Listeria spp. in the coastal environment of the Aqaba Gulf, Suez Gulf and the Red Sea

Listeria monocytogenes is an important pathogen which causes an infection called listeriosis. Because of the high mortality rate (~30%) associated with listeriosis, and the widespread nature of the organism, it is a major concern for food and water microbiologists since it has been isolated from various types of foods, including seafood, as well as from the aqueous environment. To investigate the prevalence of this pathogen in the Aqaba Gulf (12 sites), Suez Gulf (14 sites) and Red Sea (14 sites), 200 water samples (collected during five sampling cruises in 2004), 40 fresh fish samples and 15 shellfish samples were analysed using the enrichment procedure and selective agar medium. All water samples were also examined for the presence Listeria innocua which was the most common of the Listeria spp. isolated, followed by L. monocytogenes, with a low incidence of the other species. During the whole year, the percentage of Listeria spp. and L. monocytogenes in 200 water samples was 20·5% (41 samples) and 13% (26 samples) respectively. In fresh fish (40 samples) it was 37% (15 samples) and 17·3% (7 samples) and in shellfish (15 samples) 53% (8 samples) and 33% (5 samples) respectively. In water samples, there was an association between the faecal contamination parameters and the presence of the pathogen; however, water salinity, temperature, dissolved oxygen and pH did not influence the occurrence of this bacterium. These results may help in the water-quality evaluation of the coastal environments of these regions.

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Comparative assessment of TPHs and bioaccumulation in some fresh fish species in the Qua lbeo River of Eket of Akwa lbom State in Nigeria

Bangladesh Journal of Scientific and Industrial Research ◽

10.3329/bjsir.v51i2.28112 ◽

2016 ◽

Vol 51 (2) ◽

pp. 147-154

Author(s):

VE Okpashi ◽

VN Ogugua ◽

INE Onwurah ◽

CS Ubani ◽

TC Ezike

Keyword(s):

Fish Species ◽

Water Samples ◽

Clarias Gariepinus ◽

Bioaccumulation Factor ◽

Red Snapper ◽

Molecular Formula ◽

Aquatic Animal ◽

River Bank ◽

Fresh Fish ◽

Fish Samples

This investigation was carried out in four different locations mapped out along the river bank. Twelve water samples were collected and six different fresh fish species that are frequently consumed were caught. They include: African red snapper (Lutjanus agennes), Yellow tail (Seriola lalandi), Barracuda (Sphyraena barracuda), Atlantic Croker (Micropogonias undulates), Catfish (Clarias gariepinus) and Tilapia (Oreochromis niloticus). Samples were subjected to screening using gas chromatography and flame ionization detector instrument. Results revealed presence of total petroleum hydrocarbon (TPH) contaminant in all the fish samples and varies with species significantly at p >0.05. The profound TPH compound is Nonane with molecular formula C9H20. 9 x 10-9 mg/l was adapted as Nonane concentration in water samples. Nonane concentration in fish samples showed African red snapper 3.9565±4.64648 mg/l, Yellow tail 8.7243±2.15546 mg/l, Barracuda 6.2555±0.48889 mg/l, Atlantic Croker 9.3866±0.42208 mg/l, Catfish 4.1973±1.52959 mg/l and Tilapia 6.0039±0.96487 mg/l respectively. The bioaccumulation factor varies in fish species, where the Yellow tail have higher bioaccumulation factor 969,369061, followed by Barracuda 695,067209, Tilapia 667,101072, Catfish 466,368366, African red Sniper 439,616275 and Crocker fish 104,2956024 respectively. This investigation reveal considerably the extent of bioaccumulation of TPH contaminants in aquatic animal models and making unsafe for consumption as some fishes bio-accumulate nonane beyond permissible limitBangladesh J. Sci. Ind. Res. 51(2), 147-154, 2016

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Assessment of Water Pollutants from Asphalt Pavement Containing Recycled Rubber in Rhode Island

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/1626-12 ◽

1998 ◽

Vol 1626 (1) ◽

pp. 95-104 ◽

Cited By ~ 2

Author(s):

Pradeep Vashisth ◽

K. Wayne Lee ◽

Raymond M. Wright

Keyword(s):

Water Quality ◽

Rhode Island ◽

Environmental Conditions ◽

Water Samples ◽

Quality Evaluation ◽

Asphalt Pavement ◽

Crumb Rubber ◽

Water Quality Criteria ◽

Water Quality Evaluation ◽

Recycled Rubber

Use of recycled rubber in asphalt pavement has been widely accepted since it overcame the scrap tires disposal problem and it has many advantages—for example, savings in quantity and cost of construction materials. In this study, hot-mix asphalt (HMA) specimens with or without crumb rubber modifier (CRM) were analyzed under different environmental conditions. The CRM was added into HMA by two processes (wet and dry processes). The CRM was procured from two different sources to prepare specimens (one source for each process). Cylindrical specimens were tested in a particle entrainment system at two different temperatures and three different pH levels. Slab specimens were simulated for rainfall conditions. Water samples were collected in all three phases of the study: preliminary investigations on individual CRM, water quality evaluation for cylindrical HMA specimens at various environmental conditions, and water quality evaluation for slab HMA specimens under simulated rainfall conditions. Collected water samples were analyzed for six metals: chromium, lead, nickel, copper, cadmium, and zinc. A general trend for these metals indicates that zinc was leached in higher concentrations than other metals and all the metals were leached in higher concentrations at higher temperature (maximum asphalt pavement temperature) and at lower pH (pH 2.0 conditions). Finally, based on the limited scope of this effort and comparison with water quality criteria, there does not appear to be any evidence that there will be a detrimental effect on the environment or to human health.

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