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In addition , Ni accumulation kinetics was explored to provide mechanistic insight into current approaches of toxicity modeling , such as the tissue residue approach and the biotic ligand model ( BLM ) , and the implications for plant Ni risk assessment .
 Chemical: Ni; Chemical: Ni
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