 Wildland
Fire Chemicals
Evaluation of Wildland Fire Chemicals
Standard Test Procedures
STP 4.1—Salt Content Determination
Summary:
Because the amount of chemical salt(s) in a long-term retardant formulation
is directly related to the effectiveness of a product, it is important
to know the level of salt(s) in a test sample of a product.
Standard fertilizer analysis methods are used to determine ammoniacal
nitrogen, total phosphate, and ortho-phosphate.
A sample of the product that was submitted to the Forest Service for
qualification testing is sent to an approved testing lab. Results are
sent back to the Forest Service.
The Project Leader for Fire Chemicals compiles the results and prepares
a letter to the supplier showing the results of the salt content
determination on the submitted product.
Method:
- All testing shall be performed in accordance with protocols of
the AOAC International or other Forest Service approved methods.
- Ammoniacal
nitrogen, total phosphate, and ortho-phosphate analyses shall
be determined on long-term retardant concentrates and mixed
products as required.
References:
- AOAC International. Nitrogen (Ammoniacal) in Fertilizers; Official
Method 920.03.
- AOAC International. Phosphorus (Total) in Fertilizers;
Official Method 958.01.
- Association of Fertilizer and Phosphate
Chemists. Methods of Analysis for Phosphoric Acid, Superphosphate,
Triple Superphosphate,
and Ammonium Phosphate; 11-20 Section 7,Orthophosphate.
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