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- W1522434670 abstract "Abstract A differential-pulse polarographic procedure is described for the determination of impurities such as diisooctyl maleate and maleic acid in pharmaceutical products. The concentration range for diisooctyl maleate is 1 × 10 −6 −30 × 10 −6 μg ml −1 and the detection limit is 0.2 μg ml −1 ; for maleic acid the detection limit is 0.15 μg ml −1 . It is possible to determine very low concentrations of maleic acid in the presence of fumaric acid by a preseparation by dissolution in water, in which fumaric acid dissolves to only a small extent." @default.
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- W1522434670 date "1993-02-01" @default.
- W1522434670 modified "2023-09-27" @default.
- W1522434670 title "Determination of trace amounts of impurities in pharmaceutical preparations by differential-pulse polarography" @default.
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- W1522434670 doi "https://doi.org/10.1016/0003-2670(93)80174-j" @default.
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