Tabata Masaaki, Haraguchi Ryota, Yada Mitsunori, Umehara Tomoya, Furukawa Mizuha
Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8501, Japan.
Department of Chemistry and Applied Chemistry, Graduate School of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8501, Japan.
Waste Manag. 2023 Oct 19;171:653-661. doi: 10.1016/j.wasman.2023.09.020.
Whenever houses are demolished or disasters occur, large quantities of building materials are discharged, which may contain asbestos. To prevent the damage caused by asbestos exposure, a rapid asbestos presence confirmation method is required at demolition sites or temporary disaster storage sites. It is difficult to confirm the presence of asbestos in waste building materials by simple observation. However, it can be confirmed by staining the materials with two dyes: methylene blue (MB) with positive charge, and erythrosine (RED-3) with negative charge, and using a stereomicroscope. The method was applied to samples collected from disaster and demolition sites. Asbestos was stained violet or reddish-purple, and the base material of the building materials remained blue. Using this method, even amateur workers can detect asbestos by means of an image in a different color than the building substrate. Furthermore, the present method detected asbestos more explicitly than the official method (JIS A 1482, 1483; detection limit is < 0.1%) recommended by the Japanese government. This cost-effective method is suitable for detecting asbestos at disaster and demolition sites. The mixture of MB and RED-3 formed nanoparticles of size 151 nm and surface charge of -34 mV that selectively stained asbestos. The staining mechanism was discussed.
每当房屋被拆除或灾难发生时，都会排放大量建筑材料，其中可能含有石棉。为防止石棉暴露造成损害，在拆除现场或临时灾难储存场所需要一种快速的石棉存在确认方法。通过简单观察很难确认废弃建筑材料中是否存在石棉。然而，可以通过用两种染料对材料进行染色来确认：带正电荷的亚甲基蓝（MB）和带负电荷的赤藓红（RED - 3），并使用体视显微镜。该方法应用于从灾难和拆除现场采集的样本。石棉被染成紫色或红紫色，而建筑材料的基材仍为蓝色。使用这种方法，即使是业余工人也可以通过与建筑基材不同颜色的图像检测石棉。此外，本方法比日本政府推荐的官方方法（JIS A 1482、1483；检测限<0.1%）更能明确检测到石棉。这种经济高效的方法适用于在灾难和拆除现场检测石棉。MB和RED - 3的混合物形成了尺寸为151 nm、表面电荷为 - 34 mV的纳米颗粒，该纳米颗粒选择性地对石棉进行染色，并对染色机制进行了讨论。
