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Journal of Analytical Methods in Chemistry
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Journal of Analytical Methods in Chemistry
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2013
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Article
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Fig 1
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Research Article
Determination of Morphine and Codeine in Human Urine by Gas Chromatography-Mass Spectrometry
Figure 1
Mass spectra of morphine (a) and codeine (b) in SIM mode with EI (+) source.
(a)
(b)