If you are leaving comments on these blogs with your web address, I would think that the answer would be " Possible but not in the way that you think"
Most bloggers have code in their html that tell the Google spiders to " not follow" the links in their comments section. They do this in a attempt to keep spammers from stuffing their comment section with links when they are not actually bringing value to the discussion. So, you will not get boost in the SERPs due to link juice.
But do not lose hope. If you are an active part in the blogging community and you give good advice and bring relevant comments. People will in inadvertently check you out and your website. Sometimes they will even approach you to solve a solution. I was told some good advice here one time " Never join an online community for the link juice. Join it because you enjoy it and you want to be apart of the community."
If you are guest blogging, this may be a different case...
Hope this was helpful,
C