DIN 38412-13 PDF

German standard methods for the examination of water, waste water and sludge; test methods using water organisms (group L); determination of oxygen production and oxygen consumption in an aquatic environment (SPG and SVG) by means of the light and dark bottle method (L 13) (determination of biogenic aeration rate)
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/1983