By I. P. Alimarin and M. N. Petrikova (Auth.)
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57. The Detection of Lead (a) Reaction with potassium chromate. Described above. (b) Reaction of forming a complex thiocyanate.
This part is redissolved and the elements identified in Group V; (2) the sulphate precipitates are treated not with water, but with dilute hydrochloric acid, because the precipitates of cerium and thorium are only slightly soluble in water. The use of hydrochloric acid involves some change in the following parts of the analysis; (3) calcium is precipitated with sodium carbonate, not ammonium carbonate; and (4) barium sulphate is converted to carbonate by a longer treatment. The general procedure for analysing Group III is given below.
Using a pipette, extract about 10 τηλ of silver nitrate solution, measure out this volume exactly in one of the measuring Iron Element Potassium thiocyanate Reagents 7-5 7-5 Diameter, mm 0-82 0-41 Capillary dimensions 4-0 1-0 1:3,500,000 1:2,000,000 1:880,000 1:500,000 1-5 x lO"9 1-5 x lO"9 2 x 10-9 2 x 10-9 2-5 X lO"9 6 x 10-9 2 x lO"9 2 x 10-9 Height of For the given Height of For the given column of column of height of height of solution solution column column 1 cm 1 cm Minimum concentration In capillary Minimum detectable, g In prepared solution Absolute mass of element, g T H E OBSERVATION OF THE COLOUR OF SOLUTIONS IN CAPILLARIES OF D I F F E R E N T CROSS-SECTION Length, mm TABLE 7.