本文对Fenton法与类Fenton法降解土壤中的二苯砷酸（ diphenylarsinic acid，DPAA）进行了研究．考察了H2 O2投加量和催化剂种类（ Fe2＋／Fe3＋）对红壤及黑土中DPAA降解效果的影响，并采用高效液相色谱?质谱联用法（ HPLC?MS／MS）对降解中间产物进行了初步鉴定．结果显示，针对红壤与黑土分别采用类Fenton法与Fenton法，在H2 O2投加浓度为1 mol·L－1，含铁催化剂浓度为0．25 mol·L－1，土水比为1∶3，反应时间为1 h的条件下，红壤及黑土中DPAA的降解率均可达到65％以上． HPLC?MS／MS的分析结果表明，DPAA可脱苯环形成降解产物苯砷酸（ phenylarsinic acid，PAA），而PAA进一步氧化生成无机砷，这可能是Fenton ／类Fenton法降解DPAA的途径之一．
Degradation of diphenylarsinic acid ( DPAA) in soil by Fenton and Fenton?like reactions was studied in this paper. The influence of H2O2 dosage and catalyst species (i.e., Fe2+, Fe3+) on the degradation efficiency of DPAA in Acrisol and Phaeozem was investigated. High performance liquid chromatography coupled with tandem mass spectrometry ( HPLC?MS/MS) was employed to identify the degradation intermediates. The results showed that under the preparation conditions of initial H2O2 dosage of 1 mol·L-1, iron catalyst dosage of 0.25 mol·L-1, soil?water ratio of 1∶3 and reaction time of 1 h, more than 65% DPAA in Acrisol and Phaeozem were removed by Fenton?like oxidation and Fenton oxidation. HPLC?MS/MS analysis demonstrated that DPAA was degraded to phenylarsinic ( PAA ) by dephenylation, and subsequently partially oxidized to form inorganic arsenic, which may be one possible degradation pathway of DPAA during Fenton and Fenton?like reactions.
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