The energy matrices for combined crystal field-spin orbit perturbation of the d1 and d9 configurations in trigonal bipyramidal environment have been constructed. Basis functions are selected according to thŵ eakand strong-crystalline-field approximations, and the generalized D>(a, ß, y) rotation matrices for angularmomenta eigenfunctions (js/2,5/2; 4/2, 2) are constructed and used to determine their transformation properties. The crystal-field matrix elements are expressed in terms of the parameters Dq and Db. Secular determinants resulting from either approximation are equivalent and indicate perturbation of the d orbitals into five energy levels. Spacing between these energy levels depends on the relative magnitudes of crystallinefield parameters and spin-orbit coupling constants, so in their generalized forms, the energy matrices are applicable to any d1 or d9 configuration in trigonal bipyramidal environment.

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2,4,6-Tripyridyl-s-triazine (TPTZ) is a color reagent for ferrous ion in the pH range 2 to 10, when ascorbic acid is used as the reducing agent. In this range TPTZ and ferrous ion combine in the ratio of two to one. Tris buffer is commonly used to maintain an alkaline pH, but it reacts with other reducing agents, rendering them ineffective. These observations suggested a method for the joint determination of serum iron and total iron-binding capacity (TIBC), all done in a single tube and with one color reagent. The method is compared with those of Peters et al. The standard deviation of the difference between the serum iron methods is less than 6 µg/100 ml, between the TIBC methods, less than 19 µg/100 ml.

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