Select Query remove space automatically

Hi,
I'm a new member of the forum

This is my first experience with Codeigniter and my absolute first with a framework php. Today i'm writing a function in my model to get information from a mysql table. 

I do:

$this->db->select('Web Developer');
....

But i get the error: "SELECT 'Web' 'Developer' FROM ... Column Web doesn't exist "

CI has automatically replaced space with apex, splitting my single column in two columns.

Why does it happen? How could i prevent it?

Thank you in advance!