FN Archimer Export Format
PT J
TI A flow injection-fluorometric method for the determination of ammonium in fresh and saline waters with a view to in situ analyses
BT 
AF AMINOT, Alain
   KEROUEL, Roger
   BIROT, Dominique
AS 1:;2:;3:;
FF 1:PDG-DEL-EC-EB;2:PDG-DEL-EC-EB;3:PDG-DEL-LT;
C1 IFREMER, F-29280 Plouzane, France.
C2 IFREMER, FRANCE
SI BREST
   LA TREMBLADE
SE PDG-DEL-EC-EB
   PDG-DEL-LT
IN WOS Ifremer jusqu'en 2018
IF 1.376
TC 64
UR https://archimer.ifremer.fr/doc/2001/publication-1722.pdf
LA English
DT Article
DE ;In situ;Fluorometry;Flow injection analysis;Determination;Ammonium
AB A version of the orthophthaldialdehyde-fluorescence ammonium determination for flow injection analysis (FIA) is presented here, with a view to its use for in situ, low-power consumption systems, Thus, the reaction temperature was limited to 30 degreesC and FIA was used in stop-Bow mode (3 min stop). The calibration is linear up to 50 mu mol l(-1), but concentrations up to 100 mu mol l(-1) can be measured. Repeatability is around 1% in the range of 0.5-4 mu mol l(-1) and the detection limit is about 0.03 mu mol l(-1) Over the salinity range of 5-35 (seawater practical salinity scale) the salt effect is almost negligible (within +/- 2%); and below salinity of 5 it increases to a maximum of -9% in fresh water compared to seawater. Hydrogen carbonate, dissolved oxygen and turbidity (either suspended sediments or phytoplankton cells) have almost no adverse effect in a wide range of concentrations, covering most natural water conditions. Relative interference of primary amines is negligible and mercury (a common sample preservative) does not depress the signal up to 20 mg l(-1) Hg II. Sulfide, that may be present in areas with anoxic waters, depresses the signal only slightly and linearly (-9% at 100 mu mol l(-1) S2-). The method appears to be convenient for the determination of ammonium in most coastal, estuarine and fresh waters. Sample throughput is 9 h(-1). The performance of the method can be improved, either by increasing the reaction time (low throughput) or, if enough energy is available, by increasing the reaction temperature (non-stop-flow mode, high throughput). Combining FIA and fluorometry appears to be interesting for in situ determination (submersible devices) of dissolved compounds in environments with variable salinity and turbidity (especially coastal and estuarine waters). (C) 2001 Elsevier Science Ltd. All rights reserved.
PY 2001
PD MAY
SO Water Research
SN 0043-1354
PU Elsevier
VL 35
IS 7
UT 000167987200018
BP 1777
EP 1785
DI 10.1016/S0043-1354(00)00429-2
ID 1722
ER

EF