A clerk counts yuan bills at a bank in Huaibei, East China's Anhui province. [Photo/IC]

BEIJING - China's central bank injected 80.5 billion yuan ($12.12 billion) on Monday to maintain market liquidity.

The People's Bank of China (PBOC) pumped 130 billion yuan into the money market via seven-day reverse repos, a process by which central banks purchase securities from banks with an agreement to sell them back in the future.

The reverse repo was priced to yield 2.25 percent, according to a PBOC statement.

With 125 billion yuan of reverse repos and 75.5 billion yuan of central bank bills maturing on Monday, the PBOC effectively injected 80.5 billion yuan into the market.

On Monday's interbank market, the benchmark overnight Shanghai Interbank Offered Rate (Shibor) edged up 0.23 basis points to 2.0233 percent. The three-month Shibor continued a one-month losing streak to fall to 2.8028 percent.

The PBOC adopted various open market operations to regulate liquidity this year, including standing- and medium-term lending facility and pledged supplementary lending.