Prevention of copper and iron turbidities in wine

Joslyn, M; Lukton, A

Prevention of copper and iron turbidities in wine

Authors

M. A. Joslyn
Aaron Lukton

Authors Affiliations

M. A. Joslyn was Professor of Food Technology and Biochemist in the Agricultural Experiment Station, Berkeley; Aaron Lukton was Research Assistant in Food Technology, Berkeley.

Publication Information

Hilgardia 22(14):451-533. DOI:10.3733/hilg.v22n14p451. December 1953.

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Abstract

A search was conducted for a satisfactory substitute for potassium ferrocyanide in removing copper from wine to prevent formation of copper casse, at present the most important problem in wine stabilization. The most promising among the relatively nontoxic organic compounds tested was rubeanic acid. Cysteine and related sulfhydryl compounds and ascorbic acid precipitate excess copper, but further tests under winery conditions are needed. Aside from potassium ferrocyanide itself, the only other material that gave satisfactory results was an adsorption complex of potassium ferrocyanide and Prussian blue. Properly prepared and used—possibly with the addition of denatured protein—this complex would avoid contamination of the wine with ferrocyanide. Neither it nor rubeanic acid was as effective as the soluble ferrocyanide in removing iron from wine; but iron casses if troublesome might be dealt with by other means.

The rest of the materials tested—a number of organic chelating agents, calcium phytate, phytic acid, chlorophyll, and a number of ionexchange resins—were unsatisfactory either because they did not remove copper adequately or because they had an adverse effect on wine flavor. The results suggested, however, that it might be feasible to develop a special cation-exchange resin for this purpose.

The rate of formation and precipitation of copper rubeanate and of copper and iron ferrocyanides in wine was found to depend on the proportion of reagent used, the initial copper content, and the type of wine.

Sodium ethylenediaminetetraacetate was found to sequester copper and iron as soluble metal chelates in wine, but it did not bind them tight enough to prevent casse formation in some wines; and since it leaves a residue in the wine it does not appear to offer a practical solution to the casse problem.

Some tests were conducted on the corrosion of various metals with and without hard chrome-plating, when stored in wine under oxidizing and nonoxidizing conditions. The preliminary results indicated that such plating would reduce copper and iron pickup during wine processing and might be a practical means of salvaging corrodible winery equipment now in use.

Literature Cited

Amerine M. A., Joslyn M. A. Commercial production of table wines. California Agr. Exp. Sta. Bul. 1940. 639:1-143. (See p. 123-27.) https://archive.org/details/commercialproduc639amer

Table wines; the technology of their production in California 1951. p.xv + 397. (See p. 229-33, 259-60.) University of California Press, Berkeley, California

The Versenes 1952a. For: Exacting chemical control of cations in solution. Technical Bulletin no. 2, 4th ed. [102]. (See sec. I, p. 6-12/27-33; sec. IV, p. 1-2.) Bersworth Chemical Co., Framingham, Mass. Anonymous

Sequestrene 1952b. p.54. Technical Bulletin. (See p. 24.) Alrose Chemical Company, Providence, Rhode Island

The chemistry of the ferrocyanides. Cyanamid’s Nitrogen Chemicals Digest. 1953a. VII: New York, N.Y.: American Cyanamid Company. 112p.

Metal removal demonstration of Cufex. Wines and Vines. 1953b. 34(5):23

Austerweil G. V., P?cheur P. Application du pouvoir sélectif des échangeurs d’ions dans le traitement de certains liquides alimentaires. [Paris]. Acad. des Sci. Compt. Rend. 1951. 233:1190-91.

Autentrieth Wilhelm. Zur Kenntnis des gelben Blutlaugensalzes und über den Nachweis von Blausäure neben Ferrocyaniden. Arch. Pharm. 1893. 231:99 (Through: Chem. Centbl. 1893, I: 773.)

Bargues M. Amat. Mg(ClO₄)₂ and SiC in the study of ultrafiltration. Farmac. Nueva. 1942. 7:82-89. ’Also in: Chem. Centbl., II: 1211-12. (Through: Chem. Abs. 37: 5635; 1943.) 1942

Beck J. E., Pro M. J. Report on spectrophotometric determination of phosphates in wine. Assoc. Off. Agr. Chem. Jour. 1952. 35:257-60.

Bender M. The use of light scattering for determining particle size and molecular size and shape. Jour. Chem. Ed. 1952. 29:15-23. DOI: 10.1021/ed029p15 [CrossRef]

Berg Harold. Colorimetric copper determination. Wines and Vines. 1953. 34(2):27

Bersworth F. C. Carboxylic-substituted aliphatic amines and metallic salts thereof 1949. U. S. Patent No. 2,461,519; Feb. 15, 1949. See also: U. S. Patent No. 2,387,735; Oct. 30, 1945; and U. S. Patent No. 2,407,645; Sept. 17, 1946

Bhattacharya A. K. Composition of Prussian and Turnbull’s blues. II. Study of the constituents of their filtrates. Indian Chem. Soc. Jour. 1934. 11:325-30.

Composition of Prussian and Turnbull’s blues. iii. Indian Chem. Soc. Jour. 1935. 12:143-51.

Composition of Prussian and Turnbull’s blues. IV. Study of their adsorptive properties. Indian Chem. Soc. Jour. 1941a. 18:71-75.

Composition of Prussian and Turnbull’s blues. V. Rôle of hydrolysis and their compositions. Indian Chem. Soc. Jour. 1941b. 18:81-84.

Bhattacharya A. K., Dhar N. R. Composition of Berlin blue and Turnbull’s blue. Influence of adsorption on the composition. Ztschr. f. Anorgan. u. Allg. Chem. 1933. 213:240-48. (Through: Chem Abs. 27: 5020; 1933.)

Bhattacharya A. K., Gaur H. C. Physicochemical studies on the composition of complex metallic ferro- and ferricyanides. Indian Chem. Soc. Jour. 1948. 25:185-90.

Britton H. T. S., Dodd Eric N. Physicochemical studies of complex formation involving weak acids. VII. Hydroferrocyanic acid and the precipitation of ferrocyanides of silver, lead, copper, zinc, cadmium, cobalt, nickel, and manganese. Chem. Soc. [London] Jour. 1933. 1933:1543-46. DOI: 10.1039/jr9330001543 [CrossRef]

Brown J. G. A note on the removal of iron from grape juice by means of potassium ferrocyanide. Fruit Prod. Jour. 1932. 11:274-75.

Burdick G. E., Lipschuetz M. Toxicity of ferro- and ferricyanide solutions to fish, and determination of cause of mortality. Amer. Fisheries Soc. Trans. 1948. 78:192-202. DOI: 10.1577/1548-8659(1948)78[192:TOFAFS]2.0.CO;2 [CrossRef]

Cannan R. Keith, Kibrick Andre. Complex formation between carboxylic acids and divalent metal cations. Amer. Chem. Soc. Jour. 1938. 60:2314-20. DOI: 10.1021/ja01277a012 [CrossRef]

Casale L. La casse ferrica del vino. R. Staz. Enol. Sper. di Asti Ann., ser. II. 1934. 1:1 + 342 (See p. 3-72, 73-100.) Scuola Tip. S. Giuseppe, Asti

Castella F. de. Casse. Wine defects not directly caused by microörganisms; maturation of wine. Victoria Dept. Agr., Bul. new ser. 1925. 48:1-52.

Center E. John, MacIntosh Robert M. Spectrophotometric determination of small amounts of copper using rubeanic acid. Indus. and Engin. Chem. analyt. ed. 1945. 17:239-40. DOI: 10.1021/i560140a014 [CrossRef]

Chaudbury S. G., Chatterjee N. P. Effect of non-electrolytes on the coagulation of colloids. Part III. Cupric ferrocyanide sol. Jour. Phys. Chem. 1929. 33:244-49.

Cohee R. F. Jr., Steffen George. Takes heavy metals out of acid foods. Food Indus. 1949. 21:1746-48. 1895

Cordonnier R. [Removal of iron from white wine by calcium phytate (added for clearing purposes) and comparison with the treatment with potassium ferrocyanide]. Ann. Fals. et Fraudes. 1952. 45:415-26. (Through: Chem. Abs. 47:4036-37; 1953.)

Couerbe Emile. Le collage bleu. Nécessité vitale de son emploi en œnologie. 1949. 4 Rue Clauzel, Algeria: Edité par l’Institute Œnophylia. 124p.

Coulson E. J. Report on copper. Assoc. Off. Agr. Chem. Jour. 1937. 20:178-88.

Cruess W. V. The principles and practices of wine making 1947. 2d ed.p.476. (See p. 308-19.) Avi Publishing Co., New York, N.Y

Davidson David. The Prussian blue paradox. Jour. Chem. Ed. 1937a. 14:238-41. DOI: 10.1021/ed014p238 [CrossRef]

The formulation of Prussian blue. Jour. Chem. Ed. 1937b. 14:277-81. DOI: 10.1021/ed014p277 [CrossRef]

Davidson David, Welo L. A. The nature of Prussian blue. Jour. Phys. Chem. 1928. 32:1191-96. DOI: 10.1021/j150290a007 [CrossRef]

Doty P., Edsall J. T. Light scattering in protein solutions. Adv. in Protein Chem. 1951. 6:35-121. DOI: 10.1016/S0065-3233(08)60502-1 [CrossRef]

Drabkin D. L. Report on copper. Assoc. Off. Agr. Chem. Jour. 1939. 22:320-33.

Emeléus H. J., Anderson J. S. Modern aspects of inorganic chemistry 1938. p.xi + 536. (See p. 116, 137.) D. Van Nostrand Co., New York, N.Y

Felton George E. Ion exchange application by the food industry. 1949. 2:1-46. Mrak, E. M., and George F. Stewart. Advances in food research. vol. xii + 558 p. Academic Press Inc., New York, N.Y DOI: 10.1016/S0065-2628(08)60040-3 [CrossRef]

Fessler Julius H. The present status of blue-fining. Fruit Prod. Jour. 1949. 28:167-69. 171, 187, 189

Development of the Fessler compound. Wines and Vines. 1952. 33(7):15-16.

Fisher F. B., Brown J. S. Colorimetric determination of cyanide in stack gas and waste water. Analyt. Chem. 1952. 24:1440-44. DOI: 10.1021/ac60069a014 [CrossRef]

Fontanelli G. [Potassium ferrocyanide in clarification of wines containing iron.]. Pisa Univ., Facoltà Agrar., Ann. 1947. 8:108-17. (Through: Chem. Abs. 42: 9068; 1948.)

Fordham Stanley, Tyson John T. The structure of semipermeable membranes of inorganic salts. Chem. Soc. [London] Jour. 1937. 1937:483-87. DOI: 10.1039/jr9370000483 [CrossRef]

Garino-Canina E. Devesi ammettere l’impiego in enologia del ferrocianuro di potassio? VIII Cong 1950a. Internaz. Indus. Agrar., Bruxelles, Atti. (Reprint, 12 p. Scuola Tipografia San Guiseppe, Asti.)

Demetallizzazione del vino con resine seambiatrici 1950b. pp.10-12. VIII Cong. Internaz. Indus. Agrar., Bruxelles, Atti

L’uso degli scambiatori ionici nella moderna tecnica enologica 1951. Cong. Internaz. di Chim., Algeri, Atti, 8 p. (Reprint, 10 p. Scuola Tipografia San Guiseppe, Asti.)

Green Henry, Fullam Ernest F. Some applications of the high resolving power of the electron microscope. Jour. Appl. Phys. 1943. 14:332-40. DOI: 10.1063/1.1714994 [CrossRef]

Greenwood C. T. The size and shape of some polysaccharide molecules. Adv. in Carbohydrate Chem. 1952. 7:290-332. DOI: 10.1016/S0096-5332(08)60087-9 [CrossRef]

Gucker Frank T. Jr., O’Konski Chester T., Pickard Hugh B., Pitts James N. Jr. A photoelectronic counter for colloidal particles. Amer. Chem. Soc. Jour. 1947. 69:2422-31. DOI: 10.1016/0095-8522(49)90052-5 [CrossRef]

Gucker Frank T. Jr., Pickard Hugh B., O’Konski Chester T. A photoelectric instrument for comparing the concentrations of very dilute aerosols, and measuring low light intensities. Amer. Chem. Soc. Jour. 1947. 69:429-38.

Hazel Fred, Sorum C. H. Preparation of negative colloidal ferric oxide by hydrolysis of Prussian blue. Amer. Chem. Soc. Jour. 1930. 52:1337-40. DOI: 10.1021/ja01367a005 [CrossRef]

Heide C. von der. Die Blauschönung. Wein u. Rebe. 1933. 14:325-35. 348-59, 400-8; 15:35-44

Hendrix Byron M. The resorption of copper and ferrocyanide ions by coagulated proteins. Jour. Biol. Chem. 1928. 78:653-60.

Hennig K. Einige Fragen zur Bilanz der Stickstoffverbindungen im Most und Wein. Ztschr. der Lebensmtl.-Untersuch. u. Forsch. 1944. 87:40-48. DOI: 10.1007/BF02428885 [CrossRef]

Holtzman Harris. Alkali resistance of the iron blues. Indus. and Engin. Chem. 1945. 37:855-61. DOI: 10.1021/ie50429a019 [CrossRef]

Hubach C. E. Detection of cyanides and ferrocyanides in wines. Analyt. Chem. 1948. 20:1115-16. DOI: 10.1021/ac60023a040 [CrossRef]

Hummel Frances Cope, Willard H. H. Determination of iron in biological materials. The use of o-phenanthroline. Indus. and Engin. Chem., analyt. ed. 1938. 10:13-15.

Jaulmes Paul. Analyse des vins. 1951. 2d ed. Montpellier, France: Librairie Poulain. 574p.

Johnson John R. Modern electronic concepts of valence 1938. pp.1595-1711. (See p. 1637-53.) In: Gilman, Henry. Organic chemistry. 2 vols. lvi + 1890 p. John Wiley &; Sons, Inc., New York, N.Y

Joslyn M. A. Hard chrome plating and avoidance of metal pick-up. Wines and Vines. 1950. 31(4):67-69.

Joslyn M. A., Amerine M. A. Commercial production of dessert wines. California Agr. Exp. Sta. Bul. 1941. 651:1-186. (See p. 147-49.) https://archive.org/details/commercialproduc651josl

Joslyn M. A., Lukton A., Cane A. The removal of excess copper and iron ions from wine. Food Tech. 1953. 7:20-29.

Justin-Mueller . La constitution des bleues de Prusse et de Turnbull. Soc. Chim. de France. 1931. 49:1285-89.

Kanning E. E., Campbell A. W. The adsorption of potassium ferrocyanide and ferric sulfate by Prussian blue. Indiana Acad. Sci. Proc. 1939. 49:94-100.

Keggin J. F., Miles F. D. Structure and formulae of the Prussian blues and related compounds. Nature. 1936. 137:577-78. DOI: 10.1038/137577a0 [CrossRef]

Kielhöfer E. Troubles albuminöides du vin. Off. Internatl. du Vin Bul. 1942. 16(152):7-10.

Die Eiweisstrübung der 1947er Weine. Der Weinbau, Wiss. Beihefte. 1948. 2:233-40.

Die Eiweisstrübung der 1947er Weine. Der Weinbau, Wiss. Beihefte. 1949. 3:10-17. 33-39

Die Eiweisstrübung des Weines. IV Über die Beschaffenheit des Trubes und die Verminderung des N-Gehaltes des Weines durch die Trubabscherdung. Ztschr. der Lebensmtl.-Untersuch. u. - Forschung. 1951. 92:1-9.

Kirk K. L., Stenhouse N. S. Ability to smell solutions of potassium cyanide. Nature. 1953. 171:698-99. DOI: 10.1038/171698b0 [CrossRef]

Krum Jack, Fellers Carl R. Clarification of wine by a sequestering agent. Food Tech. 1952. 6:103-6.

Kruse J. M., Mellon M. G. Colorimetric determination of cyanide and thiocyanate. Analyt. Chem. 1953. 25:446-50. DOI: 10.1021/ac60075a018 [CrossRef]

Kukharenko T. A. [The reaction of humic acid with salts of the heavy metals]. Jour. Appl. Chem. (U. S. S. R.). 1946. 19:187-95. (Through: Chem. Abs. 41: 404; 1947.)

Kunin Robert, Myers Robert J. Ion exchange resins. 1950. New York, N.Y.: John Wiley &; Sons, Inc. xi + 212p. DOI: 10.1021/ja00861a035 [CrossRef]

Marsh George L. Metals in wine. Wine Rev. 1940. 8(9): 12-13, 24; (10):24-29.

Copper determination. Commercial production of dessert wines. California Agr. Exp. Sta. Bul. 1941. 1 Joslyn M. A. Amerine M. A. 186. 651:163-66 https://archive.org/details/commercialproduc651josl

Report on the Fessler compound. Wines and Vines. 1952. 33(6):20-21.

Marsh Geo. L., Nobusada K. Iron determination methods. Wine Rev. 1938. 6(6):20-21.

Martell Arthur E., Calvin Melvin. The chemistry of the metal chelate compounds. 1952. New York, N.Y.: Prentice-Hall Co. xi + 613p. DOI: 10.1097/00010694-195211000-00010 [CrossRef]

McBain J. W. Colloid science 1950. p.450. (See p. 82-83.) D. C. Heath and Company, Boston, Mass DOI: 10.1097/00010694-195011000-00012 [CrossRef]

Michaelis L., Smythe C. V. The correlation between rate of oxidation and potential in iron systems. Jour. Biol. Chem. 1931. 94:329-40.

Miconi Carlo. [Wine treatment with potassium ferrocyanide]. Riv. Viticolt. e Enol. (Corregliano). 1948. 1:275-83.

Miller Benjamin F., Winkler Alexander. The ferrocyanide clearance in man. Jour. Clin. Invest. 1936. 15:489-92. DOI: 10.1172/JCI100798 [CrossRef]

Mrak E. M., Cash L., Caudron D. C. Effects of certain metals and alloys on claret- and sauterne-type wines made from vinifera grapes. Food Res. 1937. 2:539-47. DOI: 10.1111/j.1365-2621.1937.tb17826.x [CrossRef]

Mrak E. M., Caudron D. C., Cash L. Corrosion of metals by musts and wines. Food Res. 1937. 2:439-54. DOI: 10.1111/j.1365-2621.1937.tb16535.x [CrossRef]

Nasledov Sergei N. Metal clouding in wines. Wine Rev. 1949. 17(10):10-11.

Negre E., Cordonnier R. [Potassium ferrocyanide and calcium phytate]. Prog. Agr. et Vit. 1952. 138:35-37. (Through: Chem. Abs. 47: 267; 1953.)

Nelson G. H., Levine M., Lynch D. F. J. Removal of iron by lignin in water treatment. Paper Trade Jour. 1939. 108(9):29-32.

Neuberg Carl, Roberts Irene S. Remarkable properties of nucleic acids and nucleotides. Arch. Biochem. 1949. 20:185-210.

Oster G. The scattering of light and its application to chemistry. Chem. Rev. 1948. 43:319-65. DOI: 10.1021/cr60135a005 [CrossRef]

Universal high-sensitivity photometer. Anal. Chem. 1953. 25:1165-69. DOI: 10.1021/ac60080a006 [CrossRef]

Pauling L. The nature of the chemical bond and the structure of molecules and crystals 1939. p.xiv + 429. (See p. 234-36.) Cornell University Press, Ithaca, New York

Peacock J. M., James J. C. Ion association in aqueous solutions of metal decarboxylates. Chem. Soc. [London] Jour. 1951. 1951:2233-39. DOI: 10.1039/jr9510002233 [CrossRef]

Pecsock Robert L. The Versene complexes. Jour. Chem. Ed. 1952. 29:597-99. DOI: 10.1021/ed029p597 [CrossRef]

Polarography of copper in ethylenediaminetetraacetic acid solutions. Analyt. Chem. 1953. 25:561-64. DOI: 10.1021/ac60076a007 [CrossRef]

Pedersen C. J. Inhibition of deterioration of cracked gasoline during storage. Indus. and Engin. Chem. 1949. 41:924-28.

Pedersen Kai Julius. The uncatalyzed and the metal-ion-catalyzed decarboxylation of oxaloacetic acid. Acta Chem. Scand. 1952. 6:285-303. DOI: 10.3891/acta.chem.scand.06-0285 [CrossRef]

Pro M. J. Report on spectrophotometric determination of tannin in wines and brandies. Assoc. Off. Agr. Chem. Jour. 1952. 35:255-57.

Rabinerson A. I., Vladimirskaya M. A. [Mitogenetic radiation in the course of the formation of slightly soluble precipitates]. Acta Physicochim. (U. R. S. S.). 1939. 10:859-66. (Through: Chem. Abs. 33: 8120; 1939.)

Ramage W. D. Process for purification of beverages 1938a. U. S. Patent No. 2,105,700; Jan. 18, 1938

Process for clarification and removal of iron from beverages 1938b. U. S. Patent No. 2,128,432; Aug. 30, 1938

Process for removal of metallic impurities from wines and other beverages 1941. U. S. Patent No. 2,258,216; Oct. 7, 1941

Rây P., Bagchi P. N. Complex compounds of biguanide with bivalent metals. Part I. Copper biguanidines. Indian Chem. Soc. Jour. 1939. 16:617-20.

Rây P., Rây R. M. Metallic compounds of rubeanic acid. Indian Chem. Soc. Jour. 1926. 3:118-26.

Rây P., Shiddhanta S. K. Complex compounds of biguanide with bivalent metals. Part V. Copper and nickel metaphenylenedibiguanidines and their salts. Indian Chem. Soc. Jour. 1943. 20:200-2.

Reihlen H., Zimmerman W. Prussian blue and complex metallic cyanides. Ann. der Chem. (Liebig’s). 1927. 451:75-105.

Rentschler H., Tanner H. Über die Kupfersulfit-Trübung von Weissweinen und Süssmosten. Schweiz. Ztschr. für Obst- und Weinbau. 1951. 60(16):298-301.

Ribéreau-Gayon J. Sur les matières albuminöides des vins blancs. Ann. des Falsif. 1932. 25:518-24. 602-9

Contribution à l’étude des oxydations et réduction dans les vins. 1933a. 2d ed. France: Delmas, Bordeaux. 213p.

Etats, réactions, équilibres et précipitations du fer dans les vins. Casses ferriques. 1933b. France: Delmas, Bordeaux. 102p.

Ribéreau-Gayon J. Collage bleu. Traitement des vins par le ferrocyanure. Complexes dur fer dans les vins. 1935a. France: Delmas, Bordeaux. 42p.

Le cuivre des moûts et des vins. Ann. des Falsif. 1935b. 28:349-60.

Traité d’œnologie 1947. p.546. (See p. 163-81.) Librairie Polytechnique Ch. Béranger, Paris, France

Rigamonti Rolando. [The structure of cupriferrocyanides. I. Copper ferrocyanide and potassium copper ferrocyanides]. Gazz. Chim. Ital. 1937. 67:137-46. (Through: Chem. Abs. 31: 6574; 1937.)

[The structure and chemical constitution of some ferrocyanides. The structure of cupriferrocyanides]. Gazz. Chim. Ital. 1938. 68:803-9. 809-16. (Through: Chem. Abs. 33: 4152; 1939.)

Rollier Mario A., Arreghini Enrico. [The structure of copper salts of some complex cyanic compounds. I. The structure of copper salts of hexacyanides of cobalt and chromium]. Gazz. Chim. Ital. 1939. 69:499-508. (Through: Chem. Abs. 34: 1578; 1940)

Rossi M. A. Jr. Report on chrome plating 1951. p.212. Amer. Soc. Enol. Proc., 2d ann. open meeting, Davis, California, Aug. 8-10, 1951. (See p. 192-200.) (Mimeo.)

Ruben S., Frenkel A. W., Kamen M. D. Experiments on chlorophyll and photosynthesis using radioactive tissues. Jour. Phys. Chem. 1942. 46:710-14.

Sandell E. B. Colorimetric determination of traces of metals 1944. p.xvi + 487. (See p. 220.) Inter-science Publishers Inc., New York, N.Y DOI: 10.1097/00010694-195103000-00016 [CrossRef]

Saywell Lawrence G. Clarification of vinegar. Indus. and Engin. Chem. 1934a. 26:379-85. DOI: 10.1021/ie50292a005 [CrossRef]

Clarification of wine. Indus. and Engin. Chem. 1934b. 26:981-83. DOI: 10.1021/ie50297a018 [CrossRef]

Saywell L. G., Cunningham B. Determination of iron. Colorimetric o-phenanthroline method. Indus. and Engin. Chem., analyt ed. 1937. 9:67-69.

Scull R. S. Observations on use of stainless steel and chromium plating for the food industry. Fruit Prod. Jour. 1949. 28:179-81. 188

Searle H. E., LaQue F. L., Dohrow R. H. Metals and wines. Indus. and Engin. Chem. 1934. 26:617-27. DOI: 10.1021/ie50294a008 [CrossRef]

Sinclair Walton B., Ramsey R. C. The picric acid method for determining minute amounts of hydrocyanic acid in fumigated insects. Hilgardia. 1944. 16(6):291-300. DOI: 10.3733/hilg.v16n06p291 [CrossRef]

Smythe C. V. The mechanism of iron catalysis in certain oxidations. Jour. Biol. Chem. 1931a. 90:251-65.

The titration of hydroxy organic acids in the presence of ferric and cupric salts. Jour. Biol. Chem. 1931b. 92:233-44.

Smythe C. V., Schmidt Carl L. A. Studies on the mode of combination of iron with certain proteins, amino acids, and related compounds. Jour. Biol. Chem. 1930. 88:241-69.

Stotz E., Harrer C. J., King C. G. A study of “ascorbic acid oxidase” in relation to copper. Jour. Biol. Chem. 1937. 119:511-22.

Sumner James B. A method for the colorimetric determination of phosphorus. Science. 1944. 100:413-14. DOI: 10.1126/science.100.2601.413 [CrossRef]

Sutra G. [The dimensions of ions of electrolytes. I. Aqueous solutions. Hydration of ions]. Jour. de Chim. Phys. et de Physiochim. Biol. 1946. 43:189-204. (Through: Chem. Abs. 41:7226-47.)

Thompson J. B., Kocher R. B., Fritzche H. W. A browning reaction involving copper proteins. Arch. Biochem. 1948. 18:41-49.

Trevor John S. Ion exchange resins. Food. 1949a. 18:212 215

Organic sequestering agents. Food. 1949b. 18:345

Van Slyke Donald D., Hiller Alma, Miller Benjamin F. The clearance, extraction percentage and estimated filtration of sodium ferrocyanide in the mammalian kidney. Comparison with inulin, creatinine and urea. Amer. Jour. Physiol. 1935a. 113:611-28.

The distribution of ferrocyanide, inulin, creatinine, and urea in the blood and its effect on the significance of their extraction percentages. Amer. Jour. Physiol. 1935b. 113:629-41.

Waal H. L. de. ’n Ondersoek omtrent die gehalte aan swaar metale van Suid-Afrikanse wyne. en die behandeling van wyn met kaliumferrosianede. [English summary]. Stellenbosch Univ. Ann., Ser. A. 1932. 10:1-50.

Watson R. W., Tom J. B. Relation of structure and effectiveness in copper deactivators. Indus. and Engin. Chem. 1949. 41:918-23. DOI: 10.1021/ie50473a010 [CrossRef]

Weimarn P. P. von. The precipitation laws. Chem. Rev. 1925. 2:217-42.

Weiser Harry Boyer. Inorganic colloid chemistry. Vol. III. The colloidal salts 1938. p.viii + 473. (See p. 275, 307.) John Wiley &; Sons, New York, N.Y

A textbook of colloid chemistry 1939. 2d ed.p.444. (See p. 216.) John Wiley &; Sons, New York, N.Y

Weiser Harry Boyer, Milligan W. O. Constitution of inorganic gels. 1942. 1:227-46. Kraemer, Elmer O., Floyd E. Bartell, and S. S. Kistler. Advances in colloid science. vol. xii + 434 p. Interscience Publishers, Inc., New York, N.Y

Weiser Harry Boyer, Milligan W. O., Bates J. B. X-ray diffraction studies on heavy metal ferrocyanide gels. Jour. Phys. Chem. 1938. 42:945-54.

The iso-thermal dehydration of heavy metal iron cyanides. Jour. Phys. Chem. 1941. 45:701-6. DOI: 10.1021/j150409a013 [CrossRef]

X-ray diffraction studies on heavy metal iron-cyanides. Jour. Phys. Chem. 1942. 46:99-111. DOI: 10.1021/j150415a013 [CrossRef]

Williams R. J. P. Metal-ion catalysis of the decarboxylation of oxalo-acetic acid. Nature. 1953. 117:304-5. DOI: 10.1038/171304b0 [CrossRef]