Assessment of contaminated sediment by phosphate fertilizer industrial waste using pollution indices and statistical techniques in the Gulf of Gabes (Tunisia)

Ayadi, N.; Aloulou, Fatma; Bouzid, Jalel

doi:10.1007/s12517-014-1291-4

Cited by 66 publications

(42 citation statements)

References 22 publications

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“…Previous studies have shown high levels of heavy metals in the coastal sediments close to the industrial complexes [61][62]. Particularly high concentrations were recorded in the site where the effluents are released: Cd>100 µg l , and Cr 100-120 µg l -1 [59,61]. The most important Ni and Co concentrations were observed in station 1, situated close to the phosphoric acid and fertilizer plant.…”

Section: Origin Of Trace Element Loading In Surface Waters In Three Gmentioning

confidence: 89%

“…In the southern region of the Gulf of Gabes, Cd concentrations were highest among the studied sites. In this area, the major factor behind this metallic pollution by heavy metals is phosphogypsum wastes, as shown in several previous works [61,[64][65][66][67]. Indeed, high amounts of phosphogypsum are discharged by the phosphate industry in the Gulf of Gabes, quantified at 11,250 tons per day and stretching along large surfaces in the open sea with deleterious effects on biota [60,[64][65]68].…”

Section: Origin Of Trace Element Loading In Surface Waters In Three Gmentioning

confidence: 98%

“…With the absence of scavenging processes and treatment plants for industrial wastes, persistent toxic elements and heavy metals find their way into the sea. Alarmingly, 10,000 to 12,000 tons of phosphogypsum, containing heavy metals (mainly Cd, Pb, Zn, Cu, and Cr), are released in the sea of GA per day [59][60][61]. Previous studies have shown high levels of heavy metals in the coastal sediments close to the industrial complexes [61][62].…”

Section: Origin Of Trace Element Loading In Surface Waters In Three Gmentioning

confidence: 99%

“…Alarmingly, 10,000 to 12,000 tons of phosphogypsum, containing heavy metals (mainly Cd, Pb, Zn, Cu, and Cr), are released in the sea of GA per day [59][60][61]. Previous studies have shown high levels of heavy metals in the coastal sediments close to the industrial complexes [61][62]. Particularly high concentrations were recorded in the site where the effluents are released: Cd>100 µg l , and Cr 100-120 µg l -1 [59,61].…”

Section: Origin Of Trace Element Loading In Surface Waters In Three Gmentioning

confidence: 99%

“…Zn contamination could be related to phosphogypsum residues generated by the phosphate industry. Indeed, high Zn concentrations in sediments were reported in the outer fishing harbor of Gabes, with values reaching 1,200 μg g -1 dw in July 2010 [61,63] and 7,165 μg g -1 dw during September 2013 in Chatt Essalem, close to the fishing harbor [63,67]. The major sources of Zn are domestic and municipal wastes, followed by dumping and atmospheric deposition [74][75][76].…”

Section: Origin Of Trace Element Loading In Surface Waters In Three Gmentioning

confidence: 99%

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Spatial Distribution and Source Identification of Heavy Metals in Surface Waters of Three Coastal Areas of Tunisia

Drira¹,

Sahnoun²,

Ayadi³

2017

Pol. J. Environ. Stud.

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The concentrations of selected dissolved trace elements (Ni 446-919 µg L -1 , Pb 383-1015, Fe 195-739, Cu 217-318, Cr 156-336, Zn 9-236, Mn 0-187, Co 0-310, and Cd 26-77) were assessed in the surface water of 30 stations belonging to three coastal areas along the Gulf of Gabes, i.e., the southern (stations 1-10) and northern (stations 11-20) coastal areas of Sfax and the Ghannouch area (stations 21-30) during October and November 2014. Results showed that dissolved metals in surface waters, which were analyzed by means of flame atomic absorption spectrophotometry, followed the concentration levels (Pb>Ni>Fe>Cu>Cr>Co>Mn>Cd>Zn) on the southern and (Ni>Pb>Fe>Cu>Cr>Zn>Mn>Co>Cd) on the northern coasts of Sfax, and (Ni> Fe>Pb>Cu>Cr>Zn>Co>Cd>Mn) in the Ghannouch area. In the southern and the northern coasts of Sfax, all analyzed metals were detected in 100% of sampled stations except Co, which was revealed in 90 and 80% of stations, respectively. However, in the Ghannouch area all analyzed metals were detected in 100% of sampled stations except Mn, which was revealed in 70% of stations. These trace elements, except for Fe and Mn, exceeded the safety limit of the USEPA water quality criteria for the protection of aquatic fauna and flora survival and their uses. The Sfax and Ghannouch coastal areas should be considered relatively polluted with metals (Zn, Ni, Pb, Co, Cr, Cd, and Cu). The elevated metal contents were attributed to anthropogenic waste inputs around the study area. The main sources of Ni and Co loading in the seawater were the SIAPE phosphoric acid and fertilizer plant and a waste water treatment plant located close to station 1. Whereas the fishing harbor of Sfax, which is situated on the southern coast (station 9), is the second source of high amounts of Cd, Mn, Cr, and Pb. This situation has led to serious human health risks and chronic toxicity caused by their potential bioaccumulation in some aquatic fauna such as shrimp, fish, crab, shellfish, mollusk, and cephalopoda.

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Section: Origin Of Trace Element Loading In Surface Waters In Three Gmentioning

confidence: 89%

Section: Origin Of Trace Element Loading In Surface Waters In Three Gmentioning

confidence: 98%

Section: Origin Of Trace Element Loading In Surface Waters In Three Gmentioning

confidence: 99%

Section: Origin Of Trace Element Loading In Surface Waters In Three Gmentioning

confidence: 99%

Section: Origin Of Trace Element Loading In Surface Waters In Three Gmentioning

confidence: 99%

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Spatial Distribution and Source Identification of Heavy Metals in Surface Waters of Three Coastal Areas of Tunisia

Drira¹,

Sahnoun²,

Ayadi³

2017

Pol. J. Environ. Stud.

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Clustering of bivariate satellite time series: A quantile approach

2022

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Clustering has received much attention in statistics and machine learning with the aim of developing statistical models and autonomous algorithms which are capable of acquiring information from raw data in order to perform exploratory analysis. Several techniques have been developed to cluster sampled univariate vectors only considering the average value over the whole period and as such they have not been able to explore fully the underlying distribution as well as other features of the data, especially in presence of structured time series. We propose a model‐based clustering technique that is based on quantile regression permitting us to cluster bivariate time series at different quantile levels. We model the within cluster density using asymmetric Laplace distribution allowing us to take into account asymmetry in the distribution of the data. We evaluate the performance of the proposed technique through a simulation study. The method is then applied to cluster time series observed from Glob‐color satellite data related to trophic status indices with aim of evaluating their temporal dynamics in order to identify homogeneous areas, in terms of trophic status, in the Gulf of Gabes.

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Major fertilization sources and mechanisms for Mediterranean Sea coastal ecosystems

Macías

García-Górriz

Adolf

2017

Limnology & Oceanography

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The Mediterranean Sea is considered an oligotrophic basin with a few biological production hotspots. Some of these productive regions are under the influence of large rivers' discharges and have been described to suffer from eutrophication indications. In order to quantify the impact of the river-borne inorganic nutrients on the pelagic production levels and bottom oxygen conditions in the northern coast of the Mediterranean Sea, two hindcast simulations using a coupled hydrodynamic-biogeochemical model are compared. Both simulations cover a 60 yr period and are identical except for the rivers' conditions, one is performed considering realistic inorganic nutrient levels in the rivers' waters while the second has no inorganic nutrients coming from the freshwater discharges. Comparing these two simulations we found that inorganic nutrients in the rivers are responsible for a large fraction of the pelagic primary production and for the totality of bottom hypoxic zones in both the Adriatic and Aegean basin. On the contrary, river fertilization is of marginal importance for the coastal ecosystem of the NW Mediterranean Sea, where mesoscale processes and associated vertical transport of nutrients are the main processes responsible for the majority of the production. We, finally, discuss the consequences of these fundamental differences in fertilization for freshwater management and ecosystems status evaluation in the light of different policy options and within the context of future climate change.

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Assessment of contaminated sediment by phosphate fertilizer industrial waste using pollution indices and statistical techniques in the Gulf of Gabes (Tunisia)

Cited by 66 publications

References 22 publications

Spatial Distribution and Source Identification of Heavy Metals in Surface Waters of Three Coastal Areas of Tunisia

Spatial Distribution and Source Identification of Heavy Metals in Surface Waters of Three Coastal Areas of Tunisia

Clustering of bivariate satellite time series: A quantile approach

Major fertilization sources and mechanisms for Mediterranean Sea coastal ecosystems

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