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采用溶解平衡法研究了(NH_4)_2HPO_4-NH_3·H_2O-H_2O系APT的溶解性能。随着氨水浓度增大,APT溶解度由略微下降转为较快上升,溶液中磷钨杂多酸浓度大幅降低,而同多钨酸根和正钨酸根浓度大幅升高。相同磷酸氢二铵浓度下(NH_4)_2HPO_4-NH_3·H_2O-H_2O系APT溶解度远大于(NH_4)_2HPO_4-H_2O系。
The dissolution properties of (NH_4) _2HPO_4-NH_3 · H_2O-H_2O series APT were studied by means of dissolution equilibrium method. With the increase of ammonia concentration, the solubility of APT changed from slight decrease to rapid increase. The concentration of phosphotungstic heteropolyacid in the solution decreased sharply while the concentration of homopolytungstate and orthotungstate increased significantly. Under the same concentration of ammonium hydrogen phosphate, the solubility of (NH_4) _2HPO_4-NH_3 · H_2O-H_2O is much higher than that of (NH_4) _2HPO_4-H_2O.