Disclosed are: a microorganism capable of degrading diphenylarsinic acid; a method for degrading diphenylarsinic acid by using the microorganism; a method for clean-up of a contaminated soil by using the microorganism; an agent for degrading diphenylarsinic acid, which comprises the microorganism; and a cleaning agent for a contaminated soil or groundwater, which comprises the microorganism. Specifically disclosed are: a microorganism belonging to the genus Sinorhizobium and capable of degrading diphenylarsinic acid; a microorganism belonging to the genus Ensifer and capable of degrading diphenylarsinic acid; a method for clean-up of a contaminated soil by using the microorganism; an agent for degrading diphenylarsinic acid, which comprises the microorganism; and a cleaning agent for a contaminated soil or groundwater, which comprises the microorganism.

 
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