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  1. E. C. Barnes and G. W. Penney, "An electrostatic dust weight sampler," J. Ind. Hyg. and Tox. 20, 259–265 (1938).
  2. W. Gerlach and E. Schweitzer, Foundations and Methods of Chemical Analysis by the Emission Spectrum (A. Hilger, Ltd., London, 1931).
  3. G. O. Langstroth and D. R. McRae, "Transport of materials in sources for spectroscopic analysis," Can. J. Research 16A, 61–74 (1938).
  4. T. M. Hess, J. S. Owens, and L. G. Reinhardt, "Analysis of organic materials for traces of metallic impurities," Ind. and Eng. Chem., Anal. Ed. 11, 646–649 (1939).
  5. B. F. Scribner, "The comparison of line intensities in spectrochemical analysis," Proceedings of the Fifth Summer Conference on Spectroscopy (John Wiley, New York, 1938), pp. 61–74.
  6. L. W. Strock, Spectrum Analysis with the Carbon Arc Cathode Layer (A. Hilger, Ltd., London, 1936).
  7. O. S. Duffendack and K. B. Thompson, "Developments in the quantitative analysis of solutions by spectrographic means," Proc. A. S. T. M. 36, 301–309 (1936), Part 2.
  8. A description of this circuit will be presented in another paper.
  9. O. S. Duffendack and R. A. Wolfe, "Analysis of caustic liquors for traces of impurities," Ind. and Eng. Chem., Anal. Ed. 10, 161–164 (1938).
  10. W. E. Forsythe, The Measurement of Radiant Energy (McGraw-Hill, New York, 1937), p. 285.
  11. The chemical analyses reported in this table and all analyses with the dropping mercury electrode were made by Florence L. Feicht, junior physicist, Health Division, Bureau of Mines.
  12. The samples were supplied by the American Zinc 8 Chemical Co., Langeloth, Pennsylvania. The results of the chemical analyses were obtained in the course of regular control analyses performed under the direction of J. O. Butler, chief chemist of this company. Lead was determined by the molybdate method, zinc by the ferricyanide method, and cadmium by precipitation as the sulfide, solution, reprecipitation by aluminum, and titration with ferricyanide.

1939 (1)

T. M. Hess, J. S. Owens, and L. G. Reinhardt, "Analysis of organic materials for traces of metallic impurities," Ind. and Eng. Chem., Anal. Ed. 11, 646–649 (1939).

1938 (3)

E. C. Barnes and G. W. Penney, "An electrostatic dust weight sampler," J. Ind. Hyg. and Tox. 20, 259–265 (1938).

G. O. Langstroth and D. R. McRae, "Transport of materials in sources for spectroscopic analysis," Can. J. Research 16A, 61–74 (1938).

O. S. Duffendack and R. A. Wolfe, "Analysis of caustic liquors for traces of impurities," Ind. and Eng. Chem., Anal. Ed. 10, 161–164 (1938).

1936 (1)

O. S. Duffendack and K. B. Thompson, "Developments in the quantitative analysis of solutions by spectrographic means," Proc. A. S. T. M. 36, 301–309 (1936), Part 2.

Barnes, E. C.

E. C. Barnes and G. W. Penney, "An electrostatic dust weight sampler," J. Ind. Hyg. and Tox. 20, 259–265 (1938).

Duffendack, O. S.

O. S. Duffendack and R. A. Wolfe, "Analysis of caustic liquors for traces of impurities," Ind. and Eng. Chem., Anal. Ed. 10, 161–164 (1938).

O. S. Duffendack and K. B. Thompson, "Developments in the quantitative analysis of solutions by spectrographic means," Proc. A. S. T. M. 36, 301–309 (1936), Part 2.

Forsythe, W. E.

W. E. Forsythe, The Measurement of Radiant Energy (McGraw-Hill, New York, 1937), p. 285.

Gerlach, W.

W. Gerlach and E. Schweitzer, Foundations and Methods of Chemical Analysis by the Emission Spectrum (A. Hilger, Ltd., London, 1931).

Hess, T. M.

T. M. Hess, J. S. Owens, and L. G. Reinhardt, "Analysis of organic materials for traces of metallic impurities," Ind. and Eng. Chem., Anal. Ed. 11, 646–649 (1939).

Langstroth, G. O.

G. O. Langstroth and D. R. McRae, "Transport of materials in sources for spectroscopic analysis," Can. J. Research 16A, 61–74 (1938).

McRae, D. R.

G. O. Langstroth and D. R. McRae, "Transport of materials in sources for spectroscopic analysis," Can. J. Research 16A, 61–74 (1938).

Owens, J. S.

T. M. Hess, J. S. Owens, and L. G. Reinhardt, "Analysis of organic materials for traces of metallic impurities," Ind. and Eng. Chem., Anal. Ed. 11, 646–649 (1939).

Penney, G. W.

E. C. Barnes and G. W. Penney, "An electrostatic dust weight sampler," J. Ind. Hyg. and Tox. 20, 259–265 (1938).

Reinhardt, L. G.

T. M. Hess, J. S. Owens, and L. G. Reinhardt, "Analysis of organic materials for traces of metallic impurities," Ind. and Eng. Chem., Anal. Ed. 11, 646–649 (1939).

Schweitzer, E.

W. Gerlach and E. Schweitzer, Foundations and Methods of Chemical Analysis by the Emission Spectrum (A. Hilger, Ltd., London, 1931).

Scribner, B. F.

B. F. Scribner, "The comparison of line intensities in spectrochemical analysis," Proceedings of the Fifth Summer Conference on Spectroscopy (John Wiley, New York, 1938), pp. 61–74.

Strock, L. W.

L. W. Strock, Spectrum Analysis with the Carbon Arc Cathode Layer (A. Hilger, Ltd., London, 1936).

Thompson, K. B.

O. S. Duffendack and K. B. Thompson, "Developments in the quantitative analysis of solutions by spectrographic means," Proc. A. S. T. M. 36, 301–309 (1936), Part 2.

Wolfe, R. A.

O. S. Duffendack and R. A. Wolfe, "Analysis of caustic liquors for traces of impurities," Ind. and Eng. Chem., Anal. Ed. 10, 161–164 (1938).

Can. J. Research (1)

G. O. Langstroth and D. R. McRae, "Transport of materials in sources for spectroscopic analysis," Can. J. Research 16A, 61–74 (1938).

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

T. M. Hess, J. S. Owens, and L. G. Reinhardt, "Analysis of organic materials for traces of metallic impurities," Ind. and Eng. Chem., Anal. Ed. 11, 646–649 (1939).

O. S. Duffendack and R. A. Wolfe, "Analysis of caustic liquors for traces of impurities," Ind. and Eng. Chem., Anal. Ed. 10, 161–164 (1938).

J. Ind. Hyg. and Tox. (1)

E. C. Barnes and G. W. Penney, "An electrostatic dust weight sampler," J. Ind. Hyg. and Tox. 20, 259–265 (1938).

Proc. A. S. T. M. (1)

O. S. Duffendack and K. B. Thompson, "Developments in the quantitative analysis of solutions by spectrographic means," Proc. A. S. T. M. 36, 301–309 (1936), Part 2.

Other (7)

A description of this circuit will be presented in another paper.

W. Gerlach and E. Schweitzer, Foundations and Methods of Chemical Analysis by the Emission Spectrum (A. Hilger, Ltd., London, 1931).

B. F. Scribner, "The comparison of line intensities in spectrochemical analysis," Proceedings of the Fifth Summer Conference on Spectroscopy (John Wiley, New York, 1938), pp. 61–74.

L. W. Strock, Spectrum Analysis with the Carbon Arc Cathode Layer (A. Hilger, Ltd., London, 1936).

W. E. Forsythe, The Measurement of Radiant Energy (McGraw-Hill, New York, 1937), p. 285.

The chemical analyses reported in this table and all analyses with the dropping mercury electrode were made by Florence L. Feicht, junior physicist, Health Division, Bureau of Mines.

The samples were supplied by the American Zinc 8 Chemical Co., Langeloth, Pennsylvania. The results of the chemical analyses were obtained in the course of regular control analyses performed under the direction of J. O. Butler, chief chemist of this company. Lead was determined by the molybdate method, zinc by the ferricyanide method, and cadmium by precipitation as the sulfide, solution, reprecipitation by aluminum, and titration with ferricyanide.

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