| http://www.w3.org/ns/prov#value | - The element can be effectively added by a method comprising the step of adding the salt, the halide or an organic metal compound of one or more types of elements selected from a group consisting of lithium, magnesium, sodium, potassium, aluminum, zinc, calcium, barium, lead, indium, boron, silicon, tin, phosphorus, arsenic, antimony, bismuth, chlorine and fluorine.
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