Biography:

In the past N. Chimpalee has collaborated on articles with D. Thorburn Burns. One of their most recent publications is Spectrofluorimetric flow-injection determination of calcium using calcein. Which was published in journal Analytica Chimica Acta.

More information about N. Chimpalee research including statistics on their citations can be found on their Copernicus Academic profile page.

N. Chimpalee's Articles: (12)

Spectrofluorimetric flow-injection determination of calcium using calcein

AbstractCalcium can be determined spectrofluorimetrically (λem = 520 nm, λex = 365 nm) based on its reaction with Calcein is strongly alkaline solution in a flow-injection system. The carrier stream was deionised water and the reagent streams were 0.6 M potassium hydroxide and 60 μg ml−1 Calcein. The injection rate was 50 h−1. The calibration graph was sigmoid, but, however, linear between 3.0 and 7.0 μg ml−1 Ca based on injection volumes of 250 μl. The relative standard deviation (n = 10) was 0.23% for 4 μg ml−1 Ca. The system has been applied to the determination of calcium is certified reference mineral samples.

Spectrophotometry/SpectrofluorimetrySpectrophotometric determination of copper after extraction of its chelate with bis(acetylacetone)ethylenediimine

AbstractCopper can be determined spectrophotometrically at 343, 370 and 545 nm, based on the reaction of copper(II) and bis(acetylacetone)ethylenediimine after extraction of the chelate into chloroform. The calibration graphs were linear up to 20 μg ml−1 copper at 343 nm, 80 μg ml−1 copper at 370 nm and 200 μg ml−1 copper at 545 nm. The relative standard deviation for the determination of 50 μg ml−1 of copper (at 545 nm) was 1.4% (n = 10). The system has been applied to the determination of copper in copper-based alloys and pig feeds.

Spectrofluorimetric flow-injection determination of calcium using calcein

AbstractCalcium can be determined spectrofluorimetrically (λem = 520 nm, λex = 365 nm) based on its reaction with Calcein is strongly alkaline solution in a flow-injection system. The carrier stream was deionised water and the reagent streams were 0.6 M potassium hydroxide and 60 μg ml−1 Calcein. The injection rate was 50 h−1. The calibration graph was sigmoid, but, however, linear between 3.0 and 7.0 μg ml−1 Ca based on injection volumes of 250 μl. The relative standard deviation (n = 10) was 0.23% for 4 μg ml−1 Ca. The system has been applied to the determination of calcium is certified reference mineral samples.

Spectrophotometry/SpectrofluorimetrySpectrophotometric determination of copper after extraction of its chelate with bis(acetylacetone)ethylenediimine

AbstractCopper can be determined spectrophotometrically at 343, 370 and 545 nm, based on the reaction of copper(II) and bis(acetylacetone)ethylenediimine after extraction of the chelate into chloroform. The calibration graphs were linear up to 20 μg ml−1 copper at 343 nm, 80 μg ml−1 copper at 370 nm and 200 μg ml−1 copper at 545 nm. The relative standard deviation for the determination of 50 μg ml−1 of copper (at 545 nm) was 1.4% (n = 10). The system has been applied to the determination of copper in copper-based alloys and pig feeds.

Spectrofluorimetric flow-injection determination of calcium using calcein

AbstractCalcium can be determined spectrofluorimetrically (λem = 520 nm, λex = 365 nm) based on its reaction with Calcein is strongly alkaline solution in a flow-injection system. The carrier stream was deionised water and the reagent streams were 0.6 M potassium hydroxide and 60 μg ml−1 Calcein. The injection rate was 50 h−1. The calibration graph was sigmoid, but, however, linear between 3.0 and 7.0 μg ml−1 Ca based on injection volumes of 250 μl. The relative standard deviation (n = 10) was 0.23% for 4 μg ml−1 Ca. The system has been applied to the determination of calcium is certified reference mineral samples.

Spectrophotometry/SpectrofluorimetrySpectrophotometric determination of copper after extraction of its chelate with bis(acetylacetone)ethylenediimine

AbstractCopper can be determined spectrophotometrically at 343, 370 and 545 nm, based on the reaction of copper(II) and bis(acetylacetone)ethylenediimine after extraction of the chelate into chloroform. The calibration graphs were linear up to 20 μg ml−1 copper at 343 nm, 80 μg ml−1 copper at 370 nm and 200 μg ml−1 copper at 545 nm. The relative standard deviation for the determination of 50 μg ml−1 of copper (at 545 nm) was 1.4% (n = 10). The system has been applied to the determination of copper in copper-based alloys and pig feeds.

Spectrofluorimetric flow-injection determination of calcium using calcein

AbstractCalcium can be determined spectrofluorimetrically (λem = 520 nm, λex = 365 nm) based on its reaction with Calcein is strongly alkaline solution in a flow-injection system. The carrier stream was deionised water and the reagent streams were 0.6 M potassium hydroxide and 60 μg ml−1 Calcein. The injection rate was 50 h−1. The calibration graph was sigmoid, but, however, linear between 3.0 and 7.0 μg ml−1 Ca based on injection volumes of 250 μl. The relative standard deviation (n = 10) was 0.23% for 4 μg ml−1 Ca. The system has been applied to the determination of calcium is certified reference mineral samples.

Spectrophotometry/SpectrofluorimetrySpectrophotometric determination of copper after extraction of its chelate with bis(acetylacetone)ethylenediimine

AbstractCopper can be determined spectrophotometrically at 343, 370 and 545 nm, based on the reaction of copper(II) and bis(acetylacetone)ethylenediimine after extraction of the chelate into chloroform. The calibration graphs were linear up to 20 μg ml−1 copper at 343 nm, 80 μg ml−1 copper at 370 nm and 200 μg ml−1 copper at 545 nm. The relative standard deviation for the determination of 50 μg ml−1 of copper (at 545 nm) was 1.4% (n = 10). The system has been applied to the determination of copper in copper-based alloys and pig feeds.

Spectrofluorimetric flow-injection determination of calcium using calcein

AbstractCalcium can be determined spectrofluorimetrically (λem = 520 nm, λex = 365 nm) based on its reaction with Calcein is strongly alkaline solution in a flow-injection system. The carrier stream was deionised water and the reagent streams were 0.6 M potassium hydroxide and 60 μg ml−1 Calcein. The injection rate was 50 h−1. The calibration graph was sigmoid, but, however, linear between 3.0 and 7.0 μg ml−1 Ca based on injection volumes of 250 μl. The relative standard deviation (n = 10) was 0.23% for 4 μg ml−1 Ca. The system has been applied to the determination of calcium is certified reference mineral samples.

Spectrophotometry/SpectrofluorimetrySpectrophotometric determination of copper after extraction of its chelate with bis(acetylacetone)ethylenediimine

AbstractCopper can be determined spectrophotometrically at 343, 370 and 545 nm, based on the reaction of copper(II) and bis(acetylacetone)ethylenediimine after extraction of the chelate into chloroform. The calibration graphs were linear up to 20 μg ml−1 copper at 343 nm, 80 μg ml−1 copper at 370 nm and 200 μg ml−1 copper at 545 nm. The relative standard deviation for the determination of 50 μg ml−1 of copper (at 545 nm) was 1.4% (n = 10). The system has been applied to the determination of copper in copper-based alloys and pig feeds.

Short communicationFlow-injection extraction spectrophotometric determination of bismuth as tetraiodobismuthate(III) with the tetramethylenebis(triphenylphosphonium) cation

AbstractBismuth can be determined spectrophotometrically at 495 nm after its extraction as tetramethylenebis(triphenylphosphonium) tetraiodobismuthate(III) into dichloromethane. The carrier stream is 2 M sulphuric acid and the reagent stream contains 2% (w/v) potassium iodine and 0.4% (w/v) tetramethylenebis(triphenylphosphonium) bromide. The injection rate is 20 h-1. The calibration graph is linear up to 20 μ ml-1 bismuth and the detection limit is 0.24 μ ml-1 bismuth, based on injection volumes of 250μl. The system has been applied to determination of bismuth in pharmaceutical samples.

Flow injection extraction spectrophotometric determination of nickel using bis(acetylacetone)ethylenediimine

AbstractNickel was determined by flow injection spectrophotometry at 370 nm after extraction of nickel(II) bis(acetylacetone)ethylenediiminate chelate into chloroform. The carrier stream was deionized water and the reagent streams were phosphate buffer (pH 7.0) and 1.5% (w/v) bis(acetylacetone)ethylenediimine solutions. The reaction stream was heated to 60°C and then cooled to room temperature prior to extraction into chloroform. The sampling rate was 18 h−1. The calibration graph was linear up to 25 μg ml−1 nickel, based on injection volumes of 250 μl. The relative standard deviation (n=10) was 0.98% for 20 μg ml−1 nickel. The system has been applied to the determination of nickel in nickel–copper alloys and in synthetic electroplating solutions.

Advertisement
Join Copernicus Academic and get access to over 12 million papers authored by 7+ million academics.
Join for free!

Contact us