Preservatives keep out bacterial contamination and increase the shelf life of vaccines. THere are other preservatives, sodium azide is one that comes to mind. Preservatives are used in miniscule doses usually .1% of the vaccine usually. I can get you some links from home. But really you can go to NIAID's home page and get some good info (NIH-National Institute of Allergy and Infectious Diseases..just google NIAID) ANd mercury is a small part of the preservative thimerosol so over all mercury exposures from vaccines are minimal. NIAID has an excellent discussion on this.
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