【摘要】 研究了在pH5.6的HAc NaAc缓冲溶液中,溴化十六烷基吡啶(CPB)存在下,钼(Ⅵ)与溴邻苯三酚红及磺基水杨酸形成多元配合物的显色反应,建立了测定食品中微量钼的新方法。该配合物的最大吸收波长为λmax=620nm,表观摩尔吸光系数ε620=1.84×105L·mol-1·cm-1。钼(Ⅵ)浓度在0～0 80μg mL范围内符合比尔定律。应用于粮食作物中微量钼的测定,相对标准偏差小于4 8%,回收率为95.2%～100.5%。更多还原

【Abstract】 In the presence of acetic acid-sodium acetate buffer solution at pH 5.6 and cetylpyridine bromide medium, molybdenum（Ⅵ） reacted with bromopyrogallol red（BPR） and sulfosalicylic acid（Ssal） to form a colour complex. The maxinum absorption of the complex was at 620 nm and the apparent molor absorptivity was 1.84×10⁵ L·mol^-1·cm^-1. Beer′s law was obeyed in the range of 0～0.80 μg/mL for molybdenum（Ⅵ）. The method was applied to the determination of molybdenum in water and cereal samples with satisfactory results.更多还原