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  • 1
    Digitale Medien
    Digitale Medien
    Definition and measurement of salinity in salt lakes (1994)
    Springer
    International journal of salt lake research 3 (1994), S. 53-63 
    Details
    ISSN: 1573-8590
    Schlagwort(e): salinity ; athalassic ; salt lakes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geographie
    Notizen: Abstract Salinity is the most important chemical attribute of athalassic salt lakes. Even so, some confusion persists of what ‘salinity’ means and how to measure it. For sal lakes, salinity is best defined as the sum total of all ion concentrations, or total ion concentration. Ideally, it is recommended that salinities be expressed on a mass per mass basis and as ppt (parts per thousand). Direct measurements of salinity can only be derived from full ionic analyses. Indirect measurements can be derived by determinations of density, conductivity, freezing point depression and total dissolved solids or matter.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01990642
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): nitrate analysis ; salt effect ; salinity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geographie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009008120817
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): nitrate analysis ; salt effect ; salinity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geographie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02449929
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