Sequential determination of multi-nutrient elements in natural water samples with a reverse flow injection system

An integrated system was developed for automatic and sequential determination of NO2−, NO3−, PO43−, Fe2+, Fe3+ and Mn2+ in natural waters based on reverse flow injection analysis combined with spectrophotometric detection. The system operation was controlled by a single chip microcomputer and labora...

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Bibliographic Details
Published in:Talanta (Oxford) 2017-05, Vol.167, p.166-171
Main Authors: Lin, Kunning, Ma, Jian, Yuan, Dongxing, Feng, Sichao, Su, Haitao, Huang, Yongming, Shangguan, Qipei
Format: Article
Language:English
Subjects:
Multi-nutrient elements
Reverse flow injection analysis
Sequential determination
Single chip microcomputer
Water samples
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Summary:An integrated system was developed for automatic and sequential determination of NO2−, NO3−, PO43−, Fe2+, Fe3+ and Mn2+ in natural waters based on reverse flow injection analysis combined with spectrophotometric detection. The system operation was controlled by a single chip microcomputer and laboratory-programmed software written in LabVIEW. The experimental parameters for each nutrient element analysis were optimized based on a univariate experimental design, and interferences from common ions were evaluated. The upper limits of the linear range (along with detection limit, µmolL−1) of the proposed method was 20 (0.03), 200 (0.7), 12 (0.3), 5 (0.03), 5 (0.03), 9 (0.2) µmolL−1, for NO2−, NO3−, PO43−, Fe2+, Fe3+ and Mn2+, respectively. The relative standard deviations were below 5% (n=9–13) and the recoveries varied from 88.0±1.0% to 104.5±1.0% for spiked water samples. The sample throughput was about 20h−1. This system has been successfully applied for the determination of multi-nutrient elements in different kinds of water samples and showed good agreement with reference methods (slope 1.0260±0.0043, R2=0.9991, n=50). [Display omitted] •Simultaneous determination of NO2−, NO3−, PO43−, Fe2+, Fe3+ and Mn2+ in natural waters.•The targeted elements were detected in water samples and showed good agreement with reference methods.•The advantages of low reagent consumption and high sample throughput were satisfied the criteria of Green Chemistry.•The compact automatic system is fully integrated and highly suitable for field application.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2017.01.063