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Poisons which Occur in Food.The most frequent source of lead which is taken into the stomach is drinking water. Some springs and wells contain lead in such quantity as to render them unfit for use ; but the lead is not usually obtained from the ground, but from the service pipes. Dr. Chandler, of New York, found one-tenth of a grain of lead in a gallon of Croton water, after it had stood for six hours in a lead pipe. Many drinking vessels also contain lead; even those which are made of Britannia metal or other material that is itself free from lead, contain a good deal of this metal in the solder with which the parts are cemented together. It was found in one experiment that water which had stood twenty-four hours in such a vessel contained lead in the proportion of over eleven grains to the gallon. The occasional use of such water probably causes no injury, but the long-continued employment of it may result in the symptoms of lead-poisoning, even if there be no more than one-tenth of a grain of the metal in a gallon of water. Cans and other vessels used to preserve fruits, lobsters, etc., are frequently soldered in such a way that the lead contained in the solder becomes mixed with the contents of the can ; if these contents contain free acids there may result also chemical combination with the solder, so that the lead is dissolved in the liquid contained in the vessel. Some years ago, an extensive series of cases of lead-poisoning in New Orleans was traced to the drinking of soda water from a particular and popular fountain. It was discovered that the reservoirs were so constructed as to permit the solution of lead combinations in the soda water. A Scotch chemist recently found half a grain of lead in a gallon of soda water. Vinegar often contains lead as an impurity, resulting from the manufacture. All vessels, pipes, spigots, and the like, which contain lead, and are exposed to the action of acid liquids, are liable to furnish a poisonous element in the liquids which pass through them. Many cooking vessels are lined with materials containing lead; this is said to be true of some of the so-called porcelain-lined vessels. Instances are known in which lead-poisoning has followed the use of flour from a certain mill. Investigation showed that the millstones, having been worn so as to become uneven, had been repaired by filling up the cavities with melted lead ; particles of this had been worn away and mixed with the flour. But first, if you want to come back to this web site again, just add it to your bookmarks or favorites now! Then you'll find it easy! Also, please consider sharing our helpful website with your online friends.
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