Determination of Magnesium With 8-Hydroxyquinoline—gravimetrically, Volumetrically and Colorimetrically

Extraction and Colorimetric Estimation of Certain Metals as Derivatives of 8-Hydroxyquinoline

“…Aluminum and magnesium through coupling of the 8-hydroxyquinoline derivatives with sulfaniüc acid, followed by colorimetric estimations in terms of the dyes so produced (2, 3); bismuth through extraction of the 8-hydroxyquinoline complex with a 3 to 1 acetone-amyl acetate mixture and color comparison of the extract (19); iron through solution of the precipitated ferric complex in ethanol followed by colorimetric observation of the resulting solution (16); magnesium (6,22), calcium (6, 22), and bismuth, aluminum, and zinc (21) through the colors produced by reactions of the 8-hydroxyquinoline de-rivatives with Folin's reagent (10); magnesium by addition of excess 8-hydroxyquinoline and colorimetric estimation of the excess after removal of the precipitated magnesium complex (14); magnesum by development of color through reaction of the precipitated derivative with ferric chloride in acetic acid (12); and iron (1), aluminum (1), and indium (16) through extraction of the colored complexes with chloroform and direct colorimetric observation of the diluted extracts.…”