Subject: Would heavy metal compounds alter development of green plant pigments

I am currently embarking on a school investigation into the affect of 
heavy metal compounds on plant development, specifically lead compounds 
with mung bean seeds. I am currently only looking at changes in dry mass 
compared to a control, but could also examine the affect on pigments (eg 
chlorophil) by paper chromatography. I would like to know if there is 
likely to be any affect with any heavy metals that would cause visible 
effects. 

Thanks for your help and time.

Re: Would heavy metal compounds alter development of green plant pigments