Attention:

Certain features of Sigma-Aldrich.com will be down for maintenance the evening of Friday August 18th starting at 8:00 pm CDT until Saturday August 19th at 12:01 pm CDT.   Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

Sample Collection and Preservation

Individual water and solid methods may mandate the use of a specific container and a particular preservative to ensure sample integrity from collection through sample preparation. Air methods may specify the collection device and media to be used. Following method guidelines is essential for collecting valid samples.