How does pH Buffering work?
|Ideally, pH Buffering analysis is performed on both soil (aquifer materials) and groundwater samples at each location to determine the acidity of both acidic minerals and native groundwater. Two 250 mL amber glass bottles containing the sample (aquifer material or groundwater) are submitted to Microbial Insights. Acidity testing results are displayed on a plot of pH as a function of milliequivalents of base per kg of soil (meqv/kg soil). At the study site shown, existing subsurface pH is 5.1 which is well below the optimum range for Dehalococcoides ethenogenes suggesting possible inhibition of reductive dechlorination. Based on acidity testing, 75 meqv base/kg soil would be necessary to consume acidity and achieve a pH of 7. Armed with this acidity value, the base equivalents of the chosen alkaline material (provided by manufacturer or vendor), and the size of the treatment zone, site managers can then calculate the mass of alkaline material required and injection parameters.|