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(一) 方法要点在微酸性溶液中四价硒与硒试剂作用形成黄色络合物。该络合物在近中性溶液中能被苯等有机溶剂所萃取,最后进行比色测定。硅钢中常见元素除铁以外,对测定无干扰,铁的干扰用EDTA消除。本方法适用于0.005—0.10％硒的测定(取样为0.1克)。 (二) 试剂和仪器 1,硝酸(1∶3) 2.硫酸(1∶2)。 3.EDTA二钠盐溶液(10％) 4.硒试剂3.3′-二胺基联苯胺盐酸盐溶液(0.5％)。 5.乙酸溶液:100毫升水与20毫升乙酸混合。 6.氨水(1∶1)。
(A) Method points In a slightly acidic solution, tetravalent selenium and selenium reagents form a yellow complex. The complex in near neutral solution can be benzene and other organic solvent extraction, the final colorimetric determination. Common elements of silicon steel in addition to iron, the determination of no interference, iron interference with EDTA to eliminate. This method is suitable for the determination of 0.005-0.10% selenium (sampling is 0.1 grams). (B) reagents and equipment 1, nitric acid (1: 3) 2 sulfuric acid (1: 2). 3.EDTA disodium salt solution (10%) 4. Selenium reagent 3.3’-diaminobenzidine hydrochloride solution (0.5%). 5. Acetic acid solution: 100 ml of water is mixed with 20 ml of acetic acid. Ammonia (1: 1).