A COMPARISON OF BIOSORPTION CAPACITIES OF Cystoseira barbata AND Caulerpa racemosa USING Cd (II) AND Co (II) IONS

This study was conducted to compare the biosorption capacities of marine brown algae, Cystoseira barbata, and marine green algae, Caulerpa racemosa. These two algae were chemically modified by crosslinking with glutaraldehyde (GA), H3PO4, and HCl, or only washed with distilled water (DW) for use in equilibrium sorption uptake studies with Cd (II) and Co (II) ions. The pH level of the solution, contact time, initial metal concentration, mixed metal aqueous solution and desorption with different eluents were studied. A Langmuir and Freundlich isotherm analysis of the experimental data showed that the maximum metal uptake for two ions by algae were maintained when crosslinking with GA. The optimum pH value was 6 for C. barbata and 5 for C. racemosa. When the duration of the sorption process was 30 minutes, 0.1 M HCl and 0.1 M HNO3 were the most efficient eluents for these algae. FTIR and SEM analyses were performed as well. Results showed that C. barbata and C. racemosa have great potential for use as an eco-friendly agent in the process of removing Cd (II) and Co (II) ions for characterization of biomass

Temporal and spatial effects of environmental variables on crustacean communities in cardak Lagoon (Turkish Straits System) under the influence of domestic pollution

This study presents the temporal and spatial effects of domestic pollution on crustacean assemblages in a protected area, cardak Lagoon (Turkish Straits System). The samplings were performed from sandy and mud (silt + clay) bottoms between 1 and 1.8 m depths in October 2018, February, April, and June 2019. A total of 6920 specimens and 26 species (1 Isopoda, 1 Tanaidacea, 2 Mysidacea, 3 Cumacea, 5 Decapoda, 14 Amphipoda) belonging to crustaceans was found. Highest crustacea abundances were in autumn and winter. Considering the environmental variables, NO2 + NO3 (mg L- 1) and COD (mg L- 1) levels in the water had the highest correlations with abundance for the sampling periods. According to sampling points, the highest correlation value was found between anionic detergent content in the water and the abundance. Crustacean community structure was modified by environmental variables of anthropogenic origin at a higher level. Oxygen, oxygen reduction potential, NO2 + NO3, total nitrogen, chemical oxygen demand and anionic surfactant levels in water and sediment sand content % were major environmental variables affecting the crustacean abundance in the study area temporally.AcknowledgementsThis paper was prepared within the scope of the COST Action Project supported by TUBITAK coded 117Y510.TUBITAK [117Y510