Copper Colorimeter & Stained Water

[jefra]

The water in my quarantine tank is currently stained yellowish green due to antibiotic use. If I try to measure its copper level with a Hanna colorimeter, would I still get accurate results considering the abnormal hue?

Thanks for your help.

 

[EmdeReef]

It should be fine unless the sample you take is truly turbid or otherwise visibly unclear.

If either is the case then you should either use fine filter paper or do a large water change before measuring copper.

For really bad looking cases you should consider water changes.