions. After the adaptation period, 100 fish were selected randomly and divided into 14 treatments (0, 2, 5, 10, 20, 40, 60, 80, 100, 200, 400, 600, 800, and 100 ppm commercial gasoline).The treatments were completed in triplicate. The results of this study show that the 96-hour LC50 of commercial gasoline is 600.2 ± 0.44 ppm and the maximum allowable concentration (MAC) is 60.02 mg/L. The study demonstrates the deadly effects of commercial gasoline on the Caspian roach. Spillage of diesel and gasoline fuels from transport tankers can enter rivers and eventually the marine ecosystem, and reach nursery and spawning areas where it can become a serious threat to fish survival.
Natural hydrogels have replaced synthetic hydrogels due to their properties such as long life, high water absorption capacity, high strength and resistance. Recently, hydrogels have been de ned as two-or multicomponent systems consisting of three-dimensional networks of polymer chains that ll the space between macromolecules, and the e ciency of their water absorption depends on the polymeric nature and density of the polymer network connections. Due to climate change and frequent droughts, supply of fresh water has become one of the major barriers of sustainable aquaculture development in Iran. Therefore, wastewater treatment and reuse can be a suitable solution to meet the water requirement of expanding aquaculture industry. The purpose of the present study is to assess the e ciency of a new hydrogel prepared from agricultural waste (bagasse) in removal of nitrogen and phosphate compounds from the e uent of sh farms. First, the hydrogel was prepared during the polymerization process and then, in order to determine the optimal adsorption, it was tested in a discontinuous system by performing adsorption isotherm calculations. In cellulose/chitosan nanocrystalline hydrogel nanosorbent, the removal rates for nitrate, nitrite and phosphate were 84.3, 86 and 90.9%, respectively.Optimal adsorption were determined at acidity 6, time 30 minutes, temperature 40 ° C, concentration 100 mg / l and adsorbent weight 0.5 g. Comparison of adsorption isotherm models showed more conformity with Freundlich and Tamkin absorption models with correlation coe cients of 0.99 and 0.97 for nitrate, 0.98 and 0.91 for nitrite and 0.99 and 0.93 for phosphate, respectively.
HighlightsNew methods in the manufacture and preparation of nanosorbents were used Nanosorbents in wastewater treatment bioreactors and their wash ability without deformation were used It showed lower adsorbent and shorter duration compared to other adsorbents produced Simple use of herbal nanosorbents for sh farms was con rmed High ability of nanosorbents produced in the removal of nitrogen and phosphate compounds
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