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。

Trace uranium in plants

soils

and phosphate fertilizers was determined with the method of fluorescence analysis. The recovery of the procedure for 1

µ

g of added. uranium is 74%. The detection limit of the fluorophotometer is 5×10

-10

g

with a precision of 5%. The sensitivity of the method is 7.5×10

-9

g for 1g of ash of plants

6.4×10

-9

g for lg of soils

and 1.2×10

-8

g per g for 0.1g of phosphate fertilizers. The time required for determining three parallel samples is about 6 hours.