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The calibration equation obtained by spectroscopic method for chromium (Cr) determination is: Signal = (1.32 x ppmCr) + 0.04. An unknown sample was analyzed

The calibration equation obtained by spectroscopic method for chromium (Cr) determination is: Signal = (1.32 x ppmCr) + 0.04. An unknown sample was analyzed three times using this method and the average signal of the unknown was 26.71(+0.08). S/N ratio for the unknown sample is: 177 217 129 334

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