Rigaku Americas Corporation, 9009 New Trails Drive, The Woodlands, Texas, 77381, USA.
Applied Chemistry Course, Graduate School of Science and Technology, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki, 214-8571, Japan.
Chemosphere. 2020 Jun;248:126007. doi: 10.1016/j.chemosphere.2020.126007. Epub 2020 Jan 22.
Soluble and insoluble radioactive cesium in municipal solid waste incineration fly ash were analyzed by X-ray diffraction and gamma-ray spectrometry. A total of 60% of soluble radioactive cesium was determined using the Tessier extraction method, and it was almost same extraction rate with Japanese leaching test No.13. In addition, chloride compounds such as halite (NaCl) and sylvite (KCl) showed same behavior with soluble radioactive cesium, therefore, soluble radioactive cesium existed as a chloride (CsCl) with water solubility characteristics. Almost insoluble radioactive cesium trapped into silicate of crystalline phase or amorphous phase was eluted by hydrogen fluoride treatment. Radioactive Cs was released in three stages by heating treatment (untreated - 400 °C, 600 °C-800 °C, and 800 °C-1000 °C) according to decreasing amorphous content. The relationship between the concentrations of radioactive Cs and amorphous phase exhibited good linearity (R = 0.9278). Insoluble radioactive Cs was contained in inner part of the amorphous phase, and free radioactive cesium was determined from the concentration of the amorphous phase.
采用 X 射线衍射和伽马射线光谱法分析了城市固体废物焚烧飞灰中可溶性和不溶性放射性铯。采用 Tessier 提取法测定了 60%的可溶性放射性铯，其提取率与日本浸出试验 No.13 几乎相同。此外，氯化钠（NaCl）和氯化钾（KCl）等氯化物化合物与可溶性放射性铯表现出相同的行为，因此可溶性放射性铯以水溶性特征存在于氯化物（CsCl）中。几乎不溶性放射性铯通过氢氟酸处理被捕获到结晶相或无定形相的硅酸盐中洗脱。根据无定形含量的减少，通过加热处理（未处理-400°C、600°C-800°C 和 800°C-1000°C）将放射性 Cs 释放分为三个阶段。放射性 Cs 的浓度与无定形相之间表现出良好的线性关系（R=0.9278）。不溶性放射性 Cs 包含在无定形相的内部，并且从无定形相的浓度确定游离放射性铯。
