Practical considerations for the segmented-flow analysis of nitrate and ammonium in seawater and the avoidance of matrix effects SCIE SCOPUS KCI

Cited 1 time in WEB OF SCIENCE Cited 1 time in Scopus
Title
Practical considerations for the segmented-flow analysis of nitrate and ammonium in seawater and the avoidance of matrix effects
Author(s)
Rho, Tae Keun; Coverly, Stephen; Kim, Eun-Soo; Kang, Dong-Jin; Kahng, Sung-Hyun; Na, Tae-Hee; Cho, Sung-Rok; Lee, Jung-Moo; Moon, Cho-Rong
KIOST Author(s)
Rho, TaeKeun(노태근)Kang, Dong-Jin(강동진)Cho, Sung Rok(조성록)
Publication Year
2015-12
Abstract
In this study we describe measures taken in our laboratory to improve the long-term precision of nitrate and ammonia analysis in seawater using a microflow segmented-flow analyzer. To improve the nitrate reduction efficiency using a flow-through open tube cadmium reactor (OTCR), we compared alternative buffer formulations and regeneration procedures for an OTCR. We improved long-term stability for nitrate with a modified flow scheme and color reagent formulation and for ammonia by isolating samples from the ambient air and purifying the air used for bubble segmentation. We demonstrate the importance of taking into consideration the residual nutrient content of the artificial seawater used for the preparation of calibration standards. We describe how an operating procedure to eliminate errors from that source as well as from the refractive index of the matrix itself can be modified to include the minimization of dynamic refractive index effects resulting from differences between the matrix of the samples, the calibrants, and the wash solution. We compare the data for long-term measurements of certified reference material under two different conditions, using ultrapure water (UPW) and artificial seawater (ASW) for the sampler wash.
ISSN
1738-5261
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2369
DOI
10.1007/s12601-015-0064-7
Bibliographic Citation
OCEAN SCIENCE JOURNAL, v.50, no.4, pp.709 - 720, 2015
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
Subject
SEA; NITROGEN; WATER
Keywords
segmented-flow analysis (SFA); open tube cadmium reactor (OTCR); nitrate; ammonium; matrix effect; refractive index
Type
Article
Language
English
Document Type
Article
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
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