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微量碲的分离一般采用砷盐共沉淀法此法虽可分离很多共存元素,但不能分离硒与大多数贵金属。本文采用阴离子交换树脂分离的方法,碲在4—6mol/L盐酸溶液中可定量地被717型阴离子交换树脂吸附,然后用0.5mol/L盐酸定量地洗脱。本法可有效地分离金、铂、钯、锡、甸、钴、镍、硒、镉、铜、铅及大部分的锑、锌铁等离子,但不能分离铊。测定时采用丁基罗丹明B光度法,回收率为96—105%,摩尔吸光系数为4×10~4。本法对不含铊及含铁量不高的试样,特别是含贵金属及硒的试样均可适用。方法结果可靠,操作简便主要试剂与仪器3mol/L HBr 1.4mol/LKBr溶液:称取41g溴化钾,加95mL溴氢酸,再加水至250mL,摇匀;1%丁基罗丹明B溶液;碲标准溶液按常规法配制;交换柱采用5、10mL微量滴定管;717型阴离子交换树脂处理和装柱:将若干g树脂
Separation of trace amounts of tellurium commonly used arsenic salt coprecipitation Although this method can be isolated a lot of coexistence of elements, but can not separate the selenium and most precious metals. In this paper, anion exchange resin separation method, tellurium in 4-6mol / L hydrochloric acid solution can be quantitatively 717 anion exchange resin adsorption, and then quantitatively eluted with 0.5mol / L hydrochloric acid. This method can effectively separate gold, platinum, palladium, tin, cadmium, cobalt, nickel, selenium, cadmium, copper, lead and most antimony, zinc and iron ions, but can not separate thallium. Determination of butyl rhodamine B photometry, the recovery rate of 96-105%, the molar absorption coefficient of 4 × 10 ~ 4. This method does not contain thallium and iron content of the sample is not high, especially with precious metals and selenium samples are applicable. The method is reliable and easy to operate. The main reagents and instruments are as follows: 3mol / L HBr 1.4mol / L KBr solution: Weigh 41g potassium bromide, add 95mL hydrobromic acid, add water to 250mL, shake; 1% butyl rhodamine B solution; Te standard solution prepared according to conventional methods; exchange column using 5,10 mL microtiter; 717 anion exchange resin treatment and packing: a number of g resin