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在不同照射时间、pH和溶解氧浓度下,研究了从加拿大魁北克省Rimouski河提取的黄腐酸(RRFA)在模拟太阳光照射过程中对苯并(α)芘结合性质的影响.结果表明,RRFA经模拟太阳光照射后,其与苯并(α)芘的结合系数KOC下降.光化过程中RRFA的相对分子质量或SUVA270与KOC之间有良好的指数回归关系.在pH 4.1~8.0范围内,以光照后的pH条件下测定照射样品的KOC,KOC平均下降47.4%±17.4%;以光照前的pH条件下测定照射样品的KOC,KOC平均下降48.7%±16.9%.溶解氧浓度的升高能加速RRFA的光氧化降解过程,与相应的未照射样品相比,空气饱和与氧气饱和条件下照射后的KOC分别下降30%和74%,氮气饱和条件下照射后的KOC升高122%. 相似文献
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Photochemical production of dissolved inorganic carbon from suwannee river humic acid 总被引:1,自引:0,他引:1
The photochemical mineralization of dissolved organic carbon(DOC) to dissolved inorganic carbon(DIC) is a key process in carbon cycling.Using a Suntest CPS solar simulator,Suwannee River humic acid(SRHA) was photooxidated to examine the effects of O2 levels,the wavelength of incident light,and the concentration of Fe on the photoproduction of DIC.Increasing the O2 abundance enhanced photodegradation of SRHA.The rate of DIC photoproduction under air saturation in the first 24 h(4.40 μmol/(L h)) was increased... 相似文献
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