Abstract:Desorption characteristics of phosphorus from different grain sizes micro-aggregate of sediment in Western Liao River was investigated by batch experiments of equilibrium desorption. Results indicated that order of desorption ratio was: clay (0.20)< silt (0.28)< fine sand (0.45)< coarse sand (0.93). On the one hand, humus content of fine-grained size was higher than coarse-grained size aggregate. On the other hand, organic matter of fine-grained size aggregate was enriched by complexes, which were dissoluble organic matter combined with clay mineral, and irreversible transformation of aggregate structure was fundamental cause of desorption ratio lower and hysteresis index higher. Furthermore, releasing flux of adsorption state phosphorus carried by clay and silt were (212.93±38.60)mg/kg and (159.45±31.44)mg/kg when sediment was washed from Western Liao River to the sea. Consequently, adsorption state phosphorus from clay and silt was a vital part of phosphorus cycling.
王而力, 王嗣淇, 王道涵. 西辽河沉积物中不同粒径微团聚体磷的解吸特征[J]. 中国环境科学, 2013, 33(4): 700-706.
WANG 而Li, WANG Si-Qi, WANG Dao-Han. Desorption characteristic of phosphorus from different grain sizes micro-aggregate of sediment in Western Liao River. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(4): 700-706.