BS 4258-4:1975

This standard BS 4258-4:1975 Methods of test for phosphoric acid (orthophosphoric acid) for industrial use is classified in these ICS categories:

• 71.060.30 Acids

This Part of BS 4258 specifies an alizarin complexone and lanthanum (III) nitrate photometric method for the determination of the fluorine content of orthophosphoric acid for industrial and food uses.

The method is applicable to products whose fluorine (F) content is equal to or greater than 10 mg/kg.

Photometric method applicable to fluorine levels of 10 mg/kg and higher.