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• 基金项目：国家“八五”攻关项目

• 王春霞
• 中国科学院生态环境研究中心,环境水化学国家重点实验室,北京 100085

• 彭安
• 中国科学院生态环境研究中心,环境水化学国家重点实验室,北京 100085

• PH. Schmitt
• GSF-Forschungszentrum fur Umwelt and Gesundheit GmbH,Institut fur Okologische Chemie, Germany

• N. Hertkorn
• GSF-Forschungszentrum fur Umwelt and Gesundheit GmbH,Institut fur Okologische Chemie, Germany

• 摘要：为探讨腐殖酸在环境中的行为及光解除去腐殖酸的可能性,利用大于290nm的模拟日光辐照,探讨了大骨节病病区、非病区腐殖酸和泥炭腐殖酸的光解过程和光解机理及过氧化氢对其光解的影响,发现随着光照时间的延长,腐殖酸水体系的总有机碳(TOC)含量降低,pH值下降,过氧化氢可以促进腐殖酸的光解,其光解过程遵循一级动力学规律。计算了不同来源腐殖酸光解的速率及光解半衰期,发现土壤和泥炭腐殖酸比大骨节病病区饮水中腐殖酸光解速率快,光解半衰期短。用富利叶红外(FT-IR)和高效毛细管电泳,分析了部分腐殖酸光解的残留混合物,发现其仍保持了腐殖酸的基本结构特征,但具有更大的分散性。

• Abstract：To study the evnironmental behavior of fulvic acid (FA) and the possibility of removing FA in potable water, imitate sunlight above 290 nm was used. The process and mechanism of the photodegradation of FAs from Kaschin-Beck disease (KBD) prone areas and non-KBD areas, the influences of hydrogen peroxide (H₂O₂) on the FA degradation were investigated. With the increase of sunshine time, the total organic carbon (TOC) and the PH value of FA solution decreased. H₂O₂ enhance the FA photodegradatio rate significantly. The process of FA photodegradation follow the pseudo-first order dynamic law. Photodegradation rate and half-life of FAs from different origins were calculated. FAs from soil and peat photedegraded faster than FAs from potable water of KBD areas. Photodegradation residus of FAs were analyzed by Fourier-transform infrared spectrometry and high performance capillary electrophoresis.

• Key words：fulvic acid  photodegradation  hydrogen peroxide

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