High concentration ammonium nitrate solution is easy to crystallize at room temperature, and the crystallization causes determination deviation of the concentration, which can produce adverse effect on the production and sale. In order to ensure that the sample is homogeneous, sampling must be carried out under the conditions of heat preservation and complete liquid state, which can ensure the correctness and representativeness of determination values of ammonium nitrate solution concentration.%高浓度硝酸铵溶液在常温下极易结晶，出现结晶时浓度测定值会发生很大的偏差，对生产和销售环节均会产生不良影响。所以，必须在严格保温条件下，整体物料无结晶完全呈液体状态时取样，从而使取到的样品是均匀的，这样才能保证高浓度硝酸铵溶液浓度测定值的正确和有代表性。
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