ABSTRACT
W a ste w a te r sa m p le s co n s is tin g o f F W an d P W are c o lle c te d fro m a
co m m e rc ia l p h o to shop . F e rro u s su lfa te an d h y d ro g e n p e ro x id e (3 5 % ) are
m a n u fa c tu re d by M erck C o m p an y . R e ag e n ts fo r C O D a n a ly se s a re p u rc h a se d
fro m H A C H . T h e res t o f th e u sed ag e n ts are a t la st re a g e n t g rad e .
