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Further water solubility determinations of insecticidal compounds
Summary
This study measured the aqueous solubility of 39 insecticidal compounds at 20°C. Several pesticides showed significant differences compared to previously reported solubility values.
Area of Science:
- Environmental Chemistry
- Agrochemical Science
Background:
- Accurate aqueous solubility data is crucial for assessing pesticide environmental fate and bioavailability.
- Existing literature values for some insecticidal compounds may require re-evaluation.
Purpose of the Study:
- To determine the aqueous solubility of 39 insecticidal and related compounds.
- To compare experimentally determined solubilities with reported literature values.
Main Methods:
- Aqueous solubility was determined using a standardized shaking and centrifugation method.
- Measurements were conducted at a controlled temperature of 20 ± 1.5°C.
Main Results:
- Solubility values for fenamiphos, fenthion, and methidathion were substantially lower than previously reported.
- Solubilities for aminocarb, diazinon, dicapthon, pirimiphos-ethyl, and pirimiphos-methyl were substantially higher than reported.
Conclusions:
- Experimental determination of aqueous solubility is essential for accurate pesticide risk assessment.
- Discrepancies highlight the need for updated solubility data in environmental modeling.