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The chiral effective Lagrangian for pseudoscalar nonet is constructed inconsideration of isospin breaking. And the difference of quark condensates istaken accounted. The SU(3) singlet eta0 is not taken as Goldstone-boson. Themixing with and without isospin symmetry is considered. The quark mass ratiosare obtained through solving the mass equations of mesons. We estimate thechange of quark mass ratios according to the change of the masses of pion+ andkaon+ to see how the electromagnetic corrections affect our results. It turnout that massless up quark is possible. The upper limit for mu/md is around0.39. 2ms/(mu+md)=24.23~25.12. The values for quark condensate ratios and otherconstants are limited in narrow ranges.Comment: 10 page

QUARK MASS RATIOS AND MASS SPLIT OF π0-π±INChPTWITH THE DIFFERENCE OF QUARK CONDENSATES CONSIDERED

QUARK MASS RATIOS AND MASS SPLIT OF π⁰-π^±INChPTWITH THE DIFFERENCE OF QUARK CONDENSATES CONSIDERED