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Introducdon I. Reference materials for absorbance/transmi.ttance measurements Ultravialet absorbance 1. Potassium dichromate in aqueous sulphuric acid solution Visible absorbance 2. Copper sulphate in aqueous sulphuric aeid solution . 3. Cobalt aDIIIOnium sulphate in aqueous sulphuric acid solution 4. Cobalt and nickel nitrates in aqueous perchloric acid solution 5. Coloured glass filters Infrared transmittance 6. Rotating sectors . II.. Reference materiale for wavelength/wavenumber measurements Ul traviolet region 1. Low pressure discharge lamps containing cadmium, mercury or zinc 2. Hollow cathode discharge lamps . 3. Holmium (III) ions in aqueous perchloric acid solution Visible region . 4. Low p~;essure discharge lamps containing cadmium or mercury 5. Hollow cathode discharge lamps cont-aining calcium, strontium sodium, lithium or potassium 6. Holmium (III) ions in aqueous perchloric acid solution Inf~;ared region 7. Lasers 8. Air coritaining water vapour 9; Polystyrene film
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