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.
The main symptoms of acute poisoning by cyanides are due to the interference of cyanide in the assimilation and distribution of oxygen in the body. Whether the cyanide source is HCN or ingestion of food containing a water soluble cyanide such as potassium or sodium salt, the poisoning mechanism is the same.The cyanide ions react irreversibly with the iron, in particular with the iron in the cytochrome c oxidase and hemoglobin.hether the cyanide source is HCN or ingestion of food containing a water soluble cyanide such as potassium or sodium salt, the poisoning mechanism is the same. The cyanide ions react irreversibly with the iron, in particular with the iron in the cytochrome c oxidase and hemoglobin.