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微量铝的测定,多以络天青S或埃络菁R作显色剂,或在有阳离子表面活性剂、非离子表面活性剂、两性表面活性剂存在下,以络天青S、埃络菁R为显色剂进行测定。而在有混合表面活性剂存在下,以溴邻苯二酚红为显色剂的体系还未见报道。作者发现,在pH 8.5的硼砂缓冲介质中,在氯化十六烷基吡啶和乳化剂-OP存在下,铝与溴邻苯三酚红(BPR)的显色反应有强烈的增敏作用,络合物的λ_(max)=610nm,其表观摩尔吸光系数ε_(610)=6.7 × 10~4,比相应的二元络合物λ(max)红移了20nm,而灵敏度提高了近5倍。25ml中铝0～25μg符合比耳定律。用于稀土硅镁合金中铝的测定,结果令人满意。1 主要试剂与仪器铝标准溶液:称取纯金属铝片0.1000g于烧杯中,用NaOH(10%)5ml溶解,再用HCI(1+1)中和,并过量10ml,然后移入1000ml量瓶中,稀释至刻度,此溶液含铝100μg·ml~(-1)。再取此溶液配成2.oμg·ml~(-1)标准溶液,供试验用。 BPR溶液:0.05%乙醇(1+1)溶液 CPC溶液:0.1%乙醇(1+1)溶液 OP溶液:5%水溶液硼砂缓冲溶液:pH 8·5
Determination of trace amounts of aluminum, mostly Cyanuric S or Ethe cyanine R as a developer, or in the presence of cationic surfactants, non-ionic surfactants, amphoteric surfactants in the presence of Cyantin S, Jing R reagent for the determination. However, in the presence of a mixed surfactant, a system using bromocatechol red as a chromogenic reagent has not been reported yet. The authors found that the chromogenic reaction of aluminum with bromopyrogallol red (BPR) strongly sensitized in the presence of cetylpyridinium chloride and emulsifier-OP in a borax buffer medium at pH 8.5, The λ max of the complex was 610 nm, the apparent molar absorptivity ε 610 was 6.7 × 10 -4, red shifted 20 nm from the corresponding binary complex λ max, and the sensitivity increased nearly 5 times. 25ml aluminum 0 ~ 25μg consistent with Beer’s law. For the determination of aluminum in rare earth silicon-magnesium alloy, the results are satisfactory. 1 main reagents and equipment aluminum standard solution: Weigh 0.1000g pure aluminum plate in a beaker, dissolved in 5ml NaOH (10%), and then HCI (1 + 1) neutralization and excess 10ml, and then into the 1000ml flask , Diluted to the mark, this solution containing aluminum 100μg · ml ~ (-1). Then take this solution dubbed 2.oμg · ml ~ (-1) standard solution for the test. BPR solution: 0.05% ethanol (1 + 1) solution CPC solution: 0.1% ethanol (1 + 1) solution OP solution: 5% aqueous solution borax buffer solution: pH 8.5