Links

1.    The Chemical Institute of Canada (http://www.chemistry.ca)

2.    NRC Institute for National Measurement Standards http://www.nrc-cnrc.gc.ca/eng/services/inms/reference-materials.html

3.    National Institute of Standards and Technology. http://www.nist.gov/index.html

4.    U.S. Environmental Protection Agency http://www.epa.gov/

5.    The Virtual Institute for Speciation Analysis http://www.speciation.net/

6.    Environmentalchemistry.com  http://environmentalchemistry.com/

7.    Chemicalelements.com  http://www.chemicalelements.com