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有机溶液中微量铁的测定大多采用直接测定法,如抗坏血酸直接还原有机溶液中的铁,然后用邻菲啰啉光度法予以测定。也可用硫氰酸盐比色法测定。但在某厂的铀饱和有机相D2EHPA+TBP煤油溶液(以下简称有机溶液)中含有铀、磷、钼和其它有机物时,因为颜色较深且变化较大而干扰测定结果。硫氰酸盐比色法因和钼生成橙红色络合物也严重干扰铁的测定。
Determination of trace amounts of iron in organic solution mostly by direct determination, such as ascorbic acid direct reduction of iron in organic solution, and then measured by phenanthroline spectrophotometry. Also available thiocyanate colorimetric assay. However, when a plant contains uranium, phosphorus, molybdenum and other organic compounds in the uranium saturated organic phase D2EHPA + TBP kerosene solution (hereinafter referred to as organic solution), the determination result will be disturbed because the color is dark and varies greatly. Thiocyanate colorimetric method and orange molybdenum orange complex also seriously interfere with the determination of iron.