Opt61-1 animal tissue sample mass m g burned in mufe

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61. Option 1
A sample of animal tissue mass m z burned in a muffle furnace and the residue was dissolved in diluted HCl and brine lanthanum to 5.00 ml to eliminate the interfering effect of phosphate ions.
The four equal portions of the sample solution were added equal volumes of standard solutions of calcium containing C0 = 0; C1 = 2.0; C2 = 4,0; C3 = 8.0 ug / ml of Ca and the same amount of lanthanum salt as a sample solution. In atomic absorption spectrophotometer measured absorbance of the analytical calcium line (422.67 nm)
Calculate the concentration of calcium (mg / kg) in the next sample using the calibration curve construction method additives:
Option 1
m = 0,15 g
Atomic absorption
Ah / 2 = 0.050
A (x + C1) / 2 = 0.116
A (x + C2) / 2 = 0.185
A (x + C3) / 2 = 0.320

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Problems on Optics
Many of the tasks of the "Collection of questions and tasks Analytical Chemistry", ed. Vasiliev VP
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