Use union/intersection query_posts variables in uri request parameter form?

Usually when I create some form of query, I use an array for my arguments like this:

$postslistArgs = array( 
    'child_of' => 320,
    'parent' => 320
);                          
$postslist = get_pages($postslistArgs);

There are other times, however, when I need/want to use URI-style query parameters like this:

get_pages('child_of=320&parent=320');

That’s all straightforward, but is there any way possible to use the URI parameter style on more advance union/intersection queries such as post__not_in that require an array of IDs?