环境因素对铁与腐殖酸络合的影响。,Journal of Environmental Sciences

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环境因素对铁与腐殖酸络合的影响。
Journal of Environmental Sciences ( IF 5.9 ) Pub Date : 2015-01-20 , DOI: 10.1016/j.jes.2014.06.039
Kai Fang ₁ , Dongxing Yuan ₁ , Lei Zhang ₁ , Lifeng Feng ₁ , Yaojin Chen ₁ , Yuzhou Wang ₁

Affiliation

开发了一种尺寸排阻色谱结合紫外分光光度法和离线石墨炉原子吸收光谱法的方法，以评估水环境中铁（Fe）和腐殖酸（HA）的络合性能。研究了影响Fe和HA络合的因素，例如离子强度，pH，温度和UV辐射。还研究了Fe-HA复合物的停留时间。实验结果表明，pH可以影响HA的去质子和Fe的水解，从而影响Fe与HA的络合。NaCl的存在极大地破坏了络合物。温度对络合有一定影响。在高水平的紫外线辐射下，Fe-HA配合物的收率略有下降，但是可以忽略紫外线对自然水平下Fe-HA复合物形成的影响。络合达到平衡大约需要10个小时，Fe-HA络合物的停留时间约为20个小时。Fe和HA的络合在pH值为6的条件下，在黑暗中和约25°C的水温下10个小时达到最高离子强度时达到了最高水平。有人认为，Fe-HA复合物主要在淡水体内形成，在温暖的季节，在温和的日光辐射下会达到很高的水平。随着环境参数的变化，例如冬天的较低温度或河口的较高pH和离子强度，Fe-HA复合物的浓度会降低。Fe和HA的络合在pH值为6的条件下，在黑暗中和约25°C的水温下10个小时达到最高离子强度时达到了最高水平。有人认为，Fe-HA复合物主要在淡水体内形成，在温暖的季节，在温和的日光辐射下会达到很高的水平。随着环境参数的变化，例如冬天的较低温度或河口的较高pH和离子强度，Fe-HA复合物的浓度会降低。Fe和HA的络合在pH值为6的条件下，在黑暗中和约25°C的水温下10个小时达到最高离子强度时达到了最高水平。有人认为，Fe-HA复合物主要在淡水体内形成，在温暖的季节，在温和的阳光辐射下会达到很高的水平。随着环境参数的变化，例如冬天的较低温度或河口的较高pH和离子强度，Fe-HA复合物的浓度会降低。

"点击查看英文标题和摘要"

Effect of environmental factors on the complexation of iron and humic acid.

A method of size exclusion chromatography coupled with ultraviolet spectrophotometry and off-line graphite furnace atomic absorption spectrometry was developed to assess the complexation properties of iron (Fe) and humic acid (HA) in a water environment. The factors affecting the complexation of Fe and HA, such as ionic strength, pH, temperature and UV radiation, were investigated. The Fe-HA complex residence time was also studied. Experimental results showed that pH could influence the deprotonation of HA and hydrolysis of Fe, and thus affected the complexation of Fe and HA. The complexation was greatly disrupted by the presence of NaCl. Temperature had some influence on the complexation. The yield of Fe-HA complexes showed a small decrease at high levels of UV radiation, but the effect of UV radiation on Fe-HA complex formation at natural levels could be neglected. It took about 10 hr for the complexation to reach equilibrium, and the Fe-HA complex residence time was about 20 hr. Complexation of Fe and HA reached a maximum level under the conditions of pH 6, very low ionic strength, in the dark and at a water temperature of about 25°C, for 10 hr. It was suggested that the Fe-HA complex could form mainly in freshwater bodies and reach high levels in the warm season with mild sunlight radiation. With changing environmental parameters, such as at lower temperature in winter or higher pH and ionic strength in an estuary, the concentration of the Fe-HA complex would decrease.

更新日期：2019-11-01

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