Tokyo Metropolitan Research Institute for Environmental Protection, 1-7-5 Shinsuna Koto, Tokyo, 136-0075, Japan.
The National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8567, Japan.
Chemosphere. 2021 Feb;265:128981. doi: 10.1016/j.chemosphere.2020.128981. Epub 2020 Nov 16.
Soil batch leaching tests are conducted worldwide to quantify the leaching of hazardous substances from contaminated soil. In the extracts of soil batch leaching tests, some inorganic substances such as arsenic and lead are released both in colloidal and dissolved form. Recent studies have found that soil colloidal particles with small diameters persist in the filtrate even after the extracts are filtered through a membrane filter (MF) with a pore size of 0.45 μm, and they might affect the concentration of arsenic or lead. This study evaluated the effects of 0.45- or 0.4-μm MF materials on filtrate turbidity and leaching concentrations of inorganic hazardous elements during batch leaching tests. Turbidity and arsenic and lead concentrations in the filtrates of the tested soil samples varied greatly depending on the MF material. These findings indicate that the MF material affects the removal rate of colloidal arsenic or lead and therefore affects the results of leaching tests.
土壤批式浸出试验在全球范围内进行，以量化受污染土壤中有害物质的浸出量。在土壤批式浸出试验的提取物中，砷和铅等一些无机物质既以胶体形式又以溶解形式释放。最近的研究发现，即使经过孔径为 0.45 μm 的膜过滤器（MF）过滤，直径较小的土壤胶体颗粒仍会残留在滤液中，并且可能会影响砷或铅的浓度。本研究评估了 0.45 μm 或 0.4 μm MF 材料对批式浸出试验中滤液浊度和无机有害元素浸出浓度的影响。测试土壤样品滤液的浊度和砷、铅浓度随 MF 材料的不同而有很大差异。这些发现表明 MF 材料会影响胶体砷或铅的去除率，从而影响浸出试验的结果。
