Abstract Coal ash is one of the largest industrial waste streams in the United States and contains elevated concentrations of hazardous elements that could pose environmental and human health risks. Due to the relatively high strontium concentrations in coal ash and the distinctive 87Sr/86Sr ratios, strontium isotopes have been utilized to trace coal ash contaminants in impacted water resources. While previous studies have characterized the Sr isotope ratios for the water-soluble Sr derived from coal ash, the strontium isotopic composition of the bulk coal ash has not been systematically evaluated. In the current study, we report the 87Sr/86Sr ratios of bulk and water-soluble Sr in fly ash derived from coals of the three major coal-producing basins in the U.S., the Appalachian Basin, Illinois Basin, and Powder River Basin. The data show a wide range of 87Sr/86Sr ratios in the bulk fly ash samples (0.710788–0.722311), with the most radiogenic 87Sr/86Sr ratios in fly ash originating from Illinois Basin coals (0.718029 ± 0.003365; n = 16), followed by those from Appalachian Basin coals (0.712641 ± 0.000860; n = 16), and those from Powder River Basin coals (0.711663 ± 0.000489; n = 7). The 87Sr/86Sr ratios in the water leachates are significantly lower than the 87Sr/86Sr ratios of the bulk fly ash for Illinois Basin and Appalachian Basin (0.711660 ± 0.001172 and 0.710694 ± 0.000317, respectively, p-value

中文翻译：

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美国水溶性粉煤灰和散装粉煤灰锶同位素比的区别

摘要 煤灰是美国最大的工业废物流之一，含有高浓度的危险元素，可能对环境和人类健康构成威胁。由于煤灰中锶的浓度相对较高，而且 87Sr/86Sr 的比例不同，锶同位素已被用于追踪受影响水资源中的煤灰污染物。虽然之前的研究已经对源自煤灰的水溶性 Sr 的 Sr 同位素比率进行了表征，但尚未系统地评估散装煤灰的锶同位素组成。在目前的研究中，我们报告了来自美国三个主要产煤盆地（阿巴拉契亚盆地、伊利诺伊州盆地和粉河盆地）煤的粉煤灰中散装和水溶性 Sr 的 87Sr/86Sr 比率。数据显示散装飞灰样品中的 87Sr/86Sr 比率范围很广（0.710788-0.722311），其中来自伊利诺伊盆地煤的飞灰中放射性最强的 87Sr/86Sr 比率（0.718029 ± 0.003165）；其次是 = 0.003165来自阿巴拉契亚盆地煤炭 (0.712641 ± 0.000860; n = 16) 和粉河盆地煤炭 (0.711663 ± 0.000489; n = 7)。水浸出液中的 87Sr/86Sr 比率显着低于伊利诺伊州盆地和阿巴拉契亚盆地散装飞灰的 87Sr/86Sr 比率（分别为 0.711660 ± 0.001172 和 0.710694 ± 0.000317，p 值）和来自粉河盆地煤炭的那些 (0.711663 ± 0.000489; n = 7)。水浸出液中的 87Sr/86Sr 比率显着低于伊利诺伊州盆地和阿巴拉契亚盆地散装飞灰的 87Sr/86Sr 比率（分别为 0.711660 ± 0.001172 和 0.710694 ± 0.000317，p 值）和来自粉河盆地煤炭的那些 (0.711663 ± 0.000489; n = 7)。水浸出液中的 87Sr/86Sr 比率显着低于伊利诺伊州盆地和阿巴拉契亚盆地散装飞灰的 87Sr/86Sr 比率（分别为 0.711660 ± 0.001172 和 0.710694 ± 0.000317，p 值）