EN ISO 10248:1999

Fluid fertilizers - De-aeration of suspension samples by film disentrainment (ISO 10248:1996)

Describes a procedure for the de-aeration of suspension samples for physical testing. It is not suitable if the sample contains more than a trace of free ammonia, or if the sample is too viscous.

Flüssige Düngemittel - Entlüftung von Proben einer Suspension durch Bildung eines dünnen Films (ISO 10248:1996)

Diese Internationale Norm legt ein Verfahren zur Entlüftung von Proben einer Suspension für die physikalische Prüfung fest. Das Verfahren ist nicht anwendbar, wenn die Probe mehr als eine Spur an freiem Ammoniak enthält, in der Suspension ständige Zersetzung stattfindet oder die Probe zu viskos ist.

Engrais liquides - Désaération des échantillons de suspension par entraînement en couche mince (ISO 10248:1996)

Tekoča gnojila - Odzračevanje vzorcev suspenzije z ustvarjanjem tankega filma

General Information

• Status: Published
• Publication Date: 18-May-1999
• ICS: 65.080 - Fertilizers
• Technical Committee: CEN/TC 260 - Fertilizers and liming materials
• Drafting Committee: CEN/TC 260/WG 2 - Physical properties of fertilizers
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 31-Mar-2009
• Completion Date: 31-Mar-2009
• Ref Project: SIST EN ISO 10248:2002 - Fluid fertilizers - De-aeration of suspension samples by film disentrainment (ISO 10248:1996)

Overview

EN ISO 10248:1999 - titled Fluid fertilizers - De-aeration of suspension samples by film disentrainment (ISO 10248:1996) - is a CEN-adopted international standard that defines a laboratory procedure to remove entrained air from suspension samples of fluid fertilizers prior to physical testing. The standard specifies the film disentrainment technique as the preferred method for de-aeration and clarifies when the method is and is not appropriate.

Key topics and requirements

• Purpose: Provide a repeatable, reproducible procedure for removing entrained air from fertilizer suspensions so that subsequent physical measurements (density, viscosity, particle distribution, etc.) are accurate and comparable.
• Method principle: De-aeration by film disentrainment - air is separated from the suspension when a thin film of liquid travels over a surface, releasing entrained bubbles. (EN ISO 10248 standardizes the use of this principle for fertilizer suspensions.)
• Applicability limits: The procedure is not suitable if:
  • The sample contains more than a trace of free ammonia.
  • The sample viscosity is too high for effective film formation and entrainment.
• Sample integrity: Emphasizes preserving representative sample composition while removing gas inclusions; the method should not chemically alter the product.
• Laboratory implementation: Defines requirements for sample preparation, assessment of sample suitability, and when alternative de-aeration techniques should be considered. (Specific apparatus dimensions and operational parameters are contained in the standard text.)

Applications and users

Who benefits from EN ISO 10248:

• Fertilizer manufacturers conducting routine quality control of liquid and suspension fertilizers.
• Analytical and QA/QC laboratories preparing samples for physical property testing (density, viscosity, settling behavior).
• Agricultural product certifiers and conformity assessment bodies requiring standardized sample preparation methods.
• R&D teams developing new suspension formulations who need consistent de-aeration for comparative testing.

Practical uses:

• Ensures consistent test results by removing bias introduced by entrained air.
• Reduces variability in measurement of physical properties important for product performance and handling.
• Helps determine whether a sample requires alternative preparation due to ammonia content or high viscosity.

Related standards

• ISO 10248:1996 - original ISO document referenced by EN ISO 10248:1999.
• EN adoption indicates harmonization within CEN member states for laboratory practice in fertilizer testing.

Keywords: EN ISO 10248, fluid fertilizers, de-aeration, suspension samples, film disentrainment, fertilizer testing, sample preparation, CEN, ISO 10248.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flüssige Düngemittel - Entlüftung von Proben einer Suspension durch Bildung eines dünnen Films (ISO 10248:1996)Engrais liquides - Désaération des échantillons de suspension par entraînement en couche mince (ISO 10248:1996)Fluid fertilizers - De-aeration of suspe
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