The scope of this standard is the sludges, i.e. and sludges products from: storm water handling; night soil; urban wastewater collecting systems; urban wastewater treatment plants; treating industrial wastewater similar to urban wastewater (as defined in
Directive 911271 EEC); water supply treatment plants; water distribution systems; but excluding hazardous sludges from industry.
This method is applicable to the determination of pH values of sludges which include liquid, pastelike or solid matter. If the sludge sample is sufficiently liquid, direct measurement should be made. If the sludge sample contains relatively high percentages of solids the measurernent should be carried out after dilution with water.
Diese ÖNORM beschreibt ein Verfahren zur Bestimmung des pH-Wertes von schlammigen, pastösen und festen Stoffen. Enthält die Probe nur relativ wenig Wasser, muß die Messung nach Verdünnung mit Wasser durchgeführt werden.