utf-8 encoding problem for text field

hi all,
I have a problem concerned with utf-8 encoding and text_field.

the text field - <%= text_field :query, :text %>
In the text_field I entered keloidales de acné

In controller I tried params[:query][:text]
for this I get keloidales de acn and é is omitted..

please can anyone give a solution for this

thanks and regards
Raju