11.   The chemical is deleterious to the environment.

12.   All other chemicals were of analytical grade.

13.   All chemicals were of analytical reagent grade.

14.   All chemicals were of reagent grade.

15.   He reports that the chemical is concentrated in the topmost layers of seawater -- home to the plankton which feed larger marine animals.

16.   There is some evidence that the chemical is carcinogenic in animals.

17.   Police are warning that the chemicals are highly toxic and anyone who comes into contact with them should seek urgent medical attention.

18.   Also in the leaves are other chemicals with yellow and orange colors.

19.   Although all these chemicals are dioxin-related, the method inflates the risk and may not be accurate.

20.   Although the chemicals are still strong favorites among German and U.S. investors, they are likely to cede their position at the vanguard of rising shares.