Journal of Analytical Methods in Chemistry / 2014 / Article / Tab 1 / Research Article
A Modified o -Phthalaldehyde Fluorometric Analytical Method for Ultratrace Ammonium in Natural Waters Using EDTA-NaOH as Buffer Table 1 The main analytical parameters of the typical reported OPA methods.
Samples Technology Reagent Reaction temperature Working range (nmol/L) LOQ (nmol/L) Reference Standard solution Manual OPA, mercaptoethanol Room temperature [7 ] Fresh water Flow injection OPA, Na2 SO3 , 85°C 250–20000 250 [8 ] Fresh/saline waters Flow injection OPA, Na2 SO3 , tetraborate 30°C 250–50000 250 [9 ] Seawater Manual OPA, Na2 SO3 , tetraborate Room temperature ND–10000 ND [10 ] Seawater Gas diffusion OPA, Na2 SO3 70°C ND–40000 ND [11 ] Seawater Flow injection OPA, Na2 SO3 65°C 100–600 100 [12 ] Seawater Autonomous batch analyzer OPA, Na2 SO3 Room temperature 200–1000 200 [13 ] Seawater Multipumping analyzer OPA, Na2 SO3 , tetraborate 63.5–86.5°C 13–1000 13 [14 ] Seawater Solid extraction technology OPA, Na2 SO3 , tetraborate 75°C 1.67–300 1.67 [15 ]
