Water Quality Monitoring in Kpassa Reservoir (Northen Benin): Physico-Chemical Parameters, Trophic State and N: P Ratio
Ousmane Touré Boukari,
Moctar Limam Bawa,
Daouda Mama,
Youssouf Abou
Issue:
Volume 7, Issue 1, February 2018
Pages:
1-9
Received:
17 November 2017
Accepted:
5 December 2017
Published:
12 January 2018
Abstract: The study was carried out to assess the physico-chemical parameters, the trophic state and the N:P ratio of the Kpassa reservoir. The reservoir was studied at six sampling sites over the period going from August 2014 to May 2016. Water transparency was determined in situ with the secchi disk SDMO QUINIOU model F043SE. Chlorophyll a, NO3-, NO2-, NH4+, PO43- and total phosphorus were analyzed using the standard methods. Measures were made with the HACH DR2800 spectrophotometer. The trophic state was assessed using the Carlson’s trophic state index (TSI). The N:P ratio was evaluated using NO3-, NO2-, NH4+ and PO43- concentrations. The physico-chemical parameters investigated were: transparency (0.25-1.92m), chlorophyll a (8.2-233.46µg/L), nitrate (undetected-4.73mg/L), nitrite (undetected-0.23mg/L), ammonia (undetected-0.21mg/L), orthophosphate (0.03-1.04mg/L) and total phosphorus (0.1-3.2mg/L). The trophic state index (TSI) values oscillate between 38 and 59. The majority of the values are characteristic of mesotrophic conditions. Kpassa reservoir is eutrophic only in August 2014 at the whole studied stations. N:P ratio values vary between 0.22 and 60.46 showing that eutrophication in Kpassa reservoir is limited by phosphorus and nitrogen. Some physico-chemical parameters values are upper than the WHO and Ifremer safe limit making the reservoir water unfit for human consumption at the concerned sites and during the concerned period. It is recommended that the national company of Benin water (SONEB) sensitize the population on the rational use of the fertilizers and the adoption of water control technics in the farm. Washing and crockery activities should be also forbidden along the reservoir river. The trophic state of the reservoir seems improved compared to previous studies results. According to the N: P ratio values, measurements to be implemented for eutrophication management in Kpassa reservoir should emphasize on the control of the flow of nitrogen and phosphorus compounds.
Abstract: The study was carried out to assess the physico-chemical parameters, the trophic state and the N:P ratio of the Kpassa reservoir. The reservoir was studied at six sampling sites over the period going from August 2014 to May 2016. Water transparency was determined in situ with the secchi disk SDMO QUINIOU model F043SE. Chlorophyll a, NO3-, NO2-, NH4...
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Influence Parameters of Storage on Process of Formation the Histamine in Fish and Fish Products
Yakov Verkhivker,
Ella Altman
Issue:
Volume 7, Issue 1, February 2018
Pages:
10-14
Received:
11 December 2017
Accepted:
1 January 2018
Published:
17 January 2018
Abstract: Results over of researches of maintenance of histamine are brought in fish. As materials for researches products are used from the different points of fishing-out of fish. For realization of researches used sensory, chemical and biological methods. The level of histamine has been examined in frozen fish and canned fish. The dynamics of histamine change that has been traced depends on the temperature of storage, technological parameters.
Abstract: Results over of researches of maintenance of histamine are brought in fish. As materials for researches products are used from the different points of fishing-out of fish. For realization of researches used sensory, chemical and biological methods. The level of histamine has been examined in frozen fish and canned fish. The dynamics of histamine ch...
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