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D. B. MoRELL, J, Barrett, P. Clezy and R. Lemberg 



Table 2. Ferrous haem a compounds 



?■ in m/', in parentheses emsi*- Reductant: dithionite.J 



• Concentration calculated as in Table 1 . 



t Haematin a cf. Table 1 . 



X A large excess of dithionite must be avoided. Reduction is somewhat slow. 



§ The solution must be saturated with CO (prepared from formic acid-sulphuric acid) before reduction. 



