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用邻苯三酚红(PR)-十二烷醇-三甲基溴化铵或二甲基双(十八烷基)氯化铵光度法测定钼已有报导,但钨钒干扰严重。我们研究了Mo(Ⅵ)-PR-CTAB(十六烷基三甲基溴化铵)三元络合物的吸收光谱特性,发现此络合物的λ_(最大)=570毫微米,ε=5.3×10~4,Mo:PR:CTAB=1:2:2,0—100微克钼/50毫升符合比尔定律。用于矿石中微量钼的测定,灵敏度较高,选择性较好,钒:钼和钨:钼分别为12.5:1和2.5:1时不干扰测定。方法较简便,重现性和准确度也较好。
The photometric determination of molybdenum with pyrogallol red (PR) -dodecanol-trimethyl ammonium bromide or dimethyl bis (octadecyl) ammonium chloride has been reported, but the interference of tungsten and vanadium is serious. We studied the absorption spectra of Mo (Ⅵ) -PR-CTAB (cetyltrimethylammonium bromide) ternary complex and found that λ_ (max) = 570 nm and ε = 5.3 × 10 ~ 4, Mo: PR: CTAB = 1: 2: 2,0-100 μg molybdenum / 50 ml Beer’s law is obeyed. It is used for the determination of trace molybdenum in ore with high sensitivity and good selectivity. The determination of vanadium: molybdenum and tungsten: molybdenum of 12.5: 1 and 2.5: 1 respectively does not interfere with the determination. The method is simple, reproducible and accurate.