
Contents
7.5.01
AOAC Official Method 953.05
Allethrin (Technical) and Pesticide Formulations: Titrimetric Method
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Published:January 2023
Cite
Allethrin (Technical) and Pesticide Formulations: Titrimetric Method', in Dr. George W Latimer, Jr. (ed.), Official Methods of Analysis of AOAC INTERNATIONAL, 22nd Edition (
Extract
First Action 1953
Caution: See safety notes on pesticides.
Principle
Allethrin reacts quant. with ethylenediamine to form chrysanthemum monocarboxylic acid which is determined by titration with standard NaOMe in pyridine. Chrysanthemum monocarboxylic acid, anhydride, and acid chloride interfere quant. and are determined independently.
Reagents
...
Determination of Chrysanthemum Monocarboxylic Acid Chloride
Add 8–10 drops mixed indictor, B(g), to ca 150 mL anhydrous MeOH and add 0.1 N HCl, B(b), dropwise until solution appears reddish brown by transmitted light. Add 0.02 N KOH, B(d), dropwise until appearance of first green. Transfer 25 mL to each of three 125 mL glass-stoppered Erlenmeyers, reserving one flask as reference color for end point. Into each of other flasks, add 1.5–2.5 g sample from weighing pipet, swirling flask while adding sample. Within 5 min, titrate with 0.02 N KOH, B(d), to first green end point, using blank as reference color. Calculate milliequivalent chrysanthemum monocarboxylic acid chloride/g sample:
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