Apparatus
4.—4.1 Spectrophotometer, with 10 mm silica cells.
4.2 Percolation tubes, glass. Upper part: approximately 240 mm long, 18 mm internal diameter, lower part: approximately 120 mm long, 8 mm internal diameter.
4.—4.1 Spectrophotometer, with 10 mm silica cells.
4.2 Percolation tubes, glass. Upper part: approximately 240 mm long, 18 mm internal diameter, lower part: approximately 120 mm long, 8 mm internal diameter.