most cations and anions do not interfere , but tl ( i ) , cs ( i ) , so ( 2- ) ( 3 ) , s ( 2 ) o ( 2- ) ( 3 ) , edta , and oxidizing ions such as no ( - ) ( 2 ) , io ( - ) ( 3 ) , io ( - ) ( 4 ) , bro ( - ) ( 3 ) , and mno ( - ) ( 4 ) do .
C0003075
anions
C0022023
ions