1, with different properties: salt is sea salt, well salt, mineral salt, lake salt and earth salt from different sources. Sea salt is a kind of salt made from sea water (partly underground brine in the north).

2. Different elements: the salt contains barium salt, chloride, magnesium, lead, arsenic, zinc, sulfate and other impurities. Sea salt has low sodium chloride content, contains various trace elements needed by human body, and does not add any anti-caking agent.

3. Different distribution areas: Salt is distributed in Yuncheng and Linfen, Shanxi. Because the Yellow River flows through the southwest of Shanxi Province, and Shanxi is east of the Yellow River. Haiyan District includes Hainan, Guangdong, Guangxi, Fujian, Zhejiang, Taiwan Province and other places, with Fujian and Zhejiang as the main producing areas.

Extended data:

Precautions:

1. Don't store: When buying salt, don't buy too much at once and store it at home, because iodine will volatilize and decompose under certain conditions.

2, avoid high temperature: please be careful not to put salt when cooking, because the edible rate of salt will become lower under the action of high temperature.

3. Avoid salt storage: If salt is exposed to air for a long time, iodine will easily volatilize and decompose.

4, avoid adding vinegar: because vinegar is acidic, and then iodine will destroy nutrients when it encounters acidity.

5. Salt and radiation: Some people think that eating more salt can prevent radiation, but this has no scientific basis.

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