No Chemosphere style?
No Chemosphere journal style available in here: http://www.zotero.org/styles?
This is an old discussion that has not been active in a long time. Instead of commenting here, you should start a new discussion. If you think the content of this discussion is still relevant, you can link to it from your new discussion.
http://www.zotero.org/support/dev/citation_styles#editing_csl_10_styles
for some helpful links.
You can also request a style
http://www.zotero.org/support/requesting_styles
but there are no guarantees how quickly someone (usually me) will find the time to code it - can easily take a month or two.