And - as in the case of middle distance runner Diane Modahl - incorrect storing of a urine sample may alter its chemical components.

BBC: Doping: Banned substances

To avoid the risk of contaminants being mixed into the recycled plastic, the new recycling system performs quality control based on a chemical substances risk management database developed by Fujitsu Laboratories, thereby ensuring that notebook PCs and other ICT devices comply with legal requirements for chemical components.

ENGADGET: Fujitsu making laptops from unwanted CDs and DVDs

Among the largest underlying components of XLB, in trading today Dow Chemical Company ( DOW) is off about 1%, and Praxair Incorporated ( PX) is lower by about 0.8%.

FORBES: Materials Sector Sees Outflows -- DOW, PX Lower

Among the largest underlying components of IYM, in trading today Dow Chemical Company ( DOW) is up about 1.4%, and Praxair Incorporated ( PX) is up by about 1.8%.

FORBES: Weakness In Materials Sector Could Impact These Stocks

At present, the plan is for it to be reprocessed using solvents and chemical processes to separate it into high-level and low-level components.

ECONOMIST: Nuclear waste

The Petroleum Association of Wyoming says that 2-BE isn't an oil and gas chemical but is a common fire retardant used in association with plastics and plastic components used in drinking wells.

WSJ: Review & Outlook: The EPA's Fracking Scare