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使用λ＿（１９）分光光度计研究ＨＮＯ＿３介质中Ｕ（Ⅵ）和Ｐｕ（Ⅳ）的吸收光谱、四次微分谱以及共存的杂质离子对微分谱的影响，并分别采用微分谱上４１５ｎｍ处峰零值和４７２．５－４７９．５ｎｍ间的峰面积值计算Ｕ（Ⅵ）和Ｐｕ（Ⅳ）的含量。结果表明：当体系ＮＯ或ＨＮＯ＿３浓度处在１．５－３．０ｍｏｌ／ｌ之间时，用微分法测定Ｕ（Ⅵ）不必预先测定体系中的ＮＯ或ＨＮＯ＿３浓度，相对偏差＜５．５％；对于Ｐｕ（Ⅳ）的测定，相对偏差＜５．０％；对于Ｕ（Ⅵ）和Ｐｕ（Ⅳ）混合体系，当Ｕ／Ｐｕ比达到２００时，采用微分法仍可鉴定Ｐｕ（Ⅳ）的存在，这时，Ｐｕ（Ⅳ）测定的相对偏差＜６．０％。Ｐｕ（Ⅳ）的检测下限为５×ｌ０￣（－４）ｍｏｌ／ｌ。
The effect of U (Ⅵ) and Pu (Ⅳ) absorption spectra, fourth derivative spectra and coexisting impurity ions on the differential spectra of HNO_3 in HNO_3 media were investigated by λ_ (19) spectrophotometer. Values of U (Ⅵ) and Pu (Ⅳ) were calculated from the peak areas between 472.5 and 479.5 nm. The results showed that when the concentration of NO or HNO 3 was 1.5-3.0 mol / l, the determination of U (Ⅵ) by differential method did not need to pre-determine the concentration of NO or HNO 3 in the system, the relative deviation was less than 5.5% ; For the determination of Pu (Ⅳ), the relative deviation is less than 5.0%; for U (Ⅵ) and Pu (Ⅳ) mixed systems, the differential expression of Pu At this moment, the relative deviation of Pu (Ⅳ) determination is less than 6.0%. Pu (Ⅳ) detection limit of 5 × l0 ~ (-4) mol / l.