  We consider the effects of the magnetic field on the frustrated phase states
of the dilute Ising chain, especially, the behavior of the magnetic entropy
change and the isentropic dependence of the temperature on the magnetic field,
which are the key parameters of the magnetocaloric effect. The found
temperature dependences of entropy demonstrate the nonequivalence of frustrated
phases in the antiferromagnetic and ferromagnetic cases. In the
antiferromagnetic case, the nonzero magnetic field at certain parameters causes
a charge ordering for nonmagnetic impurities at a half-filling, while in the
ferromagnetic case, the magnetic field reduces the frustration of the ground
state only partially. It is also shown, that impurities radically change the
magnetic Gr\"uneisen parameter in comparison with the case of a pure Ising
chain.
