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J. Braz. Chem. Soc. vol.19 número5

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Figure 1. Derivatization reaction of MX.
Figure 4. Effect that extraction time has on extraction efficiency,  [MX] = 1  g L -1
Figure 5. Electron impact mass spectrum and some fragment ions proposed for D-MX 18  for spiked deionised water sample, [MX] = 50 ng L -1 .
Table 2. Recovery of MX in deionised and chlorinated water samples Sample Recovery  (%)  MX = 30 ng L -1 Recovery  (%) MX = 50 ng L-1 Recovery  (%) MX = 100 ng L -1 deionised water 28   8 46   7 70  6 chlorinated water 1 --- 45   5 72  4 chlorinated water

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