A new HCl-free chromatographic separation procedure has been developed for sequential separation of Zr and Mo from concrete matrices for selective measurement of 93 Zr and 93 Mo by ICP-MS/MS. The recoveries of greater than 90% for Zr and Mo from concretes could be achieved. The measurement condition was optimized for complete suppression of interferences from 93 Nb and peak tailing from abundant isotopes of Zr and Mo in concrete matrices. The removal of interferences was verified by measurement of radio-contamination-free concretes used as a sample matrix blank. Method detection limits of 1.7 mBq g − 1 and 0.2 Bq g − 1 were achieved for, respectively, 93 Zr and 93 Mo in the concrete matrices. The interference removal factor for Nb (equivalent to the decontamination factor in radiochemical separation) was of the order of 10 5 , and the abundance sensitivity was of the order of 10 ─8 , indicating that the developed method is reliable for verifying the presence of ultralow concentrations of 93 Zr and 93 Mo. The present method is suitable for the rapid assessment of 93 Zr and 93 Mo for radioactivity inventory of concrete rubble.

中文翻译：

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开发无 HCl 固相萃取结合 ICP-MS/MS 以快速评估难以测量的放射性核素。第一部分：混凝土碎石中 93Zr 和 93Mo 的选择性测量

已开发出一种新的无 HCl 色谱分离程序，用于从混凝土基质中顺序分离 Zr 和 Mo，以通过 ICP-MS/MS 选择性测量 93 Zr 和 93 Mo。可以实现混凝土中 Zr 和 Mo 的回收率超过 90%。对测量条件进行了优化，以完全抑制 93 Nb 的干扰以及混凝土基质中丰富的 Zr 和 Mo 同位素的峰拖尾。通过测量用作样品基质空白的无放射性污染混凝土来验证干扰的消除。混凝土基质中 93 Zr 和 93 Mo 的方法检测限分别为 1.7 mBq g - 1 和 0.2 Bq g - 1。Nb 的干扰去除系数（相当于放射化学分离中的去污系数）约为 10 5 ，