还有化肥含有氯化钠？
Salt in circulation
To a chemist, salt is what you get when positive and negative ions enter each other's orbit. To most everyone else, salt is sodium chloride, the white crystals left over when seawater evaporates. It's the sodium in salt that causes most of the problems. One teaspoon of sodium chloride "" table salt "" contains 2,300 milligrams (mg) of sodium.
The human body can't live without some sodium. It's needed to transmit nerve impulses, contract and relax muscle fibers (including those in the heart and blood vessels), and maintain a proper fluid balance. It doesn't take much to do this. The Yanomamo people of the Amazon rainforest get by on just 200 mg of sodium a day (about the amount found in one-tenth teaspoon of salt). By comparison, the average American gets 3,400 mg (about 1½ teaspoons of salt), while in northern Japan the daily intake is a whopping 26,000 mg (more than 11 teaspoons of salt).
