26. For the chromatographic determination of nickel in margarine on paper impregnated with dimethylglyoxime solution, three standard solutions were prepared. To do this, a portion (a) of NiCl2*6H2O was dissolved in a 50 cm3 volumetric flask. Then 5.0 was taken from this flask; 10.0; and 20.0 cm3 and diluted in 50 cm3 flasks. The test sample of margarine weighing 5 g was dissolved in hot water and also diluted in a 50 cm3 volumetric flask.
Construct a calibration graph in h-CNi coordinates and determine the nickel content (mg) in the test solution if the peak height of the standard solutions is h1, h2, h3, and the peak height of the test solution is hx

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