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What is the difference between blue glass and amber glass, and what does that have to do with pH measurement?

April 26, 2017amber BLUE glass measurement pH

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What is the difference between blue glass and amber glass, and what does that have to do with pH measurement?

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The valance of Na+ is much larger than H+. Amber glass has a smaller pore size thus possibly discriminating between H+ and Na+ allowing only the smaller H+ to enter the greatly eliminating Na+ interference.