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Analytical methods include radioimmunoassay [13,14] ELISA [14,15] gas chromatography (GC)-nitrogen-phosphorous detection (NPD) [16], GC-thermal energy analysis (GC-TEA) [17], GC-mass spectrometry (GC-MS) [18], liquid chromatography (LC)-electrochemical detection (ECD) [19], LC-tandem mass spectrometry (LC-MS/MS) and GC-MS/MS [20] (table 2).
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