Interferences in Diphenylcarbazide as Cr+6 indicator

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Respected Sir,

I am doing one Project in IIT, Mumbai.
I am doing project on Chromium removal from pond water/waste water by using micro-organisms, for this i had to find a method of detecting chromium presence in that water, i found that diphenylcarbazide binds to chromium [VI] which i am looking for. I wanted to know that this reagent binds only to Cr[VI] or there are some interfering substances like vanadium etc???

Thank you,

Yours Faithfully

Animesh Deval
Student - Mumbai, Maharashtra, India