Ten sets of experiments with different settling times were conducted to investigate the effect of settling time on the adsorption of ¹³⁷Cs in seawater onto ammonium phosphomolybdate (AMP). The weight yields of AMP and ¹³⁷Cs yields in all groups were generally higher than 90%. The average weight yields of AMP in each group varied from 91.8 ± 0.5 to 95.9 ± 0.6% (1 SD), and the average ¹³⁷Cs yields in each group varied from 88.3 ± 3.0 to 97.8 ± 3.7% (1 SD). The results showed that equilibrium between Cs and AMP is established immediately after the addition of stable Cs carrier and AMP, implying that the solution could be filtered immediately after the coprecipitation forms. IAEA seawater proficiency test exercises also confirmed that the AMP precipitate does not need to be treated statically in the case of 2 g AMP and 3.7 mg Cs carrier in a seawater sample solution. The modified AMP preconcentration method simultaneously meets the requirements of routine and nuclear emergency monitoring of ¹³⁷Cs in seawater.

进行了十组具有不同沉降时间的实验，以研究沉降时间对海水中¹³⁷ Cs吸附在磷钼酸铵（AMP）上的影响。所有组中AMP的重量产率和¹³⁷ Cs的产率通常高于90％。每组AMP的平均产量为91.8±0.5％至95.9±0.6％（1 SD），平均¹³⁷每组的Cs产量从88.3±3.0到97.8±3.7％（1 SD）不等。结果表明，在加入稳定的Cs载体和AMP后立即建立Cs和AMP之间的平衡，这意味着在共沉淀形成后可以立即过滤溶液。IAEA海水能力测试还证实，在海水样品溶液中使用2 g AMP和3.7 mg Cs载体时，无需对AMP沉淀物进行静态处理。改进后的AMP预富集方法同时满足了对海水中¹³⁷ Cs的常规监测和核应急监测的要求。