Is there a stopper/plug available for the TKN6011 Digestion tube for storage after digestion?

We do not offer any plug or cap for this tube. If you intend to store the digested samples prior to analysis you would need to transfer the liquid to another container with a lid, such as UC475-NL.

Would this unit work with round bottom tubes as well, or do the individual positions in the hot block have flat bottoms to fit the flat bottom tubes?

The Environmental Express TKN Block is designed for the flat-bottom tubes.

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