Phthalates are widely used as plasticizers to soften plastics. Among various regulations
for phthalates, the US EPA restricts Bis(2-ethylhexyl) phthalate (<6.0 ug/L) and
DEHA (diethylhexyl adipate) (<400 ug/L), and WHO limits the use of DEHP and DEHA
under 80 ug/L for drinking water. | 
