54. Solution to Chemistry Problem

54. Solution to Chemistry Problem

1. When determining platinum elements (Pd, Pt, Rh, Ir), a sample weighing 1.0000 g was transferred to a solution of 10.00 ml after decomposition and appropriate processing. Samples of 100.00 μl of the resulting solution were placed in an electrothermal atomizer (graphite tube) of an automatic atomic absorption spectrophotometer and the absorption signal of the analytical line of the element was recorded on the chart recorder as a peak of height hх, mm.
To plot a calibration graph, 100.00 μl of standard solutions of platinum metal salts were successively introduced into the atomizer and the values ​​of the peaks h mm were measured. Cst(Pd), μg/ml 0.01 0.05 0.10
h (Pd), mm 8.5 45.0 90.0

Cst(Pt), μg/ml 0.04 0.08 0.12
h (Pt), mm 17.0 34.5 52.0

Cst(Rh), μg/ml 0.01 0.05 0.10
h (Rh), mm 12.0 59.0 118.0

Cst(Ir), μg/ml 0.10 0.20 0.40
h (Ir), mm 12.0 24.0 48.0

Calculate the concentration (g/t) of palladium, platinum, rhodium and iridium in the samples for the following options:
h, mm for line
Pd – 28.0
Pt – 31.0
Rh – 79.0
Ir – 21.0

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