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  1. T. A. Wright, “Report of subcommittee V on standards and pure materials,” Proc. A.S.T.M. 37, 531–7 (1937).
  2. T. A. Wright, “Superpurity metals,” Proc. A.S.T.M. 37, 538–42 (1937).
  3. T. A. Wright, “The Availability of high purity metals for spectroscopic purposes,” Spectroscopy in Science and Industry (John Wiley & Sons, Inc., New York, 1938), pp. 47–50.
  4. E. H. Archibald, The Preparation of Pure Inorganic Substances (John Wiley & Sons, Inc., New York, 1932).
  5. C. C. Nitchie, “Quantitative analysis with the spectrograph,” Ind. Eng. Chem. Anal. Ed. 1, 1–7 (1929).
    [CrossRef]
  6. L. H. Rogers, “Spectrochemical analysis in agricultural research,” J. Opt. Soc. Am. 31, 260–3 (1941).
    [CrossRef]
  7. Photographic Plates for use in Spectroscopy and Astronomy (Eastman Kodak Company, Rochester, New York, 1940), fourth edition.
  8. D. A. Webb, “Latent impurities in electrodes used for spectrographic research,” Nature 139, 248 (1937).
    [CrossRef]
  9. G. W. Standen and L. Kovach, “Purification of graphite electrodes for spectrochemical analysis,” Proc. A.S.T.M. 35, Pt. 2, 79–86 (1935).
  10. J. W. Ryde and H. G. Jenkins, Sensitive Arc Lines of 50 Elements (Adam Hilger, Ltd., London, 1935).
  11. F. E. Holmes, “Apparatus for maintaining constant levels in a water bath and a distilling flask,” Ind. Eng. Chem. Anal. Ed. 12, 483–85 (1940).
    [CrossRef]
  12. P. F. Weatherill and P. S. Brundage, “A revision of the atomic weight of silicon. The ratio SiC4 : SiO2,” J. Am. Chem. Soc. 54, 3932–8 (1932).
    [CrossRef]
  13. W. Noll, “Geochemistry of strontium,” Chem. Erde 8, 507–600 (1934).
  14. V. M. Goldschmidt, “The principles of distribution of chemical elements in minerals and rocks,” J. Chem. Soc.1937, pp. 655–673.
  15. T. W. Richards and Otto Hönigschmid, “A revision of the atomic weight of calcium,” J. Am. Chem. Soc. 32, 1577–90 (1910).
    [CrossRef]
  16. R. A. Steinberg, “Nutrient solution purification for removal of heavy metals in deficiency investigations with Aspergillus niger,” J. Agr. Research 51, 413–24 (1935).
  17. Siemens and A.-G. Halske, (Hellmut Fischer, inventor) Ger.628,078, March28, 1936 (CI. 12g. 1.01) Refining Chemical Elements and Compounds.
  18. W. O. Winkler, “Determination of small quantities of mercury in leafy vegetables by means of diphenylthiocarbazone,” J. Assn. Official Agr. Chem. 18, 638–44 (1938).
  19. T. W. Richards and H. G. Parker, “A revision of the atomic weight of magnesium,” Proc. Am. Acad. 32, 55–73 (1896).
    [CrossRef]
  20. International Committee on New Analytical Reactions and Reagents, Tables of Reagents for Inorganic Analysis (Akademische Verlagsgesellschaft m. b. h., Leipzig, 1938).

1941 (1)

1940 (1)

F. E. Holmes, “Apparatus for maintaining constant levels in a water bath and a distilling flask,” Ind. Eng. Chem. Anal. Ed. 12, 483–85 (1940).
[CrossRef]

1938 (1)

W. O. Winkler, “Determination of small quantities of mercury in leafy vegetables by means of diphenylthiocarbazone,” J. Assn. Official Agr. Chem. 18, 638–44 (1938).

1937 (3)

D. A. Webb, “Latent impurities in electrodes used for spectrographic research,” Nature 139, 248 (1937).
[CrossRef]

T. A. Wright, “Report of subcommittee V on standards and pure materials,” Proc. A.S.T.M. 37, 531–7 (1937).

T. A. Wright, “Superpurity metals,” Proc. A.S.T.M. 37, 538–42 (1937).

1935 (2)

G. W. Standen and L. Kovach, “Purification of graphite electrodes for spectrochemical analysis,” Proc. A.S.T.M. 35, Pt. 2, 79–86 (1935).

R. A. Steinberg, “Nutrient solution purification for removal of heavy metals in deficiency investigations with Aspergillus niger,” J. Agr. Research 51, 413–24 (1935).

1934 (1)

W. Noll, “Geochemistry of strontium,” Chem. Erde 8, 507–600 (1934).

1932 (1)

P. F. Weatherill and P. S. Brundage, “A revision of the atomic weight of silicon. The ratio SiC4 : SiO2,” J. Am. Chem. Soc. 54, 3932–8 (1932).
[CrossRef]

1929 (1)

C. C. Nitchie, “Quantitative analysis with the spectrograph,” Ind. Eng. Chem. Anal. Ed. 1, 1–7 (1929).
[CrossRef]

1910 (1)

T. W. Richards and Otto Hönigschmid, “A revision of the atomic weight of calcium,” J. Am. Chem. Soc. 32, 1577–90 (1910).
[CrossRef]

1896 (1)

T. W. Richards and H. G. Parker, “A revision of the atomic weight of magnesium,” Proc. Am. Acad. 32, 55–73 (1896).
[CrossRef]

Archibald, E. H.

E. H. Archibald, The Preparation of Pure Inorganic Substances (John Wiley & Sons, Inc., New York, 1932).

Brundage, P. S.

P. F. Weatherill and P. S. Brundage, “A revision of the atomic weight of silicon. The ratio SiC4 : SiO2,” J. Am. Chem. Soc. 54, 3932–8 (1932).
[CrossRef]

Fischer, Hellmut

Siemens and A.-G. Halske, (Hellmut Fischer, inventor) Ger.628,078, March28, 1936 (CI. 12g. 1.01) Refining Chemical Elements and Compounds.

Goldschmidt, V. M.

V. M. Goldschmidt, “The principles of distribution of chemical elements in minerals and rocks,” J. Chem. Soc.1937, pp. 655–673.

Halske, A.-G.

Siemens and A.-G. Halske, (Hellmut Fischer, inventor) Ger.628,078, March28, 1936 (CI. 12g. 1.01) Refining Chemical Elements and Compounds.

Holmes, F. E.

F. E. Holmes, “Apparatus for maintaining constant levels in a water bath and a distilling flask,” Ind. Eng. Chem. Anal. Ed. 12, 483–85 (1940).
[CrossRef]

Hönigschmid, Otto

T. W. Richards and Otto Hönigschmid, “A revision of the atomic weight of calcium,” J. Am. Chem. Soc. 32, 1577–90 (1910).
[CrossRef]

Jenkins, H. G.

J. W. Ryde and H. G. Jenkins, Sensitive Arc Lines of 50 Elements (Adam Hilger, Ltd., London, 1935).

Kovach, L.

G. W. Standen and L. Kovach, “Purification of graphite electrodes for spectrochemical analysis,” Proc. A.S.T.M. 35, Pt. 2, 79–86 (1935).

Nitchie, C. C.

C. C. Nitchie, “Quantitative analysis with the spectrograph,” Ind. Eng. Chem. Anal. Ed. 1, 1–7 (1929).
[CrossRef]

Noll, W.

W. Noll, “Geochemistry of strontium,” Chem. Erde 8, 507–600 (1934).

Parker, H. G.

T. W. Richards and H. G. Parker, “A revision of the atomic weight of magnesium,” Proc. Am. Acad. 32, 55–73 (1896).
[CrossRef]

Richards, T. W.

T. W. Richards and Otto Hönigschmid, “A revision of the atomic weight of calcium,” J. Am. Chem. Soc. 32, 1577–90 (1910).
[CrossRef]

T. W. Richards and H. G. Parker, “A revision of the atomic weight of magnesium,” Proc. Am. Acad. 32, 55–73 (1896).
[CrossRef]

Rogers, L. H.

Ryde, J. W.

J. W. Ryde and H. G. Jenkins, Sensitive Arc Lines of 50 Elements (Adam Hilger, Ltd., London, 1935).

Siemens,

Siemens and A.-G. Halske, (Hellmut Fischer, inventor) Ger.628,078, March28, 1936 (CI. 12g. 1.01) Refining Chemical Elements and Compounds.

Standen, G. W.

G. W. Standen and L. Kovach, “Purification of graphite electrodes for spectrochemical analysis,” Proc. A.S.T.M. 35, Pt. 2, 79–86 (1935).

Steinberg, R. A.

R. A. Steinberg, “Nutrient solution purification for removal of heavy metals in deficiency investigations with Aspergillus niger,” J. Agr. Research 51, 413–24 (1935).

Weatherill, P. F.

P. F. Weatherill and P. S. Brundage, “A revision of the atomic weight of silicon. The ratio SiC4 : SiO2,” J. Am. Chem. Soc. 54, 3932–8 (1932).
[CrossRef]

Webb, D. A.

D. A. Webb, “Latent impurities in electrodes used for spectrographic research,” Nature 139, 248 (1937).
[CrossRef]

Winkler, W. O.

W. O. Winkler, “Determination of small quantities of mercury in leafy vegetables by means of diphenylthiocarbazone,” J. Assn. Official Agr. Chem. 18, 638–44 (1938).

Wright, T. A.

T. A. Wright, “Report of subcommittee V on standards and pure materials,” Proc. A.S.T.M. 37, 531–7 (1937).

T. A. Wright, “Superpurity metals,” Proc. A.S.T.M. 37, 538–42 (1937).

T. A. Wright, “The Availability of high purity metals for spectroscopic purposes,” Spectroscopy in Science and Industry (John Wiley & Sons, Inc., New York, 1938), pp. 47–50.

Chem. Erde (1)

W. Noll, “Geochemistry of strontium,” Chem. Erde 8, 507–600 (1934).

Ind. Eng. Chem. Anal. Ed. (2)

F. E. Holmes, “Apparatus for maintaining constant levels in a water bath and a distilling flask,” Ind. Eng. Chem. Anal. Ed. 12, 483–85 (1940).
[CrossRef]

C. C. Nitchie, “Quantitative analysis with the spectrograph,” Ind. Eng. Chem. Anal. Ed. 1, 1–7 (1929).
[CrossRef]

J. Agr. Research (1)

R. A. Steinberg, “Nutrient solution purification for removal of heavy metals in deficiency investigations with Aspergillus niger,” J. Agr. Research 51, 413–24 (1935).

J. Am. Chem. Soc. (2)

P. F. Weatherill and P. S. Brundage, “A revision of the atomic weight of silicon. The ratio SiC4 : SiO2,” J. Am. Chem. Soc. 54, 3932–8 (1932).
[CrossRef]

T. W. Richards and Otto Hönigschmid, “A revision of the atomic weight of calcium,” J. Am. Chem. Soc. 32, 1577–90 (1910).
[CrossRef]

J. Assn. Official Agr. Chem. (1)

W. O. Winkler, “Determination of small quantities of mercury in leafy vegetables by means of diphenylthiocarbazone,” J. Assn. Official Agr. Chem. 18, 638–44 (1938).

J. Opt. Soc. Am. (1)

Nature (1)

D. A. Webb, “Latent impurities in electrodes used for spectrographic research,” Nature 139, 248 (1937).
[CrossRef]

Proc. A.S.T.M. (3)

G. W. Standen and L. Kovach, “Purification of graphite electrodes for spectrochemical analysis,” Proc. A.S.T.M. 35, Pt. 2, 79–86 (1935).

T. A. Wright, “Report of subcommittee V on standards and pure materials,” Proc. A.S.T.M. 37, 531–7 (1937).

T. A. Wright, “Superpurity metals,” Proc. A.S.T.M. 37, 538–42 (1937).

Proc. Am. Acad. (1)

T. W. Richards and H. G. Parker, “A revision of the atomic weight of magnesium,” Proc. Am. Acad. 32, 55–73 (1896).
[CrossRef]

Other (7)

International Committee on New Analytical Reactions and Reagents, Tables of Reagents for Inorganic Analysis (Akademische Verlagsgesellschaft m. b. h., Leipzig, 1938).

Siemens and A.-G. Halske, (Hellmut Fischer, inventor) Ger.628,078, March28, 1936 (CI. 12g. 1.01) Refining Chemical Elements and Compounds.

T. A. Wright, “The Availability of high purity metals for spectroscopic purposes,” Spectroscopy in Science and Industry (John Wiley & Sons, Inc., New York, 1938), pp. 47–50.

E. H. Archibald, The Preparation of Pure Inorganic Substances (John Wiley & Sons, Inc., New York, 1932).

J. W. Ryde and H. G. Jenkins, Sensitive Arc Lines of 50 Elements (Adam Hilger, Ltd., London, 1935).

Photographic Plates for use in Spectroscopy and Astronomy (Eastman Kodak Company, Rochester, New York, 1940), fourth edition.

V. M. Goldschmidt, “The principles of distribution of chemical elements in minerals and rocks,” J. Chem. Soc.1937, pp. 655–673.

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Figures (7)

Fig. 1
Fig. 1

Barium and strontium as electrode “latent impurities.”

Fig. 2
Fig. 2

Preparation of purified silica by distillation of silicon tetrachloride.

Fig. 3
Fig. 3

Removal of strontium from calcium sulfate by recrystallization.

Fig. 4
Fig. 4

Removal of strontium and barium from magnesium sulfate by recrystallization from sulfuric acid solution.

Fig. 5
Fig. 5

Removal of strontium from potassium nitrate solution by coprecipitation with calcium oxalate.

Fig. 6
Fig. 6

Removal of heavy metals from potassium nitrate solution by basic magnesium carbonate treatment.

Fig. 7
Fig. 7

Removal of heavy metals from potassium nitrate solution by basic magnesium carbonate treatment.

Tables (4)

Tables Icon

Table I Elements included in the study, and wave-lengths employed for analyses.

Tables Icon

Table II Preparation of purified silica by distillation of silicon tetrachloride.

Tables Icon

Table III Removal of various elements from potassium chloride by distillation.

Tables Icon

Table IV Removal of heavy metals from potassium nitrate solution by basic magnesium carbonate treatment.