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在铂的光度测定法中,以碱性染料为显色剂的具有较高灵敏度,其中浮选光度法较萃取比色法的灵敏度更高,这是因为浮选光度法的空白值极低,且铂被浓集为固体缔合物。文献曾报道罗丹明60-SnCl_2体系测定痕量铂的浮选光度法,其摩尔吸光系数ε达2.8×10~6L·mol~(-1)·cm~(-1)。本法研究铂-罗丹明B-SnCl_2体系,有更高的灵敏度,ε=3.4×10~5L·mol·cm~(-1),在SnCl_2和罗丹明B过量不太大的情况,可得到较好的重现性及极低的空白值(以水为参比A为0.006—0.01)。若在高浓度SnCl_2和罗丹明B条件,ε竟高达1.05×10~6L·mol~(-1)·
In the platinum photometry, the use of basic dyes as the reagent has a higher sensitivity, including flotation spectrophotometry than the extraction colorimetric sensitivity is higher, this is because the flotation spectrophotometry blank value is extremely low, And platinum is concentrated as a solid associate. The literature has reported the determination of trace platinum by rhodamine 60-SnCl 2 system flotation spectrophotometric method, the molar absorption coefficient ε of 2.8 × 10 6L · mol -1 cm -1. This method is more sensitive to platinum-rhodamine B-SnCl 2 system, ε = 3.4 × 10-5L · mol · cm -1. When the excess amount of SnCl_2 and rhodamine B is not too large, Better reproducibility and very low blank values (0.006-0.01 for water A). If the conditions of high concentrations of SnCl_2 and rhodamine B, ε as high as 1.05 × 10 ~ 6L · mol -1