AOAC Official Method 933.03 Fluorine (Total) in Pesticide Formulations
Distillation Method
First Action 1933
Final Action
(Applicable to H2O-soluble or H2O-insoluble insecticides in absence of gelatinous SiO2, B, and Al.)
A. Reagents
(a) Sodium alizarin sulfonate indicator.—Dissolve 0.1 g sodium alizarin sulfonate in 200 mL H2O.
(b) Thorium nitrate solution.—Approximately 0.0125M. Standardize in terms of g F/mL by titrating F obtained by distillation from standard NaF as in 933.03B. In standardizing for use withB(b), add 5 mL saturated KMnO4 solution in addition to other reagents in distillation flask.
