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在pH范围分别为3.6—4.5和2.7—4.1的条件下,在2-羟苯乙酮肟存在时,钒(Ⅳ)和钒(Ⅴ)可定量地萃入氯仿中。对有机层进行测定,钒(Ⅳ)和钒(Ⅴ)分别在345和350nm处显示出最大的吸收。对钒(Ⅳ)在350nm波长处的行为也进行了研究。在380nm以外,钒(Ⅴ)吸收仍相当大,但是,钒(Ⅳ)在这范围内的吸收可忽略不计。对于钒(Ⅳ)和钒(Ⅴ)两种离子来说,即使4天以后,有机层的吸收也不会变化的。采用“Job”法测得所形成的络合物的组成比已确定为1:2(金属;配位体)。对于钒(Ⅳ)如钒(Ⅴ)的测定进行干扰研究,并提出了消除外来离子干扰的方法。在pH4条件下,钒(Ⅳ)和钒(Ⅴ)可定量地萃取;这种萃取法成功地用于同时测定1—3 μgmL~-1范围的钒(Ⅳ)和1—6μgmL~-1范围的钒(Ⅴ),分别在350nm和400nm测量其吸收。
Vanadium (IV) and vanadium (V) can be quantitatively extracted into chloroform in the presence of 2-hydroxyacetophenone oxime under the pH range of 3.6-4.5 and 2.7-4.1, respectively. The organic layer was measured and vanadium (IV) and vanadium (V) showed maximum absorption at 345 and 350 nm, respectively. The behavior of vanadium (IV) at a wavelength of 350 nm has also been studied. Vanadium (V) absorption remains quite large beyond 380 nm, however, the vanadium (IV) absorption in this range is negligible. For both vanadium (IV) and vanadium (V) ions, the absorption of the organic layer does not change even after 4 days. The composition ratio of the complex formed by the “Job” method has been determined to be 1: 2 (metal; ligand). For vanadium (Ⅳ) such as vanadium (Ⅴ) determination of the interference study, and to eliminate the interference of foreign ions. Vanadium (IV) and vanadium (V) can be quantitatively extracted at pH 4; this extraction method has been successfully used to simultaneously determine vanadium (IV) in the 1-3 μg mL -1 range and 1-6 μg mL -1 range Of vanadium (V), its absorption was measured at 350 nm and 400 nm, respectively.