Wir benötigen Ihre Einwilligung zur Verwendung der einzelnen Daten, damit Sie unter anderem Informationen zu Ihren Interessen einsehen können. Klicken Sie auf "OK", um Ihre Zustimmung zu erteilen.
Standard Test Method for Water in Liquid Naval Stores
Automatische name übersetzung:
Standard Test Method for Wasser in flüssiger Naval Stores
NORM herausgegeben am 1.6.2008
Bezeichnung normen: ASTM D890-98(2008)
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 1.6.2008
SKU: NS-39632
Zahl der Seiten: 3
Gewicht ca.: 9 g (0.02 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
azeotropic, coulometric, Karl Fischer, moisture, naval stores, pine oil, tall oil, terpenes, turpentine, water, Moisture analysis--paints/related coatings/materials, Water content--paints/related coatings/materials, Dipentene, Iodine-pyridine-sulfur dioxide reagent, Naval stores, Oils, Pinene, Pine oil, Refined tall oil, Tall oil fatty acids, Tall oil/tall oil rosin, Turpentine, ICS Number Code 87.060.30 (Solvents)
Significance and Use | ||||
Many naval stores products contain water as a result of the processes used for their production. Typically refined products such as terpenes, pine oil, tall oil fatty acids, and distilled tall oil contain only traces of water, but crude tall oil might contain 0.5 to 2.5 % of water. Although the Karl Fischer and coulometric methods are most applicable to low levels of moisture, these can be and are used at higher levels. The azeotropic distillation method is generally used at higher levels. |
||||
1. Scope | ||||
1.1 These test methods cover the quantitative determination of dissolved or occluded water present in any proportion in liquid naval stores, such as turpentine, pinene, dipentene, pine oil, tall oil, and tall oil fatty acids. Three methods of moisture testing are included. The Karl Fisher titration method is the preferred method for testing tall oil, Test Methods D 803. 1.1.1 The Karl Fischer Titration method is based on the reaction between water and a complex reagent consisting of iodine, sulfur dioxide, pyridine, and methanol, whereby the iodine is converted to a colorless compound. The appearance of a persistent iodine color in the reaction mixture indicates the complete removal of free water by reaction with the reagent, and the endpoint may be measured colorimetrically. Automatic titrators find this endpoint by the restoration of a current strength when the resistance provided by the presence of water is eliminated. Amperometric automatic titrators find this endpoint by detecting the current flow that occurs once water is eliminated. 1.1.2 The coulometric titration method determines water content by electronic integration of a current sufficient to generate the precise amount of iodine from the required reagent to react with the water in the sample. 1.1.3 The azeotropic method utilizes the relatively low boiling point of water, as compared with other sample constituents, in a toluene or xylene matrix so that water is collected in a trap and measured. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
||||
2. Referenced Documents | ||||
|
Bereitstellung von aktuellen Informationen über legislative Vorschriften in der Sammlung der Gesetze bis zum Jahr 1945.
Aktualisierung 2x pro Monat!
Brauchen Sie mehr Informationen? Sehen Sie sich diese Seite an.
Letzte Aktualisierung: 2024-09-15 (Zahl der Positionen: 2 433 670)
© Copyright 2024 NORMSERVIS s.r.o.