The chromium in a series of steel samples was determined by ICP emission spectro

Question

The chromium in a series of steel samples was determined by ICP emission spectroscopy. The spectrometer was calibrated with a series of standards containing 0, 2.0, 4.0, 6.0, 8.0 g K2Cr2O7 per milliliter. The instrument reading for these solutions were 3.1, 21.5, 40.9, 57.1, and 77.3 in arbitrary units. 1.2 -g sample of cement dissolved in HCl and diluted to 200 mL after neutralization. The emission readings for a blank and a sample were 4.9 and 28.3, respectively. Calculate the ppm of Cr2O3 in the sample.

I just need to know if I should subtract the blank's readin from the reading of the sample

Explanation / Answer

You should subtract the blank's reading from the reading of the sample.

Also you should subtract the blank's reading from the readings of the series of standards.

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