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accurate detection of low levels of copper in stator water

accurate detection of low levels of copper in stator water

accurate detection of low levels of copper in stator water

(OP)
I am using a Dionex DX-600 for low level transition metal analysis and am having problems obtaining consistent results in the low ppb range.  I have tried acidifying and non-acidifying my samples and have actually obtained higher results for the non-acidified samples which goes against what I expected.  Does anyone know why this may be?

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