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以碱性染料萃取-光度法测定锑,已有很久的历史,但长期以来多集中于研究SbCl_6~-络阴离子与不同类型的碱性染料之间的离子缔合作用,并采用苯及其同系物进行萃取。在此体系中,为保证锑以五价状态存在,必须先用氯化亚钖或亚硫酸钠将可能存在的Sb(Ⅳ)还原为Sb(Ⅲ),然后再用亚硝酸钠或硫酸铈等将三价锑氧化为五价,以后再除去过量的氧化剂。这不仅使操作繁冗,而且氧化-还原的好坏,常常影响到分析结果的准确度。同时由于SbCl_6~-系一价络阴离子,只能与一个碱性染料阳离子缔合,限制了反应的灵敏度,其摩尔吸
Determination of antimony by alkaline dye extraction-spectrophotometry has long been a long history. However, it has long been focused on the ionic association between SbCl_6-complex anions and different types of basic dyes. Benzene and its homologues Extract. In this system, in order to ensure that Sb exists in the pentavalent state, it is necessary to first reduce the possible Sb (IV) to Sb (III) with cuprous chloride or sodium sulfite, and then use sodium nitrite or cerium sulfate to separate the tris Antimony oxidation price pentavalent, and then remove excess oxidant. This not only makes the operation cumbersome, but also the oxidation-reduction is good or bad, often affect the accuracy of the analysis results. At the same time as SbCl_6 ~ - Department of monovalent anion, only with a basic dye cation association, limiting the sensitivity of the reaction, the molar absorption