Methods for Quantification of Lignosulphonate and Chloride in Gravel Wearing Courses

Due to oxidation, breakdown, and leaching, dust suppressants will be lost from the gravel load surface. Methods for residual dust suppressant concentration supervision are a valuable tool for estimating lift-length and optimal application rates, and, hence, efficiency of different products. The objective of this study was to identify methods for quantitative analyses of lignosulphonate and chloride, develop and adapt the methods for application on a gravel matrix, and validate the methods using samples collected in-situ. Results strongly suggest that the reliability and repeatability of the developed methods (23% for lignosulphonate and 30% for chloride, respectively) are acceptable for determination of relative variations in residual concentrations of dust suppressed gravel wearing courses.