## Question

###### An aquatic plant sample containing copper (II) was analyzed byflame atomic absorption spectrophotometry. 0.2495 g of the samplewere taken and after the digestion process the solution was broughtup to the 50.0 mL mark. This solution had to be diluted 10 timesand then its absorbance was measured as 0.182. The least squaresregression of the calibration data resulted in the followingequation: y = 1.12 x (in ppm Cu) + 0.0412. Calculate the copperconcentration, in ppm, in the plant sample.

An aquatic plant sample containing copper (II) was analyzed by flame atomic absorption spectrophotometry. 0.2495 g of the sample were taken and after the digestion process the solution was brought up to the 50.0 mL mark. This solution had to be diluted 10 times and then its absorbance was measured as 0.182. The least squares regression of the calibration data resulted in the following equation: y = 1.12 x (in ppm Cu) + 0.0412. Calculate the copper concentration, in ppm, in the plant sample.

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