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Determination of the water solubility of the fungicide chlorothalonil

Date

1994

Authors

Hatheway, James L., Jr., author
Walters, Richard, advisor
Sanders, Tom, committee member
Ward, Robert, committee member

Journal Title

Journal ISSN

Volume Title

Abstract

A UV-Visible spectrophotometric analytical procedure was developed and used to measure the water solubility of chlorothalonil at temperatures ranging from 8.5 to 37.5 °C. The effect of formulation chemicals present in BRAVO®500, a pesticide formulation containing chlorothalonil, on the apparent water solubility of chlorothalonil was also assessed. The water solubility was measured using a generator column technique while the apparent solubility enhancement of chlorothalonil by formulation chemicals in diluted formulation was evaluated by both generator column and batch shake techniques. A water solubility of 0.492 to 1.85 mg/L was found for a temperature range of 8.5 to 37.5 °C. The enthalpy of solution was found to be 7.96 kcal/mole. The apparent solubility enhancement due to formulation chemicals in dilute BRAVO®500 solution was 0.942 mg/L at 23 °C, which yielded a log Kdoc of 4.24. Based upon these results and typical formulation application rates, it is unlikely that the formulation chemicals present in the BRAVO® 500 formulation would increase the mobility of chlorothalonil in the environment.

Description

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Subject

Fungicides -- Solubility
Fungicides -- Environmental aspects

Citation

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