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用激光喇曼光谱法研究了含钼0.2mol/L和pH值为9.0—1.5的各种钼酸溶液。由测得的喇曼光谱确定了溶液中钼的化学状态和钼酸根阴离子的种类。在pH值高于6.4时,钼以单核钼酸根阴离子MoO_4~(2-)存在。在pH值为6.4—1.5时,溶液中相继出现下列多核钼酸根阴离子和某些质子化产物:Mo_7O_(24)~(6-)、HMo_7O_(24)~(5-)、H_2Mo_7O_(24)~(4-)、H_3Mo_7O_(24)~(3-)、Mo_8O_(26)~(4-)、Mo_6O_(19)~(2-)和MoO_4~(2-)·(MoO_3)_(11)。提出了各种钼酸根阴离子之间的化学平衡与溶液pH值的关系。
Various molybdic acid solutions containing molybdenum 0.2 mol / L and pH 9.0-1.5 were studied by laser Raman spectroscopy. The measured Raman spectra determine the chemical state of molybdenum in the solution and the species of molybdate anion. At pH above 6.4, molybdenum is present as mononuclear molybdate anion MoO_4 ~ (2-). The following polynucleolytic molybdate anions and some of the protonated products were successively appeared in the solution at pH 6.4-1.5: Mo_7O_ (24) ~ (6), HMo_7O_ (24) ~ (5), H_2Mo_7O_ (24) (4 -), H_3Mo_7O_ (24) ~ (3 -), Mo_8O_ (26) ~ (4 -), Mo_6O_ (19) ~ (2-) and MoO_4 ~ (2-) · (MoO_3) __ (11). The relationships between the chemical equilibriums of various molybdate anions and the solution pH were proposed.