What is ISO 23381 about?

ISO 23381 is an international standard that covers testing for liquid fertilizers specifications to determine their salt out temperature which prevents salting out of liquid fertilizers and enables versatility in storage, transportation and handling in cold environments.

ISO 23381 specifies the test procedure for the determination of the salt out temperature (SOT), also known as the crystallization temperature (CT) of liquid (fluid) fertilizers, using an inexpensive and simple technique.

Note: ISO 23381 does not apply to -

Binary and ternary fertilizers with regards to the last crystal to disappear (LCTD)

Who is ISO 23381 for?

ISO 23381 on salt out the temperature of liquid fertilizers is applicable to:

Manufacturers of liquid fertilizers
Dealers and importers of liquid fertilizers
Testing houses for liquid fertilizers

Why should you use ISO 23381?

Liquid fertilizers cover inorganic nitrogen, phosphorus, potash, and micronutrients. They are used on crops such as cereals, grains, fruits, vegetables and plantation crops. Liquid fertilizers are the most efficient way of delivering the required nutrients to the plants. Transportation, storage and handling at cold temperatures is a problem as they can crystalize, rendering them ineffective.

ISO 23381 provides you with accurate crystallization data and a universal cost-effective method that prevents the crystallization of liquid fertilizers and facilitates their transportation, storage and handling in cold climates.

ISO 23381 provides you with a test method that is based on cooling/thawing of the liquid fertilizer in which fertilizer is cooled in a dry ice/methanol bath until the liquid is crystallized and then warms at the ambient temperature. SOT is the temperature at which the last crystal dissolves.

Guidance in ISO 23381 enables you to implement a cost-effective test method for the determination of salt out the temperature of liquid fertilizers which ensures the quality and potency of liquid fertilizers in cold environments.

BS ISO 23381:2020

Determination of salt out (crystallization) temperature of liquid fertilizers

Current, Under Review

Published:

30 Sep 2020