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Effect of organo–mineral complexes on adsorption characteristic of phosphorus on sediment |
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Abstract Effect of organo–mineral complexes on adsorption characteristic of phosphorus on sediment was investigated by batch experiments of equilibrium adsorption. Results indicated that the sorption capacity on the sediment reduced dramatically after humus was removed, Normalized sorption capacity and partition coefficient only accounted for 35.62% and 9.93% of original sample, and organo–mineral complexes was a main factor in phosphorus sorption on sediment.The normalized carbon sorption capacity of Ca-bound humus was 1157.05mg/kg, which was 1.27 times of original sample, and adsorption mechanism was micro-hole function filling. The normalized carbon sorption capacity of Fe/Al-bound humus was 1736.82mg/kg, which was 1.88times of original sample, It plays an important role in phosphorus adsorption, and adsorption mechanism may be coordination adsorption apart from micro-hole function filling. Taking into account the adsorption capacity was not only organic matter content, but also existent state of organic matter, and it was also a main factor in sorption characteristic of phosphorus on sediment. When regarding original sample as a basic standard, adsorption capacity of phosphorus on Ca bound humus and Fe/Al bound humus were estimated in accordance with 1.27and 1.88 times.
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Received: 15 May 2012
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