NOPR Collection:

Chelation technique for the removal of heavy metals (As, Pb, Cd and Ni ) from green mussel, Perna viridis

Sat, 01 Mar 2014 00:00:00 GMT

Title: Chelation technique for the removal of heavy metals (As, Pb, Cd and Ni ) from green mussel, Perna viridis Authors: Azelee, I Wan; Ismail, R; Ali, R; Bakar, W A W A Abu Abstract: Present research was carried out to study the efficiency of chelation method to remove heavy metals like arsenic (As), lead (Pb), cadmium (Cd) and nickel (Ni) from P. viridis. Chelation method was studied using three types of chelating agents, namely trisodium citrate, disodium oxalate and sodium acetate_. Metals concentrations were analysed using ICP-MS technique. Results showed that the sodium acetate gave the highest percentage removal of heavy metals (As 59.50%, Pb 88.57%, Cd 68.01% and Ni 79.67%) followed by disodium oxalate (As 46.89%, Pb 85.46%, Cd 60.41% and Ni 47.80%) and trisodium citrate (As 38.13%, Pb 68.90%, Cd 70.49% and Ni 36.92%). The findings showed that sodium acetate was able to chelate and remove all the studied heavy metals to levels below the permissible limit set forth by Malaysian Food Regulations (1985) and EU Commission Regulation (2006). Page(s): 372-376

Dinoflagellate [cyst] [S1] as signals for eutrophication in the eastern harbour of Alexandria-Egypt

Sat, 01 Mar 2014 00:00:00 GMT

Title: Dinoflagellate [cyst] [S1] as signals for eutrophication in the eastern harbour of Alexandria-Egypt Authors: Ismael, A; El-Masry, E; Khadr, A Abstract: Present study provides information about the cyst assemblages as an indication of eutrophication in the harbour. Two sediment core samples were collected from the Eastern Harbour during 2008. Fifteen genera with 26 species were identified from the two cores with total cyst abundance ranging from 138 to 1296 cysts [g-1] [s2] dry wt. Protoperidinium spp. cysts contributed a maximum of 43% to the total cysts, followed by Alexandrium spp. 21% and Diplopsalis cysts with 13%. During this study, six cyst genera with thirteen heterotrophic dinoflagellate species were identified with cyst concentration ranging from 12 to 820 cyst [g-1] [s3] dry wt. Total heterotrophic cyst showed a significant positive correlation with diatoms, sedimentary TP and TN, indicating that increase in diatoms and nutrient concentrations are the main cause of heterotrophic dinoflagellate. Page(s): 365-371

Distribution of phytoplankton along an environmental gradient off Kakinada, East Coast of India

Sat, 01 Mar 2014 00:00:00 GMT

Title: Distribution of phytoplankton along an environmental gradient off Kakinada, East Coast of India Authors: Ayajuddin, M.; Pandiyarajan, R. S.; Ansari, Z. A. Abstract: In the present study phytoplankton distribution and species composition was examined on a salinity gradient from River (R), River Mouth (RM) and coastal water (RF) at surface and subsurface layers along the coast off Kakinada, East Coast of India. Average numerical abundance of phytoplankton at R, RM and RF are 336 nos.mL^-1, 150 nos.mL^-1 and 169 nos.mL^-1respectively. Percentage contribution of each group of phytoplankton was in the order: Pinnate diatoms > Cyanophyceans > Centrales > Prasinophyceans. However, total phytoplankton species at surface and subsurface water at all the stations showed presence of 52 and 24 species respectively. At the group level, cyanophyceans were significant at RF locations. Pennate diatoms were more at the remaining locations. Species Oscillatoria limosa was found to be abundant at both the surface and subsurface water with 340 filaments.ml^-1and 488 filaments.mL^-1 recpectively. Thalassiothrix longissima was found to be maximum at surface water but absent in subsurface water. Wide variation in evenness values (0.16-0.910) suggests uneven distribution of species along the environmental gradient. Page(s): 357-364

Distribution, abundance and diversity of phytoplankton in the inshore waters of Nizampatnam, South East coast of India

Sat, 01 Mar 2014 00:00:00 GMT

Title: Distribution, abundance and diversity of phytoplankton in the inshore waters of Nizampatnam, South East coast of India Authors: Pandiyarajan, R S; Shenai-Tirodkar, Prachi S; Ayajuddin, M; Ansari, Z A Abstract: Distribution, abundance and species assemblages of Phytoplankton were studied from inshore waters of Nizampatnam, South East coast of India in March 2007. Significant spatial variations in temperature, pH, salinity, dissolved oxygen (DO), nitrites (NO₂) –N), nitrates (NO₃) – N), phosphate (PO₄)–P), silicate (SiO₄) – (Si) were monitored. A total of 90 species of phytoplankton (net hauls) represented by 5 groups were identified at nine stations, collected along three transects during low tide. Percentage contribution of each group of phytoplankton was in the order: Bacillariophyceans > Dinophyceans > Cyanophyceans > Euglenophyceans. Pleurosigma angulatum, Navicula sp. were dominant species in the study area. Bray - Curtis similarity and group average clustering, recommended identifying two assemblages of phytoplankton in the study area. High diversity of phytoplankton in the present area suggests stable environmental conditions. Page(s): 348-356