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  • 1
    Electronic Resource
    Electronic Resource
    The analysis of nitrate in highly saline waters (1997)
    Springer
    International journal of salt lake research 6 (1997), S. 269-278 
    Details
    ISSN: 1573-8590
    Keywords: nitrate analysis ; salt effect ; salinity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract The analysis of nitrate in seawater and hypersalinewaters should take account of a significant “salteffect”. Procedures developed for fresh water andmarine waters must be applied cautiously to highlysaline waters. The most widely used standard methodfor the determination of nitrate-nitrogen (NO3-N)in fresh and marine waters involves the quantitativereduction of nitrate by the Cd column techniquefollowed by colorimetric procedures. In our study,three approaches to estimate NO3-N in highlysaline waters were examined. The first involveddilution. This approach overcame the salt effect butdilution limited the detection of low concentrationsof nitrate in highly saline waters. The secondinvolved the use of standard nitrate solutions insaline water. This method is not recommended becauseof nitrate impurities in AR grade salts. The third-and preferred approach-involved the use of standardadditions. “Spikes” of a known volume of NO3-Nstandard solution were added to natural saline waters. Nitrate values estimated by the standard additionmethod were used to calculate an equation for salterror correction at different salinities applicable towaters with the same relative ionic composition asseawater. This could then be used to correct nitratedeterminations in highly saline waters where standardsmade in distilled water were used for calibration.Many previously published data for NO3-N insaline water used methods of analysis which do nottake account of salt error and are therefore probablyin error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009008120817
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The analysis of nitrate in highly saline waters (1997)
    Springer
    International journal of salt lake research 6 (1997), S. 269-278 
    Details
    ISSN: 1573-8590
    Keywords: nitrate analysis ; salt effect ; salinity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract The analysis of nitrate in seawater and hypersaline waters should take account of a significant “salt effect”. Procedures developed for fresh water and marine waters must be applied cautiously to highly saline waters. The most widely used standard method for the determination of nitrate-nitrogen (NO3-N) in fresh and marine waters involves the quantitative reduction of nitrate by the Cd column technique followed by colorimetric procedures. In our study, three approaches to estimate NO3-N in highly saline waters were examined. The first involved dilution. This approach overcame the salt effect but dilution limited the detection of low concentrations of nitrate in highly saline waters. The second involved the use of standard nitrate solutions in saline water. This method is not recommended because of nitrate impurities in AR grade salts. The third- and preferred approach-involved the use of standard additions. “Spikes” of a known volume of NO3-N standard solution were added to natural saline waters. Nitrate values estimated by the stadard addition method were used to calculate an equation for salt error correction at different salinities applicable to waters with the same relative ionic composition as seawater. This could then be used to correct nitrate determinations in highly saline waters where standards made in distilled water were used for calibration. Many previously published data for NO3-N in saline water used methods of analysis which do not take account of salt error and are therefore probably in error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02449929
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    Paper (German National Licenses)
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  • 3
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    Assessment of groundwater suitability for irrigation in a gold mine surrounding area, NE Iran (2018)
    Springer
    Details
    Publication Date: 2018-11-01
    Print ISSN: 1866-6280
    Electronic ISSN: 1866-6299
    Topics: Geosciences
    Published by Springer
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    PAPER CURRENT
  • 4
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    Determination of developmental stages of embryo in the Sea Urchin, Echinometra mathaei (2018)
    Details
    Publication Date: 2021-05-19
    Description: Sea Urchin is one of the most useful tools in developmental biology studies because this organism has the simplest kind of developmental stages. We aimed to determine developmental stages and timetable of Echinometra mathaei embryo (the species of Persian Gulf). The spawning of E. mathaei was induced by 0.5M KCl injection (1ml) into the coelomic cavity. After fertilization, embryos were placed in beakers and were incubated at 29◦C and a salinity of 39 ppt until embryos reached the pluteus stage. The developmental stages of embryos and the timing of each stage including cleavage, morulae, blastula, gastrula, prism and pluteus larvae were studied under the microscope. Our results showed that after 30 hours from fertilization time, the embryos developed to pluteus larvae. E. mathaei had the shorter development time in comparison to the other Sea Urchin species. Therefore, it may be appropriate as a model organism in biological researches.
    Description: Published
    Keywords: Determination ; Sea Urchin ; Echinometra mathaei ; Biological Model ; Development ; Timetable ; Species
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.294-304
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  • 5
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    Studying of Artemia sp. production in Gonabad salt-waters, Kavir-e-Namak Basin, eastern Iran (2018)
    Details
    Publication Date: 2021-05-19
    Description: A preliminary stock assessment of Artemia sp. has been carried out for the first time in Gonabad salt-waters, situated in the Kavir-e-Namak Basin, a salty desert in eastern Iran. We conducted seasonal analysis of physico-chemical and biological properties of salt-waters for two stations in the study area over the year 2002. Hand-held plankton net was used with a mesh size of 20mm to collect phytoplankton samples. We identified five families of phytoplankton such as: Nitzschiaceae, Naviculaceae, Cymbellaceae, Oscillatoriaceae and Nostocaceae in the salt-waters of the area. Phytoplankton species from family Nitzschiaceae were the most abundant, present in the waters year-round and comprised the main food item for Artemia sp. in the region. Phytoplankton abundance was highest during spring and earlier of autumn and Artemia sp. showed a fluctuation in their density over the year, increasing gradually from spring to winter in one station and from spring to autumn in another. Considering the optimal physico-chemical and biological properties for Artemia sp. production and development, we concluded that the best time period for Artemia sp. production start from May to November in Kaleshor area around the Kavir-e-Namak Basin.
    Description: Published
    Keywords: Brackish ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.99-118
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  • 6
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    Studying of Artemia sp. production in Gonabad salt-waters, Kavir-e-Namak Basin, eastern Iran (2018)
    Details
    Publication Date: 2021-05-19
    Description: A preliminary stock assessment of Artemia sp. has been carried out in Gonabad salt- waters, situated in the Kavir-e-Namak Basin of eastern Iran for the first time. We conducted seasonal analysis of physico-chemical and biological properties of salt-waters for two stations in the study area over the year 2002. Hand-held plankton net used with a mesh size or 20mm to collect phytoplankton samples. We identified five families of phytoplankton in the salt-waters of the area. These were Nitzschiaceae, Naviculaceae, Cymbellaceae, Oscillatoriaceae and Nostocaceae. Phytoplankton species from family Nitzschiaceae were the most abundant, present in the waters year-round and comprised the main food item for Artemia sp. in the region. Phytoplankton abundance was highest during spring and earlier autumn and Artemia sp. showed a fluctuation in their density over the year, increasing gradually from spring to in one station and from spring to autumn in another. Considering the optimal physico-chemical and biological properties for Artemia sp. production and development, we concluded that best time period for Artemia sp. production is May to November in Kaleshor area.
    Description: Published
    Keywords: Physico-chemical ; Biological ; Artemia sp. ; Saline water ; Abundance ; Kaleshor ; Stock assessment ; Plankton ; Phytoplankton ; Nitzschiaceae ; Naviculaceae ; Cymbellaceae ; Oscillatoriaceae ; Nostocaceae ; Species ; Density
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.99-118
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  • 7
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    Studying of Artemia sp. production in Gonabad salt-waters, Kavir-e-Namak Basin, eastern Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/24269 | 18721 | 2018-08-04 06:16:17 | 24269 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: A preliminary stock assessment of Artemia sp. has been carried out for the first time in Gonabad salt-waters, situated in the Kavir-e-Namak Basin, a salty desert in eastern Iran. We conducted seasonal analysis of physico-chemical and biological properties of salt-waters for two stations in the study area over the year 2002. Hand-held plankton net was used with a mesh size of 20mm to collect phytoplankton samples. We identified five families of phytoplankton such as: Nitzschiaceae, Naviculaceae, Cymbellaceae, Oscillatoriaceae and Nostocaceae in the salt-waters of the area. Phytoplankton species from family Nitzschiaceae were the most abundant, present in the waters year-round and comprised the main food item for Artemia sp. in the region. Phytoplankton abundance was highest during spring and earlier of autumn and Artemia sp. showed a fluctuation in their density over the year, increasing gradually from spring to winter in one station and from spring to autumn in another. Considering the optimal physico-chemical and biological properties for Artemia sp. production and development, we concluded that the best time period for Artemia sp. production start from May to November in Kaleshor area around the Kavir-e-Namak Basin.
    Keywords: Biology ; Artemia ; Saline water ; Abundance ; Kaleshor ; Gonabad salt-waters ; Kavir-e-Namak Basin ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 99-118
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  • 8
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    Determination of developmental stages of embryo in the sea urchin, Echinometra mathaei (2021)
    In:  http://aquaticcommons.org/id/eprint/22512 | 18721 | 2018-04-16 21:02:07 | 22512 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: Sea Urchin is one of the most useful tools in developmental biology studies because this organism has the simplest kind of developmental stages. We aimed to determine developmental stages and timetable of Echinometra mathaei embryo (the species of Persian Gulf). The spawning of E. mathaei was induced by 0.5M KCl injection (1ml) into the coelomic cavity. After fertilization, embryos were placed in beakers and were incubated at 29°C and a salinity of 39 ppt until embryos reached the pluteus stage. The developmental stages of embryos and the timing of each stage including cleavage, morulae, blastula, gastrula, prism and pluteus larvae were studied under the microscope. Our results showed that after 30 hours from fertilization time, the embryos developed to pluteus larvae. E. mathaei had the shorter development time in comparison to the other Sea Urchin species. Therefore, it may be appropriate as a model organism in biological researches.
    Keywords: Biology ; Sea Urchin ; Echinometra mathaei ; Biological Model ; Development ; Timetable ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 294-304
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  • 9
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    Species diversity and ecological studies of phytoplankton in the Bazangan Lake (2021)
    In:  http://aquaticcommons.org/id/eprint/24282 | 18721 | 2018-08-04 07:09:43 | 24282 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Bazangan, the Khorasan largest natural lake, is located in Northeast. 120km from Mashhad with the area of 690000m2. The purpose of this study was to characterize ecological aspects and to compare seasonal variations in species diversity of phytoplanktons in the surface water of littoral zone in the Bazangan lake. Samples were collected from eleven stations in each season during the year 2002. Some ecological factors such as pH. EC, salinity, hardness of water, nutrients and water temperature were measured. Four macroalgae and 33 phytoplankton species belonging to 5 algae groups viz. Chrysophyta (21 species). Chlorophyta (7 species), Cyanophyta (4 species) and Pyrrophyta (1 species) were identified. Diatoma tennis. Fragillaria crotonensis, Lilothrix subtilissinia and Merisinopodia punctata had the most species abundance. Comparing to other groups, Chrysophyta was abundant in all seasons mostly in the spring and summer. Different numerical indices of diversity such as species richness, evenness and diversity as well as parametric families of diversity were obtained in different seasons based on the abundance data of phytoplanktons. The results showed that the highest species diversity of the phytoplanktons could be seen in the summer and autumn. The Bazangan is classified as an oligothroph and a subsaline lake.
    Keywords: Ecology ; Species diversity ; Phytoplankton ; Bazangan Lake ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 73-90
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  • 10
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    Species diversity and ecological studies of phytoplankton in the Bazangan Lake (2018)
    Details
    Publication Date: 2021-05-19
    Description: Bazangan, the Khorasan largest natural lake, is located in Northeast. 120km from Mashhad with the area of 690000m2. The purpose of this study was to characterize ecological aspects and to compare seasonal variations in species diversity of phytoplanktons in the surface water of littoral zone in the Bazangan lake. Samples were collected from eleven stations in each season during the year 2002. Some ecological factors such as pH. EC, salinity, hardness of water, nutrients and water temperature were measured. Four macroalgae and 33 phytoplankton species belonging to 5 algae groups viz. Chrysophyta (21 species). Chlorophyta (7 species), Cyanophyta (4 species) and Pyrrophyta (1 species) were identified. Diatoma tennis. Fragillaria crotonensis, Lilothrix subtilissinia and Merisinopodia punctata had the most species abundance. Comparing to other groups, Chrysophyta was abundant in all seasons mostly in the spring and summer. Different numerical indices of diversity such as species richness, evenness and diversity as well as parametric families of diversity were obtained in different seasons based on the abundance data of phytoplanktons. The results showed that the highest species diversity of the phytoplanktons could be seen in the summer and autumn. The Bazangan is classified as an oligothroph and a subsaline lake.
    Description: Published
    Keywords: Phytoplankton ; Chrysophyta ; Chlorophyta ; Cyanophyta ; Pyrrophyta ; Fragillaria crotonensis ; Lilothrix subtilissinia ; Merisinopodia punctata ; Species diversity
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.73-90
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