rous acid (for HO + C1) may be, it involves thefud of the existence of positive ch2oorine ioizs. It must be added that these views would have been published long ere this, if it had not been the hope of the author to report at the same time on other direct experimental confirmations of them. Circumstances have made it impossible to undertake before this the delicate work involved ; but in the ensuing year it is intended at least to study the behavior, of solutions of chlorine, hypochlorous acid, iodine chloride, etc., towards the electric current, in the hope of proving that, under suitable conditions, the migration of positive halogen ions to the negative pole will take place. Such a migration would decide the question, it seems to me, in the most direct and unquestionable fashion. I regret that the interesting paper of Professor Noyes and Mr. Lyons has made it necessary to publish these lines rather prematurely ; but their invitation for discussion encourages me to do so before the completion of my own experiments. rNIVERSITP OF CHICAGO, August 3. Igol THE PHOTOflETRIC DETERIllNATION OF SULPHATES.
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I. INTKODITTION 2 II. CHEMICAL MKTHOI) AND INVESTIGATION OF DIVERSE ION EFFECTS. .. 2 A. Selection of Analytical Method 2 U. Interference Effects-' < C. Analysis «if I'mniuui-Ftutoniutn Mixtures .1 D. Hi"miniH'i)ik'(l Analyst* Conditions for Various ('oinhinminns of t'nmiutu. PhiUmimn. and Chromium in Mixtures r > K. Aridity Effect 5 HI. tNSTRt'MENT DESCRIPTION fi A. (iencrni Oju'riHamol Ft'Mutw <5 }). Sample Tiling. Instntmcn! HMtmtoit. ;md Tsilw I'tisi>ionin$: Sdfniiitrannn ? C. (U>at:cni Oispensiut; Sysiem 7 I). Ey*victim; nntl Phase K. .'Mnt'T IV ACCTIUCY AND PKECISION K» AI'I'ENIHX A. PHKOPEKATlONAt. INSTltt'MENT ADft STMKNTS AND TKSTS. j:J APPENDIX H. Ol'EHATtONAI. 1'KOCEHntES FOR t'ttANtfM AND I't. DETEHXHNATI«>N I*' AI'I'KNDiX <• MECHANICAL COMPONENTS-•<» APPENDIX I). ELECTRICAL CONTROL CIHCITJUV M
LIST OF FIGURES 1. Automated controlled-potential coulometer 2. Control system schematic 3. Relays and mechanical components 4. Measurement station 5. Sample transport turntable 6. Cell-raising mechanism 7. Reagent-dispensing system 8. Cell and electrode cleaning system B-J. Typical graph of plutonium electrolysis 9 C-l. General instrument layout 11 C 2. Sample transport and ceil 12 C 3. Measurement station 13 C 4. Reagent dispensers 14 C-5. Pneumatic-hydraulic control system 15 C-6. Turntable lock 16 C-7. Reagent dispenser components 17 C 8. Miscellaneous supports 18 C 9. Measurement station supports 19 C 10. Services support panel 20 C-ll. Sample transport components 21 C 12. Turntable 22 C 13. Pneumatic-hydraulic interface 23 D-l. System connection 25 D-2. Wiring diagram 26 D-3. Interconnection chassis 27 D-4. Cables 28 D 5. Modification to coulometer 29 El. Sample program flow diagram 31 E-2. Electrical test program flow diagram 32 E 3. Blank program flow diagram 33 LIST OF TABLES El. Special-function keys listing E-JI. Electrical test program listing E-1I1. Blank program listing E-IV. Sample program listing AUTOMATED CONTROLLED POTENTIAL COULOMETER FOR PLUTONIUM DETERMINATION
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