German standard methods for the analysis of water, waste water and sludge; Sludge and sediments (group S); Determination of pH value in sludge and sediments (S 5)— 4 стр.
German standard methods for the analysis of water, waste water and sludge; Sludge and sediments (group S); Determination of pH value in sludge and sediments (S 5)— 4 стр.