Correct settings for a perkin elmer

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Is a calibration curve generated by perkin elmer UV-vis Lamda 40 for sulphate analysis in river waters fit for use even when the straight line does not pass through zero but through, say, -0.009?

And what are the correct settings for a perkin elmer UV-vis Lamda 40 for a calibration curve to pass through zero?

Reference no: EM13910083

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