Kinetics and mechanism of complexation reactions of (i) Ni(II), Co(II), Cd(II)-L-histidine (ii) Co(II), Ni(II)-L-tyrosine(iii) Ni(II), Co(II), Cd(II)-DL-aspartic acid (iv) Ni(II)-L-glutamine(V) Ni (II)-L-serine, L-leucine, L-alanine
