Improved detection limit for ammonium/ammonia achieved by Berthelot's reaction by use of solid-phase extraction coupled to diffuse reflectance spectroscopy

2005 ◽  
Vol 534 (2) ◽  
pp. 327-334 ◽  
Author(s):  
Y. Moliner-Martínez ◽  
R. Herráez-Hernández ◽  
P. Campíns-Falcó
Keyword(s):  
Detection Limit ◽  
Solid Phase Extraction ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Solid Phase ◽  
Reflectance Spectroscopy ◽  
Phase Extraction

scholarly journals Preconcentration of Copper with Solid Phase Extraction and its Determination by Flame Atomic Absorption Spectrometry

2008 ◽  
Vol 5 (4) ◽  
pp. 878-883 ◽  
Author(s):  
Ayob Parchehbaf Jadid ◽  
Habibollah Eskandari
Keyword(s):  
Detection Limit ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Copper Ions ◽  
Absorption Spectrometry ◽  
Phase Extraction ◽  
Flame Atomic Absorption ◽  
Low Levels ◽  
Determination Of Copper

A new method for the solid phase extraction (SPE) and determination of copper ions at low levels is presented. Extraction percent and the effects of some factors were evaluated. The detection limit was in the range of 2.26 µg·L-1. This procedure has been successfully applied to determination of copper in water samples.

scholarly journals Cadmium in Water Samples determined by Atomic Absorption Spectrometry after Solid Phase Extraction using DOWEX 50WX2 resin

2021 ◽  
Vol 6 (1) ◽  
pp. 14-19
Author(s):  
Yuniar Yuniar ◽  
◽  
Siti Nuraini
Keyword(s):  
Detection Limit ◽  
Solid Phase Extraction ◽  
Atomic Absorption Spectrometry ◽  
Flow Rate ◽  
Water Samples ◽  
Solid Phase ◽  
Tap Water ◽  
Absorption Spectrometry ◽  
Phase Extraction ◽  
Optimum Conditions

The Pre-concentration of Cd(II) in water samples was carried out by using column solid phase extraction DOWEX 50WX2 prior to flame atomic absorption spectrometry analyzed. The analytical parameters consist of pH, flow rate, volume of eluent and volume of sample were determined.The optimum conditions were obtained pH was 5, sample flow rate was 1 mL min−1, volume of eluent nitric acid 1N was 10 mL and sample volume was 50 mL. The optimum conditions obtained were used to determine the detection limit and the accuracy of the method using tap water samples. Determination of detection limit used tap water which contain Cd 0.001 mg L-1 and the accuracy (recovery,%R) with concentration of Cd 0.01 mg L-1. The detection limit was found 0.2697±0.0899 µg L− 1 (n=7) and accuracy (n=7) was 93±6%. The result showed the accuracy still meets the acceptance criteria for accuracy (70%-125%) and the RSD 6% is smaller than the Horwitz value of 20.8%. Based on the accuracy (R%) and % RSD values obtained, it can be concluded that this method provides effective results for pre-concentration to increase the detection limit of Cd (II)in clean water using SSA-flame.

scholarly journals Simple and Fast Methods Based on Solid-Phase Extraction Coupled to Liquid Chromatography with UV Detection for the Monitoring of Caffeine in Natural, and Wastewater as Marker of Anthropogenic Impact

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Sònia Moret ◽  
Manuela Hidalgo ◽  
Juan M. Sanchez
Keyword(s):  
Detection Limit ◽  
Solid Phase Extraction ◽  
Natural Waters ◽  
Wastewater Treatment Plants ◽  
Solid Phase ◽  
Sample Volume ◽  
Uv Detection ◽  
Phase Extraction ◽  
Method Detection Limit ◽  
Spe Method

Two concentration methods for fast and routine determination of caffeine (using HPLC-UV detection) in surface, and wastewater are evaluated. Both methods are based on solid-phase extraction (SPE) concentration with octadecyl silica sorbents. A common “offline” SPE procedure shows that quantitative recovery of caffeine is obtained with 2 mL of an elution mixture solvent methanol-water containing at least 60% methanol. The method detection limit is 0.1 μg L−1 when percolating 1 L samples through the cartridge. The development of an “online” SPE method based on a mini-SPE column, containing 100 mg of the same sorbent, directly connected to the HPLC system allows the method detection limit to be decreased to 10 ng L−1 with a sample volume of 100 mL. The “offline” SPE method is applied to the analysis of caffeine in wastewater samples, whereas the “on-line” method is used for analysis in natural waters from streams receiving significant water intakes from local wastewater treatment plants.

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