Abstract
Aqueous solution phase photochemistry of the herbicide bromoxynil (3,5- dibromo-4-hydroxybenzonitrile) (1) in the presence of various concentrations of sodium chloride was extensively investigated with ultraviolet radiations near 313 nm. In the presence of 0.5 to 25.0 X 10-3 M NaC1, the quantum yields for the phototransformation of the herbicide bromoxynil (1) amounted to 0.045 ± 0.005 to 0.017 ± 0.007, whereas such data was 0.052 ± 0.004 in the absence of sodium chloride. These quantum yield data for the photolysis of 1 in the absence and presence of sodium chloride followed the Stern-Volmer equation, thereby indicating that NaC1 apparently exerted quenching effects on the photolysis of the compound 1. The rates of photodegradation of the herbicide 1 in water were slower with than without the presence of sodium chloride.
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