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Investigating the Partitioning of Inorganic Elements Consumed by Humans between the Various Fractions of Human Wastes - An Alternative Approach
ISSN: 0148-7191, e-ISSN: 2688-3627
Published July 07, 2003 by SAE International in United States
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The elemental composition of food consumed by astronauts is well defined. The major elements carbon, hydrogen, oxygen, nitrogen and sulfur are taken up in large amounts and these are often associated with the organic fraction (carbohydrates, proteins, fats etc) of human tissue. On the other hand, a number of the elements are located in the extracellular fluids and can be accounted for in the liquid and solid waste fraction of humans. These elements fall into three major categories - cationic macroelements (e.g. Ca, K, Na, Mg and Si), anionic macroelements (e.g. P, S and Cl and17 essential microelements, (e.g. Fe, Mn, Cr, Co, Cu, Zn, Se and Sr). When provided in the recommended concentrations to an adult healthy human, these elements should not normally accumulate in humans and will eventually be excreted in the different human wastes. Knowledge of the partitioning of these elements between the different human waste fractions is important in understanding (a) developing waste separation technologies, (b) decision-making on how these elements can be recovered for reuse in space habitats, and (c) to developing the processors for waste management. Though considerable literature exists on these elements, there is a lack of understanding and often conflicting data. Two major reasons for these problems include the lack of controlled experimental protocols and the inherently large variations between human subjects (Parker and Gallagher, 1988) We have used the existing knowledge of human nutrition and waste from the available literature and NASA documentation to build towards a consensus to typify and chemically characterize the various human wastes. It is our belief, that this could be a building block towards integrating a human life support and waste processing in a closed system.
CitationWignarajah, K., Pisharody, S., and Fisher, J., "Investigating the Partitioning of Inorganic Elements Consumed by Humans between the Various Fractions of Human Wastes - An Alternative Approach," SAE Technical Paper 2003-01-2371, 2003, https://doi.org/10.4271/2003-01-2371.
- Agarwal R Afzalpurkar R Fordtran JS 1994 Pathophysiology of potassium absorption and secretion by the human intestine Gastroenterlogy 107 548 571
- Aikawa J 1981 Magnesium: Its Biological Significance CRC Press Boca Raton, Fl
- Bronner F 1997 Calcium. In: Handbook of Nutritionally Essential Mineral Elements O’Dell, BL Sunde RA 13 61 Marcel Dekker New York
- Condran MJ Sadeh WZ Hendricks DW Brzezek ME 1989 A model of human metabolic massflow rates for an engineered closed systems ICED 1989
- Ganong W.F. 1983 Review of Medical Physiology 11 th Edition Lange Medical Publications CA, USA
- Harper, H.A. Rodwell V.W. Mayes P.A. 1979 Review of Physiological Chemistry 17 th Edition Lange Medical Publications CA, USA
- National Research Council 1989 Recommended Dietary Allowances 10 th Edition National Academy Press
- Nicogossian A.E. Huntoon C.L. Pool S.L. 1994 Space Physiology and Medicine Lee & Febiger Publishing Company USA
- Oser BL 1965 Hawk’s Physiological Chemistry MCGraw Hill Book Company 14 th Edition
- Parker D Gallagher S.K. 1988 Distribution of human waste samples in relation to sizing waste processing in space 563 568 In The Second Conference on Lunar Bases and Space Activities of the 21st Century Mendell W.W. Johnson Space Center Houston, TX
- Petersdorf RG Adams RD Braunwald E Isselbacher KJ Martin JB Wilson JD 1983 Harrison’s Principles of Internal Medicine 10th Edition McGraw Hill Book Company
- Rambaut PC Leach CS Johnson PC 1975 calcium and phosphorus changes of the Apollo-17 crewmembers. Nutr. Metabol 18 62 69
- Schroeder H.A. 1973 The Trace Elements and Nutrition - some positive and negative aspects Faber and Faber Publishing Company UK
- USDA 1975 Composition of Foods - raw, processed and prepared Agriculture Handbook no 8, USDA Publication USA