Hi, I measured bicarbonate ...

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Hi, I measured bicarbonate content by HCl titration in the field (for AMD) and then the same after 5-7 hours, in the lab. Can you imagine that the difference was huge. Bicarbonate content measured in the field was twice bigger than in the lab. I repeated measurement after few days in the lab and the difference wasn't significantl.... So I think if we have contaminated water we should measure bicarbonate content in the field.