Changes in Properties of Holocene Series during Storage in Thin Wall Tube Samplers

This study aims at investigation on changes of properties on Holocene Series during storage in thin wall tube samplers. Series of laboratory testing including color analysis, concentration testing of Arsenic (As), Fluorine (F) and Boron (B) in pore water, pH, oxidation reduction potential (ORP), density of soil particles and Atterberg's limits were performed on Holocene Series at immediately after sampling and after stored for 2 years in thin wall tube samplers. The results show that at almost the unchanged water content, color of Holocene Series was change from dark olive gray to brown and soil properties were changed as follows. Pore water concentrations of As, F and B changed arbitrarily. pH decreased from 8-9 to 4-6 in some samples. Density of soil particles decreased from 2.60-2.65 to 2.50-2.55. ORP increased from negative value to positive value which means that the condition of sample changed from reduction to oxidation. Based on these results, it is possible that the properties of Holocene Series are changed during storage due to oxidation process.