References
- 1. Ayers, C. W.: The determination of nitrogen and ammonia in tobacco and cigarette smoke; Proc. Soc.Analyt. Chem. 8 (1.971.) 1.7-1.9.
- 2. Frankenburg, W. G., Gottscho, A. M., Kissinger, S., Bender, D., and Ehrlich, M.: Analytical studies on harvested tobacco leaves; Anal. Chem. 25 (1.953) 1.784-1.798.
- 3. Gehrke, C. W., Kaiser, F. E., and Ussary, J. P.: Automated spectrophotometric method for nitrogen in fertilizers; J. Ass, Offic. Anal. Chem. 51 {:t968) 2.D0-21:l.
- 4. Keay, J., and Menage, P. M. A.: Automated distillation procedure for the determination of nitrogen; Analyst 94 (:1969) 895-899. 10.1039/an9699400895
- 5. Pucher, G. W., Vickery, H. B., and Leavenworth, C. 5.: Determination of ammonia and of amide nitrogen in plant tissue; Ind. Eng. Chem., Anal. Ed., 7 {:t935) :lj2.-:lj6. '7'
- 6. Williams, J. F., and Hunt, G. F.: Ammonia in mainstream and side-stream cigarette smoke; 21st Tobacco Chemists' Researdt Conference, Durham, N. C., Oct. :lfJ-20, :1967.