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121
08/29/2010, 04:31 AM
Does one exist for seawater?

I saw it advertised in the Seawater Test section on the Merck website, but after looking at the online instructions for each Merck zinc test, they're either not suitable or not listed as usable for seawater.

HighlandReefer
08/29/2010, 06:42 AM
Zinc is found in salt mixes at a concentration around 12 parts per billion and levels found in natural pristine reefs are much lower. Hobby grade test kits can't detect zinc at these levels and would only be suitable to let you know your zinc level is extremely high. This is the same problem with hobby grade copper test kits. It would take some very expensive equipment to detect copper down at the levels found in a reef aquarium.

Feature Article: Inland Reef Aquaria Salt Study, Part I
http://www.advancedaquarist.com/2005/11/aafeature1

Feature Article: Inland Reef Aquaria Salt Study Part II
http://www.advancedaquarist.com/2005/12/aafeature1

bertoni
08/29/2010, 03:37 PM
I haven't heard of a test kit for zinc. A lab could run a test for you, but it'd be expensive, probably $50-100. You could check at enclabs.com if you're interested.