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首页> 外文期刊>Environmental toxicology and chemistry >HETEROGENEOUS PHOTOCHEMICAL REACTIONS OF DECABROMODIPHENYL ETHER
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HETEROGENEOUS PHOTOCHEMICAL REACTIONS OF DECABROMODIPHENYL ETHER

机译：十溴二苯醚的非均相光化学反应

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摘要

Brominated diphenyl ethers are a major class of brominated flame retardants, with production of decabromodiphenyl ether (DBDPE) contributing significantly to this total. Although little is known about the mechanisms and rates of DBDPE decay in the natural environment, photochemical transformation is often suggested as a potentially important fate process. In this study, photochemical reactions of DBDPE precipitated onto hydrated surfaces (quartz glass, silica particles, and humic acid-coated silica particles) were measured. Decabromodiphenyl ether was irradiated within a Rayonet photochemical reactor equipped with lamps having maximum emissions (λ_(max)) at 300 or 350 nm or with sunlight (West Lafayette, IN, USA at 40°26′N, 86°55′W). When DBDPE is plated onto quartz tubes and hydrated with reagent-grade water, phototransformation occurred over a period of days with each light source. With two lamps (λ_(max) = 300 nm), about 31% of the initial mass of DBDPE remained after 60 h in the Rayonet reactor. Decabromodiphenyl ether transformed more slowly when irradiated by sunlight, with 30% of the initial compound recovered from tubes after 72 h. In the presence of humic acid (HA) solution, transformation of DBDPE by solar irradiation is slowed even further: approximately 70% remained after 72 h. Solar irradiation of DBDPE adsorbed to humic acid-coated sand particles resulted in the slowest irradiation rates; approximately 88% of the initial mass was recovered after 96 h of exposure. Although the parent compound exhibited slow transformation, analysis by high-performance liquid chromatography (HPLC) indicated some accumulation of transformation products.
机译：溴化二苯醚是溴化阻燃剂的主要类别，十溴二苯醚（DBDPE）的生产对这一总量有很大贡献。尽管对DBDPE在自然环境中衰变的机理和速率知之甚少，但经常提出光化学转化是潜在的重要命运过程。在这项研究中，测量了DBDPE沉淀到水合表面（石英玻璃，二氧化硅颗粒和腐殖酸涂层的二氧化硅颗粒）上的光化学反应。十溴二苯醚在配备有在300或350 nm处具有最大发射（λ_（max））的灯或在日光下（美国印第安纳州西拉法叶）在40°26'N，86°55'W的Rayonet光化学反应器中进行辐照。当将DBDPE镀在石英管上并用试剂级水水合时，每种光源都会在几天内发生光转化。使用两个灯（λ_（max）= 300 nm），在Rayonet反应器中放置60 h后，约31％的DBDPE初始质量保留下来。十溴二苯醚在阳光照射下的转化速度较慢，72小时后从试管中回收了30％的初始化合物。在腐殖酸（HA）溶液的存在下，通过太阳辐射进行的DBDPE的转化甚至进一步减慢：72小时后仍保留约70％。吸附在腐殖酸涂层砂粒上的DBDPE的日照导致最慢的辐照速率。暴露96小时后，大约有88％的初始质量得以恢复。尽管母体化合物显示出缓慢的转化，但通过高效液相色谱（HPLC）进行的分析表明转化产物有些积累。

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