145. Solving a chemistry problem

145. Solving a chemistry problem

61. Option 1
A sample of animal tissue weighing m g was burnt in a muffle furnace, the residue was dissolved in HCl and diluted with a solution of lanthanum salt to 5.00 ml to eliminate the interfering influence of phosphate ions.
Equal volumes of standard calcium solutions containing С0 = 0 were added to four equal portions of the analyzed solution; C1 = 2.0; C2 = 4.0; C3 = 8.0 µg / ml Ca and the same amount of lanthanum salt as in the analyzed solution. The atomic absorption spectrophotometer measured the optical density of the analytical line of calcium (422.67 nm)
Calculate the concentration of calcium (mg / kg) in the following samples, using the construction of the calibration curve using the method of additives:
Option 1
m = 0.15 g
Atomic absorption
Ax / 2 = 0.050
A (x + C1) / 2 = 0.116
A (x + C2) / 2 = 0.185
A (x + C3) / 2 = 0.320

Additional information:

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.