Ion pair-based liquid-phase microextraction combined with cuvetteless UV-vis micro-spectrophotometry as a miniaturized assay for monitoring ammonia in waters

1. Senra-Ferreiro, S.
2. Pena-Pereira, F.
3. Costas-Mora, I.
4. Romero, V.
5. Lavilla, I.
6. Bendicho, C.