Hi Lauren, I would be ...

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Hi Lauren, I would be surprised if the choice of bottle material had any impact on your results. I would personally take the cheapest one. You could always do a quick test with 2 bottles of each type, store them with an arsenic solution and analyse the the solution after a week. Regarding the acid, I would chose either HCl or nitric acid. Again, shouldn't have an impact on the results. Kind regards, Jorgen