7526
Carbon nanotubes ( CNTs ) can exist in the form of colloidal suspension in aquatic environments , particularly in the presence of natural organic matter or surfactants , and may significantly affect the fate and transport of organic contaminants .
 Chemical: Carbon
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: Carbon