18368
Alternatively , 250 mg / L Na ( + ) , as NaCl , was protective against Ni toxicity ; and the extent of protection was similar to that demonstrated from salt water with the same Cl ( - ) concentration .
 Chemical: Na ( + ); Chemical: NaCl; Chemical: Ni; Chemical: Cl ( - )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Na ( + ); Chemical: NaCl; Chemical: Ni; Chemical: Cl ( - )