ISSN:
1439-863X
Keywords:
Key words Pretreatment method
;
Hydrazinium reduction
;
Nitrate determination
;
Brackish water
;
Sep-Pak C18 cartridge
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The hydrazinium reduction technique has so far been inapplicable to the determination of nitrate in brackish water and seawater due to interference from magnesium ions. We developed a pretreatment method for brackish water and seawater samples for the determination of nitrate based on the hydrazinium reduction technique. Magnesium ions in water samples were converted to a precipitate of a complex with oxine (8-quinolinol) at pH 9.5, and then the precipitate was centrifuged at 3000 rpm for 20 min. The extra oxine in the resulting sample (the supernatant liquid), which inhibits the reduction of nitrate to nitrite, was removed using a Sep-Pak C18 cartridge. Thus we achieved the preparation of a magnesium-free water sample. Using the hydrazinium reduction technique with the proposed pretreatment method, nitrate in brackish water and seawater as well as fresh water was quantitatively determined with high accuracy.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s102010070018
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