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在硫酸介质中用草酸掩蔽铁,碲与溴离子和二安替比林甲烷生成离子缔合物经氯仿萃取后测定。络合物最大吸收为336nm。在25毫升显色液中,允许铁(Ⅲ)、二氧化钛、三氧化二铝各50毫克,氧化钙,氧化镁、二氧化硅、稀土氧化物各10毫克,铜、镍、锰各5毫克,磷、砷、镉各1毫克,钴400微克,锌250微克,钼160微克,铬、五氧化二钒各50微克,硒25微克,铋、铅各20微克,EDTA500毫克,抗坏血酸1.25克,硫酸铵1.5克,草酸6克。硝酸根有严重干扰。本法酸度允许范围较宽(1.6～4M硫酸)。样品经沉淀和萃取分离后,共存元素的允许量相应增加。方法易于掌握,同时又避免使用砷、苯、溴等毒物。
Oxalic acid was used to mask the ion association of tellurium with bromide and diantipyrylmethane in sulfuric acid media after chloroform extraction. The maximum absorption of the complex was 336 nm. In 25 ml of color developing solution, 50 mg each of iron (III), titanium dioxide and aluminum oxide, 10 mg each of calcium oxide, magnesium oxide, silicon dioxide and rare earth oxides, 5 mg each of copper, nickel and manganese, Phosphorus, arsenic and cadmium each 1 mg cobalt 400 micrograms zinc 250 micrograms molybdenum 160 micrograms chrome vanadium pentoxide each 50 micrograms selenium 25 micrograms bismuth and lead each 20 micrograms EDTA 500 mg ascorbic acid 1.25 g sulfuric acid 1.5 grams of ammonium and 6 grams of oxalic acid. Nitrate has serious interference. The law allows a wide range of acidity (1.6 ~ 4M sulfuric acid). After the sample is separated by precipitation and extraction, the allowable amount of coexisting elements is correspondingly increased. The method is easy to grasp, while avoiding the use of arsenic, benzene, bromine and other poisons.