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本文用溶剂萃取电感耦合等离子体发射光谱法(ICP-AES)测定磷灰石矿物中的铀。使用3-苯基-4-苯甲酰基-5-异噁唑酮(HPBI)高酸度萃取剂(pK_A=1.23)和二异丁酮(DIBK)能使铀从很低pH范围内萃取出来,并与干扰元素分离,而且避免了磷酸钙的沉淀,磷灰石矿物用浓硝酸处理。在除去少量不溶性残渣之后,用0.06mol HPBL将铀萃入DIBK(pH0.3),以分离干扰元素。用ICP-AES测定铀,并直接注入DIBK相。选定波长367.01nm,得到最高的强度比,即在DIBK相中铀的发射强度对背景的比,和最好的检测限(0.02mg/L)。测得在磷灰石中铀的含量是(1.06±0.12)×10~(-2)%。
In this paper, solvent extraction of inductively coupled plasma-atomic emission spectrometry (ICP-AES) determination of uranium in apatite minerals. Uranium can be extracted from a very low pH range using 3-phenyl-4-benzoyl-5-isoxazolone (HPBI) high acidity extractant (pK_A = 1.23) and diisobutyl ketone (DIBK) And separated from interfering elements, but also to avoid the precipitation of calcium phosphate, apatite minerals with concentrated nitric acid treatment. After removing a small amount of insoluble residue, uranium was extracted with 0.06 mol HPBL into DIBK (pH 0.3) to separate interfering elements. Uranium was determined by ICP-AES and injected directly into the DIBK phase. The selected wavelength of 367.01 nm gives the highest intensity ratio, ie, the ratio of emission intensity of uranium to background in the DIBK phase, and the best detection limit (0.02 mg / L). Measured in the apatite uranium content is (1.06 ± 0.12) × 10 ~ (-2)%.