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By G. W. C. Milner, G. M. Phillips and R. J. Magee (Auth.)

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They obtained a relative standard deviation of 0-006%. DIFFERENTIAL COULOMETRIC TITRATIONS 53 References 1. MEYERS, R . J. and S W I F T , E. , J. Amer. Chem. Soc. 7 0 , 1 0 4 7 (1948). 2. T A Y L O R , J. K . a n d S M I T H , S. W . , / . Nat. 3. DEFORD, Bur. St. 6 3 A , 2 ( 1 9 5 9 ) . D . D . , J O H N S , C . J. a n d P I T T S , J. N . , Analyt. (1951). 4. REILLEY, C. N . , COOKE, W . D . a n d F U R M A N , N . H . , Analyt. (1951). 5. REILLEY, C. N . , A D A M S , R. N . and F U R M A N , 8.

4. The amperostat is put into operation by adjustment of R29 R* and R12 Electrolysis cell ww—@ anno Uy—. c. FIG. 4. Deford constant-current coulometric circuit. to give the required current, as shown by meter Ml9 or by measuring the potential drop across Rn. c. amplifier to vary. Since the amplifier is connected to the grid of the control valve (type 117L7), the anode current of this valve also varies. c. voltage applied to the circuit. Therefore any variation in the anode current varies inversely the voltage that falls across R2, Ml9 cell, R9 (R12\ Rio and Rn.

31, 1285 (1959). 14. SHULTS, W. D . , United States Atomic Energy Commission Report, ORNL 2921 (1960). 15. SHULTS, W. D . and THOMASON, P. , Analyt. Chem. 31,493 (1959). CHAPTER 3 Equipment and Technique for Constant-current Coulometry DUE to the inherent simplicity of equipment for constant-current coulometry, it is the usual practice for analytical chemists to construct their own apparatus from the following basic units: (1) a current source, (2) equipment for measuring the quantity of electricity, and (3) an electrolysis cell, including end-point indicating system.

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