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磷的比色测定在文献中常见的有钼黄和钼蓝法。钼黄生色的原理是在某种浓度的酸溶液中,若有钼酸根、钒酸根和磷酸根存在,能结合成一种深黄色的络合物 P_2O_5·R_2O_3·22MoO_3·nH_2O。钼蓝生色的原理是在一定条件下,磷酸和钼酸所结合成的杂多酸(hetropoly acids)H_3[P(Mo_3O_(10))_4]·nH_2O(磷钼酸)在还原剂的作用下能还原成深蓝色的复杂氧化物(MoO_3+Mo_2O_3)。钼黄与钼蓝所显的颜色在一定条件下均符合于兰姆贝
Colorimetric determination of phosphorus in the literature are molybdenum yellow and molybdenum blue method. The principle of molybdate yellow color is the combination of P_2O_5 · R_2O_3 · 22MoO_3 · nH_2O with a yellowish complex in the presence of molybdate, vanadate and phosphate in a certain concentration of acid solution. The principle of molybdenum blue color is under certain conditions, the role of the hetropoly acids H_3 [P (Mo_3O_ (10)) _4] · nH_2O (phosphomolybdic acid) combined by phosphoric acid and molybdic acid in reducing agent Under can be reduced to dark blue complex oxide (MoO_3 + Mo_2O_3). Molybdenum yellow and molybdenum blue color under certain conditions are in line with Lambem