HgCl2 or NaN3?

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daxiongmao's picture
HgCl2 or NaN3?

I need a poison to perserve organic acids from decomposition by bacteria in water samples.
I find that  NaN3 (sodium azide) or HgCl2 can be used through seeking from research papers.
But i  find that NaN3  solid matter can explode when it is shocked , hitted or heated.  And HgC l2
is easy to volatilize to poisonous gas. They are too dangerous to be taken by a plane.
How can i take one of them to collcet water samples thousand kilometers away from my lab?
or can you introduce a better poison to me?