
Contents
7.2.45
AOAC Official Method 939.01
Thallous Sulfate in Rodenticide Formulations
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Published:January 2023
Cite
Thallous Sulfate in Rodenticide Formulations', in Dr. George W Latimer, Jr. (ed.), Official Methods of Analysis of AOAC INTERNATIONAL, 22nd Edition (
Extract
First Action 1939
Final Action
Weigh test portion containing 0.1–0.15 g Tl2SO4 (usually 10 g), transfer to 800 mL Kjeldahl flask, and add 25 mL H2SO4 followed by 5–10 mL HNO3. After first violent reaction ceases, heat until white fumes of H2SO4 appear. Add few drops fuming HNO3 and continue heating and adding HNO3 until organic matter is destroyed, as shown by colorless or light yellow solution. Cool, add 10–15 mL H2O, again cool, and wash contents of flask into 400 mL beaker, continuing washing until volume is 60–70 mL. Boil several minutes to remove all HNO3, cool, and filter into 400 mL beaker. Wash with hot H2O until volume in beaker is 175 mL, neutralize with NH4OH, and then slightly acidify with H2SO4 (1 + 4). Add 1 g NaHSO3 to ensure reduction of thallic to thallous state. Heat to bp, add 50 mL 10% KI solution (w/v), stir, and let stand overnight. Filter through tight Gooch containing two disks S&S 589 white ribbon paper covered by medium pad of glass wool. Wash four or five times with 10 mL portions 1% KI solution (w/v), and finally with absolute alcohol. Dry to constant weight at 105°C (1–1.5 h), and weigh as TlI.
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