16466
For field capacity conditions , metal mobility increased ( Pb > Cu > Zn > Cd ) for all soils and treatments compared with controls and was significantly correlated ( p < 0 . 05 ) with dissolved organic matter ( r = 0 . 540 ) .
 Pb, Cu, Zn, Cd
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Pb, Cu, Zn, Cd