Determination of nitrite in environmental waters by flow injection catalytic spectrophotometry

2018 ◽  
Vol 98 (12) ◽  
pp. 1095-1105
Author(s):  
Xin-feng Xiao ◽  
Yu-ying Deng
Keyword(s):  
Flow Injection ◽  
Environmental Waters ◽  
Catalytic Spectrophotometry

Online Monitoring of Trace Copper (II) in Environmental Waters

2012 ◽  
Vol 599 ◽  
pp. 188-191
Author(s):  
Liang Wei ◽  
Yi Chun Dai
Keyword(s):  
Online Monitoring ◽  
Atomic Absorption Spectrophotometry ◽  
Neutral Red ◽  
Environmental Waters ◽  
Experimental Conditions ◽  
Standard Curve ◽  
Relative Standard ◽  
Standard Solution ◽  
Catalytic Spectrophotometry

Based on the fact that copper can catalyze the fading reaction of neutral red reduced by hydrogen peroxide using the alanine as a sensitizer in NH4Cl-NH3•H2O medium (pH 8.0), a method was developed for online monitoring of trace copper in environmental waters by flow injection catalytic spectrophotometry. The experimental conditions were optimized. Under optimum conditions, the linear range of the proposed method was between 1.0 µg/L to 125 µg/L and the correlation coefficient of standard curve was 0.9995. The detection limit of the proposed method was 0.11 µg/L. The relative standard deviation of 2.7% and 1.5% was obtained by injecting 15.00 µg/L and 100.00 µg/L copper of standard solution respectively (n=8). The proposed method had been applied to determination of trace amounts of copper in environmental waters. The results were in good agreement with those obtained by atomic absorption spectrophotometry (AAS)

scholarly journals Automatic solid-phase extraction by programmable flow injection coupled to chromatographic fluorimetric determination of fluoroquinolones

2018 ◽  
Vol 10 (18) ◽  
pp. 2180-2186 ◽  
Author(s):  
Patricia S. Peixoto ◽  
Eduarda M. P. Silva ◽  
Marcelo V. Osório ◽  
Luisa Barreiros ◽  
José L. F. C. Lima ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Solid Phase Extraction ◽  
Flow Injection ◽  
Solid Phase ◽  
Phase Extraction ◽  
Environmental Waters ◽  
Fluorimetric Determination

Automatic sample preparation targeting preconcentration of fluoroquinolones present in environmental waters.

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