● As a trace element that is widely and naturally present in our environment, Manganese is the 12th most abundant element on the Earth's surface. 
● Manganese is an essential element for the growth of humans, animals and plants, which is fundamental to maintain human health. 
● In July 1990, The Food and Drug Administration of the United States suggests that at least 3,500 micrograms of manganese should be consumed daily. 
● Manganese is abundant in daily foods and also in the air we breathe. For example, a cup of tea contains 1,200 micrograms of manganese. 
● The average person takes in about 99% of manganese from food and water, while less than 1% comes from the air. 
Ordinary gasoline is somewhat toxic. Adding 18mgMn/L to gasoline will not increase the toxicity of gasoline. Higher concentrations of MMT(greater than 20%) are highly toxic. The main manifestations and treatment methods are shown in the table. 

	Contact method	Phenomenon	Treatment method
1	Skin contact	Single contact is non irritating	Wash your skin immediately with soapy water. If it penetrates your clothes, remove them immediately and wash with soapy water..
2	Eye stimulation	Stimulating	Wash your eyes with plenty of water and seek medical attention.
3	Inhalation	Grassy smell. Inhaling a large amount can cause headache and nausea	Move the patient to a place with fresh air and provide oxygen. Seek medical attention immediately if the condition is serious.
4	Ingestion	Nausea and dizziness	Induce vomiting, seek medical attention immediately
5	Leakage	Insoluble in water	Collect or cover with dry soil