Abstract: The uncertainty in determination the chloride content in the leached liquid from clay, silty clay and silty soil samples is analyzed and quantified in this paper. The chloride content determination method in “Standard for geotechnical testing method” (GB/T 50123-2019) is used to evaluate the uncertainty. The results showed that the expanded uncertainty of the clay soil extract sample with the chloride content of 124.25 mg/kg was 0.075 mg/kg, the silty clay soil extract sample with the chloride content of 81.65 mg/kg was 0.05 mg/kg and the silt soil extract sample with chloride content of 81.65 mg/kg was 0.075 mg/kg. Meanwhile, factors that influence all uncertainty components of different soil samples are the same. The most contribution of the uncertainty was the volume of the silver nitrate in titration. Then, is the uncertainty from the induced repeatability of the measurement and is followed by the volume of the leached liquid from the soil samples.

Key words: Clay, Silty Clay, Silt Soils, Leached Liquid from Samples, Chloride Content, Influencing Factors, Uncertainty