Phosphite (HPO32-, H2PO3-, +3valence) is a reduced form of phosphorus in the biogeochemical phosphorus cycle. Its photooxidation process can be an important path of its transformation in water environment. The photooxidation process of 1μmol/Lphosphite in nitrate solution was studied using 300W mercury lamp as light source. Experiments were carried out to study the influences of NO3- concentration, pH value and common ions in water (such as Cl-, SO42-, HCO3-, Fe3+, Mn2+) and humic acid, on the photooxidation of phosphite in NO3- solutions. The results demonstrate that the photooxidation of phosphite followed the pseudo-first-order kinetics and the photooxidation rate increased rapidly with increasing initial NO3- concentration. The kinetics constant changed from 0.020h-1 to 0.271h-1 with the concentration of NO3- increased from 0 to 120μmol/L. The kinetics constant decreased with the increase of pH and the addition of HCO3-. The addition of Cl- and SO42- slightly inhibited the photooxidation process. The addition of Fe3+ accelerated the photooxidation of phosphite in NO3- solution while Mn2+ inhibited the photooxidation. The addition of humic acid inhibited the photooxidation process. ROS (reactive oxygen species) were found to play an important role in the phosphite photooxidation reaction by using isopropanol and sodium azide (NaN3) as ROS quenchers. In the simulated Taihu Lake water experiment, the increased amount of phosphate coincided with the decreased amount of phosphite, which indicated that the photooxidation product of phosphite is phosphate.
邱慧敏, 耿金菊, 韩超, 任洪强. 亚磷酸盐在硝酸根溶液中的光氧化过程及影响因素[J]. 中国环境科学, 2016, 36(5): 1442-1448.
QIU Hui-min, GENG Jin-ju, HAN Chao, REN Hong-qiang. Photooxidation process and its influencing factors of phosphite in nitrate solution. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(5): 1442-1448.
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