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The photodegradation of β-blocker timolol in fulvic acid (FA) solution was investigated under simulated sunlight. The triplet excited state of FA ( 3 FA * ) and singlet oxygen ( 1 O 2 ) were the main reactive species responsible for the degradation of timolol in the aerated FA solutions. Both dissolved oxygen and iodide ions (I − ) are the efficient quenchers...
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