Zinc is naturally present in water. The average zinc concentration in seawater is 0.6-5 ppb. Rivers generally contain between 5 and 10 ppb zinc. Algae contain 20-700 ppm, sea fish and shells contain 3-25 ppm, oysters contain 100-900 ppm and lobsters contain 7-50 ppm.
Cyanides (more exactly as cyanogenic glycozides) exist in cassavaroots, and fruit seeds as apricots, prunes, peaches, almonds etc. Cyanide is historically found in the seeds â¦of some fruits. Applesseeds contain cyanide, but a person would have to eat a lot ofapple seeds for the cyanide to have any negative effects. Cyanide is natural found in certain foods. This includes cassava,almonds, pits of some types of fruit, and Lima beans.
A number of cyanide-containing compounds, known as cyanogens, may release cyanide during metabolism. Much of the cyanide used is in the form of salts, such as sodium, potassium, or calcium cyanide, but in the military cyanides are used in the volatile liquid hydrocyanic acid. Cyanide is also known by the military designations AN (for hydrogen cyanide) and CK (for cyanogens chloride).