Galvanized containers

Galvanized containers should therefore not be used for transporting alkalis. Cadmium, which is lower down the group and is more metallic, has a more basic oxide. 

Zinc is the second most important of the essential trace elements for humans. It is a constituent of some enzymes, such as carbonic anhydrase. Zinc is sufficiently abundant that deficiencies of zinc are unknown. The highest levels of zinc are found in shellfish, which may contain 400 ppm. The level of zinc in cereal grains is 30 to 40 ppm. When acid foods such as fruit juices are stored in galvanized containers, sufficient zinc may be dissolved to cause zinc poisoning. The zinc in meat is tightly bound to the myofibrils and has been speculated to influence meat s water-binding capacity (Hamm 1972). 

Zinc is a skin irritant. It is difficult to ingest too much zinc from foodstuffs. Consumption of beverages stored in galvanized containers or pipes, use of zinc utensils, or ingestion of too many zinc supplements can result in nausea, cramps, vomiting, and diarrhea. 

Zn(OH)4 is called the zincate ion. The reactions above suggest that galvanized containers should not be used to transport either acids or alkalis. 

The sheets of alkali cellulose, in the state in which they emerge from the press, are broken up into crumbs in a shredding machine consisting of a drum inside which blades with serrated edges rotate. The crumbs are removed and aged by storing in galvanized containers for 2 or 3 days, the... 

Table 5-5 Some Chemicals That Have Been Successfully Stored in Galvanized Containers... 

Water-free, neutral b Stored in galvanized containers D... 

Zinc—It is not likely that people will receive toxic excesses of zinc from eating ordinary, unsupplemented diets unless some of the foods were stored in zinc-coated (galvanized) containers, because most of the common foods contain only small fractions of the levels of zinc which may be ingested safely. However, zinc toxicity due to contamination of food by galvanized containers or similar means may be accompanied by nausea, vomiting, stomachache, diarrhea, and fever. 

Zinc poisoning may result from eating foods that have been stored in galvanized containers. 

Storage Store 0-95 C in containers closed store in clean steel or plastic containers separate from acids, reactive metals, ammonium salts do not store in aluminum, fiberglass, copper, brass, zinc or galvanized containers A 1847 Sodium Silicate Solution [PQ]... 

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