Donaldson E M
Mineral Sciences Laboratories, Canada Centre for Mineral and Energy Technology, Department of Energy, Mines and Resources, Ottawa, Canada.
Talanta. 1976 November-December;23(11-12):823-7. doi: 10.1016/0039-9140(76)80094-x.
A method for determining 0.0001-0.10% of tellurium in copper, nickel, molybdenum, lead and zinc concentrates is described. After sample decomposition, tellurium is separated from most of the matrix elements by co-precipitation with hydrous ferric oxide from an ammoniacal medium. After reprecipitation of tellurium and iron, the precipitate is dissolved in 12M hydrochloric acid, tellurium(VI) is reduced to the quadrivalent state by heating, and separated from iron, lead and other co-precipitated elements by chloroform extraction of its xanthate. The yellow ion-association complex formed between tellurium(IV) hexabromide and diantipyrylmethane is extracted into chloroform from a 2M sulphuric acid-0.6M potassium bromide medium. The molar absorptivity of the complex is 1.82 x 10(3) l.mole(-1).mm(-1) at 336 nm, the wavelength of maximum absorption. Small amounts of iron, copper and molybdenum are co-extracted as xanthates under the proposed conditions but do not cause error in the result. Interference from antimony, which is co-extracted as the chloro-complex, is eliminated by washing the extract with water. The proposed method is also applicable to brasses.
本文描述了一种测定铜、镍、钼、铅和锌精矿中0.0001 - 0.10%碲的方法。样品分解后，碲在氨性介质中与水合氧化铁共沉淀，从而与大部分基体元素分离。碲和铁再沉淀后，沉淀溶解于12M盐酸中，通过加热将碲(VI)还原为四价态，并通过其黄原酸盐的氯仿萃取与铁、铅及其他共沉淀元素分离。在2M硫酸 - 0.6M溴化钾介质中，碲(IV)六溴化物与二安替比林甲烷形成的黄色离子缔合物被萃取到氯仿中。该络合物在最大吸收波长336nm处的摩尔吸光系数为1.82×10³ l·mol⁻¹·mm⁻¹。在所提出的条件下，少量的铁、铜和钼会以黄原酸盐形式被共萃取，但不会导致结果出现误差。以氯络合物形式被共萃取的锑的干扰，可通过用水洗涤萃取液来消除。所提出的方法也适用于黄铜。
