Metal poisons

Feed Ga.s Purifica.tion. Because nickel-based reforming catalysts are quite sensitive to sulfur, halogen, and heavy metal poisons which may be found ia natural gas, a feedstock purification system is normally required. Sulfur compounds, ia both organic and inorganic forms, are the most common... 

Effects of various combinations of 3c(-transition metals on the formation of SW tubes have been studied by Seraphin and Zhou[41]. They reported that mixed metals enhanced the production of SW tubes in particular, a 50% Fe -I- 50% Ni combination performed much better than Fe, Co, or Ni alone. It was also shown that the addition of some metals, such as Cu, to these metals poisoned their catalytic action. 

Metal poisons Certain metals that cause illness or death when inhaled or ingested. 

Germanium and Sn are non-toxic (like C and Si). Lead is now recognized as a heavy-metal poison it acts by complexing with oxo-groups... 

Therapeutic Function Antidote in heavy metal poisoning Chemical Name N-(2-Mercapto-1-oxopropyl)glycine Common Name Mercamidum... 

The metals in the FCC feed have many deleterious effects. Nickel causes excess hydrogen production, forcing eventual loss in the conversion or thruput. Both vanadium and sodium destroy catalyst structure, causing losses in activity and selectivity. Solving the undesirable effects of metal poisoning involves several approaches ... 

One problem with heterogeneous catalysis is that the solid catalyst is easily poisoned. Foreign materials deposited on the catalytic surface during the reaction reduce or even destroy its effectiveness. A major reason for using unleaded gasoline is that lead metal poisons the Pt-Rh mixture in the catalytic converter. 

Propane-1,2-diol, 3-mercapto-metal complexes, 2,804 Propan-l-ol, 2-amino-2-methyl-copper(II) complexes, 2,795 Propan-l-ol, 2,3-dimercapto-chelating agent heavy metal poisoning, 6,767 Propan-l-ol, 3-(methylamino)-copper(II) complexes, 2,795 Propan-2-ol... 

Ultraviolet spectroscopy metal in water complexes, 2, 309 redox potentials and, 1,498 Ultraviolet-visible spectroscopy, 1, 243 Umbellicomplexone metallofluorescent indicator, 1. 558 Undecametallic complexes, 1, 167 Uni thiol chelating agent heavy metal poisoning, 6. 767 Unsaturated compounds hydrogenation... 

Use antidote (heavy metal poisonings), antirheumatic (PCA and Morbus Wilson)... 

Rahman, Y. E. (1988). Use of liposomes in metal poisonings and metal storage diseases, in Liposomes as Drug Carriers Recent Trends and Progress (G. Gregoriadis, ed.), John Wiley and Sons, Chichester, pp. 485-495. 

The cause of Newtons psychosis has since remained a mystery. Although some authors have attributed Newtons illness to metal poisoning secondary to his experiments in alchemy, Christianson (1) presents excellent evidence against this theory"... 

Deny that Newton s psychosis was caused by his alchemy. "The timing of Newtons "episode," which seems to have been limited to a circumscribed period of 18 months between 1692 and 1693 (at most) also does not fit the metal-poisoning hypothesis, since his experiments in alchemy (and exposure to mercury and other metals) preceded and continued well beyond this period. As Christianson (1984) commented, "Should there not have been additional breakdowns, given his prolonged addiction to the fire and the crucible " (p. 360)"... 

Benfey, Otto Th. Spinach as an alchemical antidote to heavy metal poisoning. Kagakushi J Japanese Soc Hist Chem 15 (1981) 8-12. 

Diphenylamine derivatives are very good antioxidants and provide fatigue activity and good metal poison protection. 

Dihydroquinoline derivatives offer moderate antioxidant and flex cracking activity with excellent metal poison protection. 

Benzimidazole derivatives are excellent antioxidants, with limited fatigue activity. They offer excellent metal poison protection. 

Hydroquinones show very good antioxidant activity, but offer limited fatigue and metal poison protection. 

Dreisbach, R.H. 1983. Metallic Poisons. Arsenic and arsine. Pp. 241-245 in Handbook of Poisoning. Los Altos, CA Lang Medical Publications. 

Biochemical MT (protein) quantitation Bg, Dp, Pc Liver (Bg), digestive gland (Dp, Pc) Metal poisoning... 

The interaction of beryllium with ligands derived from pyrone (272), pyridone (273), and pyrimidinedione (274, 275) have long aroused interest in view of the successful use of these ligands in the treatment of metal poisoning. 

Somasundaram, B., P.E. King, and S.E. Shackley. 1985. The effect of zinc on the ultrastructure of the posterior gut and pronephric ducts of the larva of Clupea harengus L. Comp. Biochem. Physiol. 81C 29-37. Sorensen, E.M.B. 1991. Zinc. Pages 119-174 in Sorensen, E.M.B. (ed.). Metal Poisoning in Fish. CRC Press, Boca Raton, FL. 

EDTA salts are used for the treatment of heavy metal poisoning. Roosels and Vanderkeel142) were able to extract lead from urine in the presence of EDTA with dithizone by adding calcium to presumably release the lead from EDTA. In view of the fact that the formation constant of the lead-EDTA chelate is 20,000,000 times larger than that of the corresponding calcium chelate, it is doubtful that the calcium actually releases the EDTA from the lead. 

The renal tubular dysfunction of galactosemia is very similar to that caused by, e.g., heavy metal poisoning in both cases it seems likely that the inhibition of enzyme systems prevents the cells of the renal tubule... 

Heavy Metal Poisoning The Involvement of Lipoic Acid... 

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