CHEM 055L Lecture Notes - Lecture 3: Good Laboratory Practice, Atomic Absorption Spectroscopy, Calibration Curve
16 Sep 2019
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Chem 55l lab a3 photometric determination of manganese in steel: objectives. Introduce the concepts of standard addition determinations and calibrations constructed by linear regression (atomic absorption: will be used in later analytical studies. General procedures: solution photometry, known weight of steel is dissolved in diluted nitric acid, any carbon in sample is eliminated by treatment with potassium peroxodisulfate, conversion of mn2+ to mno4. Is undesirable and does not ordinarily occur. 3m hno3 (nh4)2s2o8 or k2s2o8 (1 g: steel samples (2, standard mn solution (15 ml) part ii, sample s1 (from part i, kio4 (0. 4 g, sample s1 (from part i, sample s2 (from part ii, kio4. Part i: preliminary steps: weigh duplicate steel samples to the nearest 0. 1 mg into individual 250 ml beakers. The sample size should weigh out to between 0. 3 and 1 g. check with the lab instructor.
