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Problems posed by the automation of the Winkler method for the potentiometric determination of dissolved oxygen
768
OLR(1979)26(12)
79:5916 Yoshida, Kozo, 1977. Physical oceanography in Japan: some topics on the activities during the last
ten to twenty years [1957-1977]. Rec. Prog. nat. Sci. Japan, 2: 73-82.
B. CHEMICAL OCEANOGRAPHY
1. Apparatus and methods 79:5917 Bikbulatov, E. S. and V, M. Vereshchagin, 1979. A reagent for the determination of nitrites in natural waters. (In Russian.) Okeanologiia. 19(2): 341-343. Tests of different sulfa drugs with respect to their azo coupling with 1-naphthylamine have shown that the maximum yield of azo dye is obtained when dissolved streptocide is used. Based on this reaction, a method of determining nitrites in fresh and sea water has been developed which is simpler than the well-known Benshneider-Robinson method and more sensitive than the Griss-llosvy method. 79:5918 Carsin, J. L. and A. Paltry, 1978. Problemes poses par l'automatisation du dosage potentiom6trique de l'oxygene dissous dans la methode de Winkler. [Problems posed by the automation of the Winkler method for the potentiometric determination of dissolved oxygen.] Annls hydrogr., (5)6(2)(749): 19-25. The determination of dissolved oxygen concentration by end point potentiometry in the Winkler method is a semi-automatic process. It is possible to remove the need of an operator's intervention between two titrations by fitting the automatic burette and titrator together with a sampler and tape-recording computer. Contact of the solution with air oxygen must be avoided during the interval between sampling and titration: any error is revealed by comparing the thiosulfate quantities used. The automation of the Winkler method can only be applied to samples at 3oC. 79:5919 Hodge, V. F., S. L. Seidel and E. D. Goldberg, 1979. Determination of tin (IV) and organotin compounds in natural waters, coastal sediments and macro algae by atomic absorptio n spectrometry. Analvt. Chem., 51(8): 1256-1259.
Organotin compounds rank fourth in industrial production of organometallics, and their uses tend to disperse them directly into natural waters. Different organotin compounds and tin can be separated bv the different boiling points of volatile hydrides which are detected by atomic absorption spectroscopy. The relative concentrations are compared in San Diego Bay, Lake Michigan and Narragansett Bay. Geological Research Division, Scripps Institution of Oceanography, La Jolla, Calif. 92093, U.S.A. (d[h) 79:5920 Hough, R. A. and G..l. Filbin, 1977/78. Factors affecting removal of inorganic ~4C from water. Proc. int. Ass. theor, appl. Limnol. ( Verh. int. Verein. theor. Angew. Limnol.), 20(1): 49-53. The rate of removal of ~C bicarbonate from water was evaluated under several experimental conditions to examine the potential for overestimation of organic ~4C in techniques involving acidification and gas sparging of water samples. Presence of organic buffer, chelator and DOC increased the time necessary for complete removal, suggesting a chemical association of CO2, bicarbonate or carbonate with dissolved organic matter. Although reversible, this association may reflect CO2 equilibrium reaction rates in seawater. Department of Biology, Wayne State University, Detroit, Mich. 48202, U.S.A. (bwt) 79:5921 Maxwell, R. J. and D. P. Schwartz, 1979. A rapid, quantitative procedure for measuring the unsapouifiable matter from animal, marine, and plant oils, J. Am. Oil Chem. Soc., 56(6): 634-636. Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, Philadelphia, Pa. 19118, U.S.A. 79:5922 McDuff, R. E. and R. A. Ellis, 1979. Determining diffusion coefficients in marine sediments: a loboratory study of the validity of resistivity techniques. Am. J. Sci., 279(6): 666-675.
OLR(1979)26(12)
79:5916 Yoshida, Kozo, 1977. Physical oceanography in Japan: some topics on the activities during the last
ten to twenty years [1957-1977]. Rec. Prog. nat. Sci. Japan, 2: 73-82.
B. CHEMICAL OCEANOGRAPHY
1. Apparatus and methods 79:5917 Bikbulatov, E. S. and V, M. Vereshchagin, 1979. A reagent for the determination of nitrites in natural waters. (In Russian.) Okeanologiia. 19(2): 341-343. Tests of different sulfa drugs with respect to their azo coupling with 1-naphthylamine have shown that the maximum yield of azo dye is obtained when dissolved streptocide is used. Based on this reaction, a method of determining nitrites in fresh and sea water has been developed which is simpler than the well-known Benshneider-Robinson method and more sensitive than the Griss-llosvy method. 79:5918 Carsin, J. L. and A. Paltry, 1978. Problemes poses par l'automatisation du dosage potentiom6trique de l'oxygene dissous dans la methode de Winkler. [Problems posed by the automation of the Winkler method for the potentiometric determination of dissolved oxygen.] Annls hydrogr., (5)6(2)(749): 19-25. The determination of dissolved oxygen concentration by end point potentiometry in the Winkler method is a semi-automatic process. It is possible to remove the need of an operator's intervention between two titrations by fitting the automatic burette and titrator together with a sampler and tape-recording computer. Contact of the solution with air oxygen must be avoided during the interval between sampling and titration: any error is revealed by comparing the thiosulfate quantities used. The automation of the Winkler method can only be applied to samples at 3oC. 79:5919 Hodge, V. F., S. L. Seidel and E. D. Goldberg, 1979. Determination of tin (IV) and organotin compounds in natural waters, coastal sediments and macro algae by atomic absorptio n spectrometry. Analvt. Chem., 51(8): 1256-1259.
Organotin compounds rank fourth in industrial production of organometallics, and their uses tend to disperse them directly into natural waters. Different organotin compounds and tin can be separated bv the different boiling points of volatile hydrides which are detected by atomic absorption spectroscopy. The relative concentrations are compared in San Diego Bay, Lake Michigan and Narragansett Bay. Geological Research Division, Scripps Institution of Oceanography, La Jolla, Calif. 92093, U.S.A. (d[h) 79:5920 Hough, R. A. and G..l. Filbin, 1977/78. Factors affecting removal of inorganic ~4C from water. Proc. int. Ass. theor, appl. Limnol. ( Verh. int. Verein. theor. Angew. Limnol.), 20(1): 49-53. The rate of removal of ~C bicarbonate from water was evaluated under several experimental conditions to examine the potential for overestimation of organic ~4C in techniques involving acidification and gas sparging of water samples. Presence of organic buffer, chelator and DOC increased the time necessary for complete removal, suggesting a chemical association of CO2, bicarbonate or carbonate with dissolved organic matter. Although reversible, this association may reflect CO2 equilibrium reaction rates in seawater. Department of Biology, Wayne State University, Detroit, Mich. 48202, U.S.A. (bwt) 79:5921 Maxwell, R. J. and D. P. Schwartz, 1979. A rapid, quantitative procedure for measuring the unsapouifiable matter from animal, marine, and plant oils, J. Am. Oil Chem. Soc., 56(6): 634-636. Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, Philadelphia, Pa. 19118, U.S.A. 79:5922 McDuff, R. E. and R. A. Ellis, 1979. Determining diffusion coefficients in marine sediments: a loboratory study of the validity of resistivity techniques. Am. J. Sci., 279(6): 666-675.