Though hydroxylamine (NH₂OH) is effective for accelerating pollutants degradation in Fenton and Fenton-like systems, the effect of anions simultaneously introduced by the hydroxylamine salts have always been ignored. Herein, effect of two commonly used hydroxylamine salts, hydroxylamine hydrochloride (NH₂OH·HCl) and hydroxylamine sulfate [(NH₂OH)₂·H₂SO₄], for the degradation of dimethyl phthalate (DMP) in peroxymonosulfate (PMS)/Fe(II) system was comparatively investigated. Degradation efficiency of DMP with NH₂OH·HCl was 1.6 times of that with same dosages of (NH₂OH)₂·H₂SO₄. SO₄^·−, Fe(IV) and ·OH formed in the PMS/Fe(II)/NH₂OH system, but ·OH was the major species for DMP degradation. Addition of Cl⁻ significantly improved the production of ·OH and Cl·, and the exposure dose of ·OH (CT_·OH) was more than 10 times that of CT_Cl· as the concentration of Cl⁻ increased to 1 mM. Calculations based on branching ratios of Cl· and ·OH indicated that the reactions of Cl⁻ with SO₄^·− and Cl· with H₂O were not the only production sources of ·OH in the system. Further experiments with methyl phenyl sulfoxide (PMSO) as the probe indicated that Cl⁻ would facilitate the shift of reactive species from Fe(IV) to radicals (SO₄^·− or ·OH) in the system. Both hydroxylation and nitration intermediate products were detected in the oxidation of DMP. Cl⁻ promoted the formation of hydroxylation intermediates and reduced the formation of nitration intermediates. This study revealed for the first time that Cl⁻ could shift reactive species from Fe(IV) to radicals in PMS/Fe(II) system, raising attention to the influence of the coexisting anions (especially Cl⁻) for pollutants oxidation in iron-related oxidation processes.

尽管羟胺（NH ₂ OH）在加速Fenton和类似Fenton的系统中对加速污染物的降解是有效的，但是羟胺盐同时引入的阴离子的作用始终被忽略。本文中，两种常用的羟胺盐，即盐酸羟胺（NH ₂ OH · HCl）和硫酸羟胺[[NH ₂ OH）₂ · H ₂ SO ₄ ]的作用，用于降解过氧单硫酸盐（PMS）中的邻苯二甲酸二甲酯（DMP）。 / Fe（II）系统进行了比较研究。NH ₂ OH · HCl对DMP的降解效率是相同剂量（NH ₂ OH）的1.6倍₂ · H ₂ SO ₄。在PMS / Fe（II）/ NH ₂ OH系统中形成了SO ₄ ^{· −}，Fe（IV）和· OH ，但是· OH是DMP降解的主要物质。的Cl加成^-显著提高了生产的· OH和Cl ·，和的曝光剂量· OH（CT _{· OH}）为10倍以上的是CT的_氯·例如Cl的浓度^-增加至1mM。基于Cl ·和·的分支比的计算OH表示，Cl组成的反应^-与SO ₄ ^{· -}和Cl ·用H ₂ ö不是唯一的生产源·系统中的OH。用甲基苯基亚砜（PMSO）作为探针进一步的实验表明，氯^-将促进反应性物质的选自Fe（IV）的基团，以移位（SO ₄ ^{· -}或· OH）制得。在DMP的氧化过程中均检测到羟基化和硝化中间产物。氯^-促进了羟基化中间体的形成并减少了硝化中间体的形成。这项研究揭示了首次氯^-可能的活性物质从铁（IV）在PMS /铁自由基（II）系统转移，提高关注共存阴离子（特别是CI的影响^- ）中铁污染物氧化相关的氧化过程。