Pulse radiolysis of aqueous 4-chlorophenol in dilute solutions under different conditions wasstudied. The main characteristic peaks in these transient absorption spectra were attributed and the build-up/decay trends of several transient species were investigated. Under alkaline conditions, the reaction of OHradical and 4-chlorophenol produces chlorinated phenoxyl radical with a rate constant of 4.14 × 109 L/(mol·s); while under acid conditions, the initial product is mainly OH-adduct. The reaction of H with 4-chlorophenol produces H-adduct with a rate constant about 2.0×109 L/(mol·s) and the intermediate canremove C1 from itself gradually through a second-order reaction. In alkaline solutions, eaq-can capture Cldirectly from 4-chlorophenol with a rate constant about 1.82×109 L/(mol·s).%利用脉冲电子束进行了多种条件下4-氯酚稀水溶液的脉冲辐解研究，对其瞬态光谱中的主要吸收峰作了归属，并初步考察了这些瞬态物种的生长、衰减等行为.研究表明，·OH基与4-氯酚在碱性条件下反应生成氯代酚氧基，速率常数为4.14×109L/(mol·s)，在酸性条件下要经过OH-adducts；H原子与4-氯酚反应生成H-adducts的速率常数为2.0×109L/(mol·s)，产物可通过双分子二级反应逐步脱氯；eap-可直接从4-氯酚分子夺氯，反应速率常数为1.82×109/L(mol·s).
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