We investigate thermodynamic properties of CuSe2O5 at high magnetic fields.
The behavior of CuSe2O5 above Neel temperature (TN) is like spin chains.
This compound above TN is described by1D spin-1/2 XXZ Heisenberg model.
There is one quantum critical field in this compound at Hc=2300 K Oe.
Indications on thermodynamic curves confirm the event of such a phase transition.
Wilson ratio (Rw) at fixed temperature remains almost constant in the LL phase.
Rw exhibits anomalous enhancement near the quantum critical field.