Select Data From #temp Table In SQL

I am building a dynamic query stored procedure. I am first filling a temp table with data:

Declare
@Counter int

drop table #tempmerge
create table #tempmerge(IDIndex int IDENTITY, CitationNum char(9),Exp1 int)

insert into #tempmerge
Select E_Cit_For_Merge, Count(*) as Exp1
from dbo.E_Citation_XML_Data
group by E_Cit_For_Merge
having Count(*)>1
select * from #tempmerge

Results returned from #tempmerge table:

IDIndex CitationNum Exp1
----------- ----------- -----------
1 4AA020621 2
2 4AA022361 2
3 4AA022391 2
4 4AA022423 2
5 4AA022532 3
6 4AA027761 2
7 4AA030513 2

Then, I want to use a while loop, looping thru the #tempmerge table
and retrieving the CitationNum value of each row:

set @RowCount = (Select Count(*) from #tempmerge)
set @Counter = 1
While @Counter <= @RowCount
Begin

Set @WhereStatement2 = ' where E_Cit_For_Merge= (Select CitationNum from #tempmerge
where IDIndex = @Counter)'

E_Cit_For_Merge is a field in a SQL table.
I Declare @Counter as int.

I get the Error message that:

FROM E_Citation_XML_Data where E_Cit_For_Merge= (Select CitationNum from #tempmerge
where IDIndex = @Counter)

Server: Msg 137, Level 15, State 2, Line 24
Must declare the variable '@Counter'.

Any Suggestions?
Thanks
JEB