Lead salts, inorganic

Synonyms/Compounds Metallic lead lead oxide lead salts inorganic lead... 

By 1938, one fact was clearly established. Sweet compounds, unlike salty and sour compounds, are found in all classes of chemical compounds, including such inorganic salts as beryllium ( glucinium ) and lead salts. They are also found among compounds of all molecular shapes and sizes, and stereochemical changes may result in a very dramatic change in the taste, as seen in the gustatory differences between enantiomorphs. 

Kehoe RA. 1927. On the toxicity of tetraethyl lead and inorganic lead salts. J Lab Clin Med 7 554-560. 

Dining maintenance work on casings of fans used to extract perchloric acid fumes, seven violent explosions occurred when flanges sealed with lead oxide-glycerol cement were disturbed. The explosions, attributed to formation of explosive compounds by interaction of the cement with perchloric acid, may have involved perchlorate esters and/or lead salts. Use of an alternative inorganic silicate-hexafluorosilicate cement is recommended. 

Me4Pb has also been produced by incubation of inorganic lead salts [Pb(NC>3)2, PbCU, Pb(OAc)2] with biologically active sediments and waters from the Tamar Estuary, UK67. 

Lead sulfide occurs naturally as the mineral galena. It can be prepared in the laboratory as a black precipitate by passing hydrogen sulfide through a dilute acid solution of inorganic lead salt, such as lead nitrate or lead acetate ... 

Inorganic lead compounds such as PbO, Pb02, Pb304, PbS, lead molybdate and lead perchlorate 2) Lead salts of organic adds such as 2,4-dihydroxy benzoic add, salicylic add, acetyl salicylic add and methoxy propionic add i) Effective with propellants of cal. val. less than 900 cal. g 1 ii) Lead salts of aromatic adds are effective with propellants of higher cal. val. [237]. 

The solution is evaporated to dryness under reduced pressure on a water bath. In order to remove as much hydrochloric acid as possible, the temperature of the bath is raised to 100° toward the end of the distillation. The residue of amino acid hydrochloride and inorganic salts is suspended in 500 cc. of absolute ethyl alcohol. The suspension is boiled on a steam bath for a short time, then cooled to room temperature and filtered on a Buchner funnel. The residue of inorganic salts is washed with 500 cc. of absolute ethyl alcohol. To the combined filtrates is added 400 cc. of ethyl ether (u. s. p. quality) in order to precipitate inorganic material. After several hours the mixture is filtered, and the residue is washed with a 5 2 mixture of absolute ethyl alcohol and ether. The filtrate is transferred to a 5-1. round-bottomed flask, about 200 cc. of water is added, and the liquids are removed by distillation under reduced pressure. The nearly dry residue is dissolved in 2 1. of water, and the solution is treated with an excess of freshly prepared lead hydroxide (Note 5). The suspension is diluted with water to a volume of about 3.5 1. and is then concentrated under reduced pressure, at as low a temperature as possible, to a volume of about 2 1. The suspension is then filtered with suction (Note 6), and the residue of lead salts is washed thoroughly with water. The cloudy filtrate, which still contains some free ammonia, is concentrated by distillation under reduced pressure to a volume of about 300-400 cc. The mixture is filtered, the filtrate is saturated with hydrogen sulfide gas, and the precipitate of lead sulfide is removed by filtration with suction (Note 6). The solution is now concentrated by distillation under reduced pressure on a water bath, and 1 1. of 95 per cent ethyl alcohol is added to the nearly dry residue of the amino acid. The suspension is boiled under a reflux condenser until nearly all the amino acid is dissolved, and the mixture is then allowed to cool to room temperature. The amino acid, which separates in the form of fine needles, is collected on a Buchner funnel and washed with a little 95 per cent ethyl alcohol. A second crop of... 

Such catalysts include potassium acetate, sodium benzoate, certain basic inorganic salts (IS, 21, 22), lead oleate and other lead salts (23), alkali soaps (23), and metal naphthenates (2Ji). Also at 125°, trimers of phenyl isocyanate form in high yield catalyzed by A-methylmorpholine in the presence of ethyl alcohol (26). Epoxides have been reported to be active for trimerization in the presence of a small amount of amine (26, 27). Ethylene carbonate also is effective in production of trimer (28). Recently... 

The fourth class which are peculiar to PVC have one thing in common namely an ability to react witti HCl. They include such diverse substances as inorganic lead salts, heavy metal soaps, organo-tin compounds, epoxides and many others. Although their ability to react with HCl may be a contributory factor their main function is undoubtedly to react with and deactivate potential sites of initiation such as branch points or areas of unsaturation.. ... 

MOTOR FUEL ANTI-KNOCK COMPOUND (75-74-1) Forms explosive mixture with air (flash point 100°F/38°C). Decomposes in water to form trimethyl saltdiethyl salt— inorganic lead salt. Violent reaction with oxidizers, sulfuryl chloride, potassium permanganate, tetrachlorotrifluoromethylphosphorane. Decomposes in sunlight and in elevated... 

Lead salts of other inorganic and of organic acids may replace the lead chloride, as also may lead oxide or sulfide, and these may be brought into reaction with organo-lithium, -magnesium, -zinc, or -aluminum compounds methods for obtaining tetraethyllead have been studied in particular detail.465... 

The uptake of inorganic lead salt applied to the skin is limited. In one study, the uptake was less than 0.1% in one month (Moore et al. 1980). 

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