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本文报道了萃取-分光光度法测定Cd,具有灵敏度高选择性好的特点。苯与磷酸三丁酯()(4∶1)混合液在pH5.0～8.0条件下可将Cd从含有0.1克离子/升碘的水溶液中提取出来,形成CdI_2·2,它与溴离子相互作用,形成Cd的碘-溴阴离子络合物,其反应为:CdI_2·2_((0))+Br[·CdI_2·Br]~-_((0))+,然后与罗丹明(pc)作用在其最适的酸度(4N H_2SO_4)下,波长为575nm时有最大吸收的有色离子缔合物。溴离子的最适浓度为0.4克离子/升,pc为2×10~(-4)M。
In this paper, extraction - spectrophotometric determination of Cd, with high sensitivity and good selectivity characteristics. The mixture of benzene and tributyl phosphate (4: 1) can extract Cd from aqueous solution containing 0.1 g of ions / liter of iodine at pH 5.0-8.0 to form CdI_2 · 2, which interacts with bromide The reaction of CdI_2 · 2_ ((0)) + Br [· CdI_2 · Br] ~ -_ ((0)) + followed by reaction with rhodamine (pc) The role of its optimum acidity (4N H_2SO_4), the wavelength of 575nm maximum absorption of colored ion-association. The optimum concentration of bromide ion is 0.4 g ion / liter, pc is 2 × 10 -4 M.