On a different page of their site they say folks can get info on teh product at a link. That link is:
Analyte Unit Typical Specification Min. Max. Total Nitrogen (as N) % 13.5 13.1 - Nitric Nitrogen (as N-NO3) % 13.5 13.1 - Water Soluble Potassium (as K2O) %
www.haifa-group.com
That link does not provide useful purity info. It just lists the ordinary legal requirements to ensure a fertilizer has the nitrate and potassium claimed.
A far better sort of analysis is provided by a food grade (FCC) or other grade like USP, BP, ACS reagent, etc..
For example, the food grade requirement for potassium phosphate is:
Dipotassium Monophosphate; Dipotassium Phosphate K2HPO4
Formula wt 174.18 INS: 340(ii)
CAS: [7758-11-4]
DESCRIPTION A colorless or white, granular salt that is deliquescent when exposed to moist air. One g is soluble in about 3 mL of water. It is insoluble in alcohol.
The pH of a 1% solution is about 9. Functional Use in Foods Buffer; sequestrant; yeast food; dietary supplement.
REQUIREMENTS
Identification A 1 in 20 solution gives positive tests for Potassium and for Phosphate, Appendix IIIA.
Assay Not less than 98.0% of K2HPO4 after drying.
Arsenic (as As) Not more than 3 mg/kg.
Fluoride Not more than 10 mg/kg.
Heavy Metals (as Pb) Not more than 0.0015%.
Insoluble Substances Not more than 0.2%.
Lead Not more than 2 5 mg/kg.
Loss on Drying Not more than 2.0%.
