Dual flow-injection analysis system for determining bromide and reactive phosphorus in natural waters

✍ Scribed by Paul R. Freeman; Barry T. Hart; Ian D. McKelvie

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 888 KB
• Volume: 282
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)80224-9

✦ Synopsis

An inexpensive, dual flow-injection instrument for simultaneously determining low concentrations of both bromide and dissolved reactive phosphorus in natural waters is reported. An in-line C,, resin column was needed to remove interference in the bromide determination from dissolved organic matter present in most natural waters. The bromide method had a detection limit of 4 pg Br I-' and was linear over the range O-2 mg Br I-' with good precision [C.V. 5.3% at 0.1 mg Br I-' (n = 10) and 0.5% at 2.0 mg Br I-' (n = lo)]. The dissolved reactive phosphorus method had a detection limit of 0.6 pg P I-' and was linear over the range O-50 pg P 1-r with good precision [C.V. 2.9% at 2.0 pg P I-' (n = 3) and 0.5% at 50 pg P I-' (n = 3)]. The dual method can analyse 30 samples per hour when analysing P and Br sequentially (35 samples per hour in simultaneous analysis mode) and has been used in field experiments to determine the spiralling of phosphorus in Myrtle Creek, Australia.