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Overall , although an effect of major cations on Ni toxicity to L . minor L . was observed at a physiological level , Ni ( 2 + ) or NiTot alone modeled plant response , generally within a span of twofold , over a wide range of water chemistry .
 Chemical: Ni; Chemical: Ni ( 2 + )
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: Ni; Chemical: Ni ( 2 + )