The amount of meat in prehistoric diets can be determined by measuring the ratio

Question

The amount of meat in prehistoric diets can be determined by measuring the ratio of the isotopes nitrogen-15 to nitrogen-14 in bone from human remains. Carnivores concentrate 15 N. so this ratio tells archaeologists how much meat was consumed by ancient people. Suppose you use a velocity selector to obtain singly ionized (missing one electron) atoms of speed 8.50km/s and want to bend them within a uniform magnetic field in a semicircle of diameter 21.0cm for the 12 C. The measured masses of these isotopes are 2.32 times 10-26kg (14N), 1.99 times 10-26kg (12C)and 2.49 times 10-26kg (15N). Find the separation of the 14 N and 15 N isotopes at the detector.

Explanation / Answer

hope this information helpful . ThanQ Separation of isotopically labeled [14N]/[15N] ammonium was performed with capillary electrophoresis. This ultrahigh-resolution separation was based on mobility counterbalance with precise control of the anodic electroosmotic flow. Mixtures of zwitterionic surfactant (Rewoteric AM CAS U) and cationic surfactant (cetyltrimethylammonium bromide) were used as buffer additives to modify the electroosmotic mobility. Indirect ultraviolet detection was used with benzyltributylammonium as the buffer coion. Baseline-resolved peaks of [14N]- and [15N]ammonium were obtained within 11 min. The detection limit was 0.01 mm for both [14N]- and [15N]ammonium. Linear calibration in concentration was observed up to 1.0 mm for [15N]ammonium and 2.0 mm for [14N]ammonium. Calibration of the isotopic ratio, [15N]ammonium concentration to total ([14N]- and [15N])ammonium, was valid from 5 to 95%.

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