Hydrolysis of an organophosphate ester by manganese dioxide

被引:53
作者
Baldwin, DS
Beattie, AK [1 ]
Coleman, LM
机构
[1] Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia
[2] CRC Freshwater Ecol, Albury, NSW 2640, Australia
[3] Murray Darling Freshwater Res Ctr, Albury, NSW 2640, Australia
[4] EWL Sci, Winnellie, NT 0821, Australia
关键词
D O I
10.1021/es001309l
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Amorphous manganese dioxide facilitates the hydrolysis of p-nitrophenyl phosphate to p-nitrophenol and orthophosphate despite insignificant adsorption of p-nitrophenyl phosphate or p-nitrophenol to the manganese dioxide. At pH 8, the orthophosphate product is released into solution; at pH 4 and pH 6, some remains adsorbed. The rate of hydrolysis is an order of magnitude more rapid than the same reaction facilitated by iron oxides. Because manganese dioxides are ubiquitous components of soils and sediments, this suggests the possibility of significant abiotic pathways for the formation of bioavailable orthophosphate from phosphate ester precursors.
引用
收藏
页码:713 / 716
页数:4
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