A student measured the concentration of a metal in soil samples with FAAS. Reage

Question

A student measured the concentration of a metal in soil samples with FAAS. Reagent blanks give signals of 2.0, 2.0, 1.6, 0.5, 0.7, 1.6, and 0.7 abs units. The slope of the calibration curve is m = 0.325 abs units/ppm.

Calculate the average of blank signals with three significant figures.

1.3

Calculate the standard deviation of blank signals with three significant figures.

0.648

****Calculate the minimum detectable concentration (detection limit in ppm) with two significant figures. (just answer this one)

Explanation / Answer

DL = 3.3X SD/B

DL= 3.3*0.648/0.325

DL= 6.58

DL= DETECTION LIMIT

SD= STD DEVIATION

B= SLOPE OF REGRESSION LINE

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