【摘要】 某些磷酸盐矿铀的品位达万分之三,所以随着磷肥在农业上日趋广泛地应用,农作物中铀的含量有增加的倾向。因此有必要对磷肥、土壤、农作物样品进行铀含量测定。这就必须建立一个灵敏、准确可靠的方法来测定这些样品中的铀含量。 荧光法灵敏度与分光光度法、目视荧光法相比要高2～3个数量级。因此对铀含量极微的农作物子粒(10^-6gU/kg)、土壤(10^-7～10^-6gU/g)等,用荧光法测定则可得到较为满意的结果。 本文用荧光分析法测定含铀量极微的农作物子粒、土壤中的铀和低品位铀含量磷肥中的铀。更多还原

【Abstract】 Trace uranium in plants, soils, and phosphate fertilizers was determined with the method of fluorescence analysis. The recovery of the procedure for 1 μg of added uranium is 74%. The detection limit of the fluorophotometer is 5×10-10g, with a precision of 5%. The sensitivity of the method is 7.5×10-9g for 1g of ash of plants, 6.4×10-9g for 1g of soils, and 1.2×10-8g per g for .01g of phosphate fertilizers.The time required for determining three parallel samples is about 6 hours.更多还原