Indicators - Analytical Chemistry (ACS Publications)

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V O L U M E 21, NO. 1, J A N U A R Y 1949

101

(59) Ketelle, B. H.. and Boyd, G. E., J . Am. Chem. SOC.,69, 2800 (1947). (60) Knauss, H. P., Science, 107, 324 (1948). (61) Kohman, T . P., Am. J . Phys., 15,356 (1947). (62) Krenz, F. H., Proc. Conf. Nuclear Chem., Chem. Inst. Can., Ottawa, p. 192, 1947. (63) Lattes, C. hl. G., Samuel, E. G., and Cuer, P., Anais acad. brasil cienc., 19, 1 (1947).

Lawrence, J . H.. and Hamilton, J. G., eds., “Advances in Biological and Medical Physics,” vol. 1, ?Jew York, Academic Press, 1948. iG5) Libby, W .F., J . Am. Chem. SOC.,69, 2523 (1947). (66) MacKenzie, A. J., and Dean, L. A4., A s a r , . CHEY., 20, 559 (64)

(1945). (ti71 lfcMillan, E. Jl.. Segrs, F,., Teller, E., Bloch, F., Williams, J.

H., Critchfield, C. L., Keisskopf, W. F., and Christy. R. F., “Lecture Series in Nuclear Physics,” Tashington,

Government Printing Office, 1947. 168) Mandeville, C. E., and Scherb, M. V., Siicleonicsr 3, No. 4, 2 (19481. (69) Mandeville, C . E., Scherb, M.V.,and Keighton, TV, B.. P h y s . Rea., 74, 601 (1948). (70) Marton, L.. and .Ibelson, P. H., Science. 106, 69 (1946). (71) Marton, L., and Abelson, P. H., Tech. Seuv Bull.. S a t l . Bur. Standards, 31, 85 (1947). 172) Mattauch, J., and Fluegge, S.,“Suclear Physics Tables,” New York, Interscience Publishers, 1946. (73) Meggers, W. F.. J . Optical SOC..4m.. 36,431 (1946). (74) Morrison, A . , Sucleonics, 3, Y o . 3, 45 (1948). ( 7 5 ) >foyer, B. J.. Peters, B., and Schmidt, F. H., P h y s . Rev.,69, 666 (1946): (MDDC 171). (76) Nag-Chowdhury, B. D., Das, Sudhansu. and Dasgupta, 8., Proc. S a t l . Inst. Sei. I n d i a , 10, 167 (1944). (77) Nag-Chowdhnry, B. D., and Monsuf, A . K., Ibid., 12, 341 (1946). (78) Ollano, Z . , Rend. ist. lombardo sci. classe sci. mat. nat., 71, 341 (1938). (79) Parker, H. M.,A-ucleonics, 3, No. 4,44 11948). (80) Perfilov, Y . .4., Compt. rend. acarl. sci., U.R.S.S., 42, 258 (1944). JVature, 161, 884 (1948). (81) Poole, J. H. J., and Bremner, J. W., (82) Powell, C. F.,Ihid., 160, 453,486 (1947). (83) Primakoff. H.. Nucleonics. 2. No. 1. 2 (19471 (84) Radin, N. S., Ibid., 1, No. ‘1, 24, No: 2, 48, No. 4, 51 (1947); 2, No. 1, 50, No. 2 , 3 3 (1948). (85) Rainwater, L. J., and Wu, C. S.,Ibid., 1, No. 2, 60 (1947).

(86) Reid, A. F., “Preparation and Measurement of Isotopic Tracers,” Ann Arbor, Mich.. J. W. Edwards, 1946. (87) Riedharnmer, 1.. Safitru~issenchaften, 32, 70 (1944)

(88) Koddis, L. H., ed., “Preparation and Measurement of Isotopes and Some of Their Medical Aspects,” Suppl. t o U. S. Naval

Medical Bull. (,March-Ami1 1948). (89) Russell, B., Sacks, D., Wattenberg; A., and Fields, R., Phys. Rev., 73, 545 (1948). (90) Sagane, R., Eguchi, M., and Shigeta, 6 . , J . Phys. Math. SOC. J a p a n , 16, 383 (1942). (91) Seaborg, G. T., Rea. NodernPhys., 16, 1 (1944). (92) SegrB, E., “SegrB Chart of Nuclear Properties,” Cambridge, Mass., Addison-Wesley Press, 1947. (931 Serber. R.. MDDC 306. (94) Seren, L., Friedlander, H. N.,and Turkel, S. H., MDDC 408 abs., and MDDC 613. (95) Seren, L., Friedlander, H. N., and Turkel, S.H., Phus. Rea., 72, 888 (1947). (96) Sherr, R., Rev. Sci. Instruments, 18, 767 (1947). (97) Smyth, H. D., “Atomic Energy for Military Purposes,” Princeton, N. J., Princeton University Press, 1945, U. S. (98)

(99) (100) (101) (102) (103)

Government Printing Office, Washington, D. C., 1945. Snell, A. H.. Science, 108, 167 (1948). Stevens, G. W.W., Sature, 162, 526 (1948). Studier, M.H., and IIJ de, E. K., Phys. Rea., 74, 591 (1948). Sue, P., and Martelly, J., Bull. soc. chim., 1946, 410. Szilard. L.. and Chalmers. T. A , . Sature. 134. 462 (1934). Thiers, R., Gravdon, W.,and Beamish, F. E., A N ~ LCHEM., . 20, 831 (1948).

S.Atomic Energy Commission, Isotopes Branch, Sucleonks, 1, No. 1, 64 (1947). (105) Victor, C. P., J . phys. radium, 8, 298 (1947). (106) Yon Ardenne, M., and Bernhard, F., Z . P h y s i k . , 122,740 (1944). (104) U.

(107) (108) (109) (110) (111) (112) (113) (114) (115) (116) (117) (118) (119)

Walker, R., MDDC-362. Way, K., etal., Xucleonics, 2, No. 5,82 (1948). Webb, J. H., Phys. Rev.,74, 511 (1948). Willard, J. E., J . Phys. & Colloid Chem., 52, 585 (1948). U’illiams, R. P., Jr., J . Chem. Phys., 16, 513 (1948). Wouters, L. F., Phys. Rea.,74, 489 (1948). Yaffe, L., and Justus, K. M., Ibid., 73, 1400 (1948). Yagoda, H., Nucleonics, 2, No. 5, 2 (1948). Yagoda, H., andKaplan, N., P h y s . Rev.,72, 356 (1947). Ibid., 73, 634 (1948). Ibid., 74, 1244 (1948). Yankwich, P. E., Science, 107, 681 (1948). Yankwich, P. E., Norris, T. H., and Huston, J., Ax.4~.CHEM.,

19, 439 (1947). (120) Yankwich, P. E., and Weigl, J.

W., Science, 107, 651 (1948).

RECEIVED December 9, 1948.

INDICATORS I. 31. KOLTHOFF Unicersity of Minnesota, Minneapolis, .Ifinn.

Q

UITE generally an indicator in chemistry io a substance which

indicates the presence of a certain constituent. I n this sense all the reagents which are used for the detection of a given constituent are indicators. I n a more limited sense an indicator is a substance which indicates the extent to which a reaction between two or more reactants occurs. I n volumetric analysis the