estic ides . ▁ ▁App lications ▁Environment al ▁chem istry ▁is ▁used ▁by ▁the ▁Environment ▁Agency ▁in ▁England , ▁Natural ▁Resources ▁Wales , ▁the ▁United ▁States ▁Environment al ▁Prote ction ▁Agency , ▁the ▁Association ▁of ▁Public ▁Anal yst s , ▁and ▁other ▁environmental ▁ag encies ▁and ▁research ▁bodies ▁around ▁the ▁world ▁to ▁detect ▁and ▁identify ▁the ▁nature ▁and ▁source ▁of ▁poll ut ants . ▁These ▁can ▁include : ▁He avy ▁metal ▁cont am ination ▁of ▁land ▁by ▁industry . ▁These ▁can ▁then ▁be ▁transport ed ▁into ▁water ▁bodies ▁and ▁be ▁taken ▁up ▁by ▁living ▁organ isms . ▁PA H s ▁( Pol y cyc lic ▁A rom atic ▁H ydro car bon ) ▁in ▁large ▁bodies ▁of ▁water ▁cont amin ated ▁by ▁oil ▁sp ills ▁or ▁le aks . ▁Many ▁of ▁the ▁PA H s ▁are ▁car cin og ens ▁and ▁are ▁extremely ▁to xic . ▁They ▁are ▁reg ulated ▁by ▁concentration ▁( pp b ) ▁using ▁environmental ▁chem istry ▁and ▁chrom at ography ▁labor atory ▁testing . ▁N ut ri ents ▁le aching ▁from ▁agricult ural ▁land ▁into ▁water ▁courses , ▁which ▁can ▁lead ▁to ▁alg al ▁blo oms ▁and ▁e ut roph ic ation . ▁Urban ▁run off ▁of ▁poll ut ants ▁was hing ▁off ▁imper vious ▁surfaces ▁( ro ads , ▁par king ▁lots , ▁and ▁ro o ft ops ) ▁during ▁rain ▁storm s . ▁Typ ical ▁poll ut ants ▁include ▁gas oline , ▁motor ▁oil ▁and ▁other ▁hydro car bon ▁comp ounds , ▁met als , ▁nut ri