Correction of Loss on Ignition in Slag Powder by ICP-AES

A spectrophotometric flow injection method for the determination of paracetamol in pharmaceutical formulations is proposed. The procedure was based on the oxidation of paracetamol by sodium hypochloride and the determination of the excess of this oxidant using o-tolidine dichloride as chromogenic reagent at 430 nm. The analytical curve was linear in the paracetamol concentration range from 8.50 x 10-6 to 2.51 x 10-4 mol L-1 with a detection limit of 5.0 x 10-6 mol L-1. The relative standard deviation was smaller than 1.2% for 1.20 x 10-4 mol L-1 paracetamol solution (n = 10). The results obtained for paracetamol in pharmaceutical formulations using the proposed flow injection method and those obtained using a USP Pharmacopoeia method are in agreement at the 95% confidence level.

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A Study on Gadolinium Sensitized Chemiluminescence System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.535-537.1337 ◽

2012 ◽

Vol 535-537 ◽

pp. 1337-1340 ◽

Cited By ~ 1

Author(s):

Chi Yang ◽

Nai Lin Ren

Keyword(s):

Standard Deviation ◽

Detection Limit ◽

Linear Relationship ◽

Relative Standard Deviation ◽

Optimum Conditions ◽

Chemiluminescence Intensity ◽

Experimental Conditions ◽

Relative Standard

A new chemiluminescence system was built by using gadolinium as sensitizer, and the analysis capabilities of this system was tested as below. The method is based on chemluminescence of Ce (IV)-SO32- sensitized by Gd3+-OFLX. The effects of some critical experimental conditions were discussed and the optimum conditions for chemluminescence emission were investigated. The linear relationship between the relative chemiluminescence intensity and the concentration of OFLX is in the range of 2×10-9 g/mL～5×10-7 g/mL with a detection limit of 1.0×10-9g/mL .The relative standard deviation is 2.8% (n=11) for a level of 5.0×10-7 g/mL. The method has been applied to the analysis of OFLX in tablets with satisfactory results.

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Cloud Point Extraction-Fluorimetric Combined Methodology for the Determination of Magnolol

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.699.34 ◽

2013 ◽

Vol 699 ◽

pp. 34-39

Author(s):

Li Liu ◽

Xia Shi Zhu

Keyword(s):

Standard Deviation ◽

Detection Limit ◽

Cloud Point ◽

Relative Standard Deviation ◽

Cloud Point Extraction ◽

Calibration Graph ◽

Optimum Conditions ◽

Relative Standard ◽

Triton X

A new Triton X-114 cloud point extraction combined with fluorometry method for analysis of magnolol in drug samples was developed. Under the optimum conditions, the calibration graph was linear in the range of 2.0-150.0ng/mL of magnolol in the initial solution with r = 0.9998. Detection limit (DL) was 0.03ng/mL (S/N=3) and the relative standard deviation (RSD) for 20.0ng/mL of magnolol was 2.79%(n=11). The method was successfully applied for the determination of magnolol in drug samples with satisfactory results.

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Spctrophotometric Determination of Trace Ruthenium by its Catalytic Effect on Oxidation of 3,5-DiBr-PADAP with KIO4

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.554-556.1999 ◽

2012 ◽

Vol 554-556 ◽

pp. 1999-2005

Author(s):

Zhi Rong Zhou ◽

Qun Wang ◽

Shu Yuan Zhang

Keyword(s):

Activation Energy ◽

Standard Deviation ◽

Detection Limit ◽

Catalytic Reaction ◽

Oxidation Reaction ◽

Catalytic Effect ◽

Optimum Conditions ◽

Potassium Periodate ◽

Relative Standard

A spectrophotometric method for the determination of ruthenium (III) is described, based on its catalytic effect on the oxidation reaction of 2-[(3,5-dibromo-2-pyridy)azo]-5-diethylaminophenol (3,5-diBr-PADAP) with potassium periodate in 0.008 mol/L sodium hydroxide medium and in the presence of OP emulsifier (p-iso-octyl phenoxy polyethoxy ethanol) at 100 °C. The above reaction is followed spectrophotometrically by measuring the decrease in the absorbance at 530 nm for the catalytic reaction of 3,5-diBr-PADAP. The calibration curve for the recommended method was linear in the concentration range over 0.04 µg/L–1.0 µg/L and the detection limit of the method for Ru (III) is 0.012 µg/L. The influence of the factors such as acidity, concentration of reactants, reaction time, temperature and co-existing ions on the reaction is discussed. The optimum conditions of reaction are established and some kinetic parameters are determined. The apparent activation energy of catalytic reaction is 100.48 kJ/mol. The relative standard deviation for the determination of ruthenium (III) at the concentration of 0.02 µg/25mL is calculated to be 2.30 % (n=11). In combination with distilled separation, the method has been successfully applied for the determination of trace ruthenium (III) in some ores and metallurgy products with the relative standard deviations (RSD) over 1.8 %–2.9 % and the recovery over 98.1 %–103.1 %.

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ICP-AES Determination of Sulfide and Sulfate Content in Pebble and Crushed Stone

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.726.70 ◽

2017 ◽

Vol 726 ◽

pp. 70-74

Author(s):

Qian Nan Li ◽

Man Li ◽

Qing Dan Yuan ◽

Dan Hua Xu

Keyword(s):

Sulfur Trioxide ◽

National Standard ◽

Crushed Stone ◽

Test Results ◽

Sulfate Content ◽

Pretreatment Method ◽

Relative Standard ◽

Weight Method ◽

Sulphur Trioxide

Generally, the content of sulfide and sulfate (expressed as a sulphur trioxide) in pebble and crushed stone for construction is low. So use the weight method specified in the national standard method for determination, is not only tedious and time consuming, but also not accurate enough. In this paper, with reference to the pretreatment method of the relevant national standard, rapid and accurate test results can usually be obtained for the determination of sulfur trioxide in and crushed stone for construction by using ICP-AES as a new method, greatly reducing the time of the experiment and improve the efficiency. According to the analysis of spectrum interference, 182.0 nm was selected as the best analysis of spectral line for sulfur. The detection line of this method (3S) was 0.016 mg/L, the recovery rate of the sample was between 93.3%-104.0%, and the relative standard deviation (n=6) of the parallel samples was less than 1.05%.

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Determination of Cl- and SO42- in Boric Acid

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.152-154.507 ◽

2012 ◽

Vol 152-154 ◽

pp. 507-512

Author(s):

Dian Ting Gong

Keyword(s):

Standard Deviation ◽

Detection Limit ◽

Boric Acid ◽

Linear Relationship ◽

Recovery Rate ◽

Heating Time ◽

Measuring Time ◽

Relative Standard ◽

Precision And Accuracy

Microcontents of Cl- and SO42- in boric acid were determined by photoelectricity turbidimetry with acid as medium. The effects of stabilizer, acidity of solution, content of precipitant, heating time and temperature as well as measuring time on the turbidity of the solution were studied. After above experiment parameters were optimized, in the measurements to determine SO42- in boric acid, the stabilizer was glycerine-ethanol (1:4), the precipitant was acidic BaCl2. The solution was shaked and heated, as a result, the adding sequence of reagents had no effects on results. The detection limit was 0.10mg/L, relative standard deviation (RSD) was less than 3%, recovery rate was 98.85%~103.00%, and measuring time last over 40min. SO42- concentration in the range of 0.33 mg/L ~0.83mg/L showed a linear relationship with turbidity. In the determination of chlorine, the stabilizer was glycerine, measuring time held in 40min, detection limit was 0.03mg/L, RSD was less than 4%, and recovery rate was 102.2%~106.5%. Cl- concentration in the range of 0.10 mg/L ~0.25mg/L showed a linear relationship with turbidity. Photoelectricity turbidimetry improve the precision and accuracy of the measurements. The method of turbidimetry to determine Cl- and SO42- in boric acid is simple, reliable, innocuous and applicable in practice.

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DETERMINATION OF ACETATE IN FOODS BY ION CHROMATOGRAPHY-FLOW INJECTION

Southern Brazilian Journal of Chemistry - Southern Brazilian Journal of Chemistry, Volume 28, No. 28, 2020 ◽

10.48141/sbjchem.v3.n3.1995.12_1995.pdf ◽

1995 ◽

Vol 3 (3) ◽

pp. 9-22

Author(s):

E. Esteve-Juan ◽

R. Puchades ◽

A. Maquieira

Keyword(s):

Standard Deviation ◽

Detection Limit ◽

Ion Chromatography ◽

Chromatographic Analysis ◽

Reference Method ◽

Spectrophotometric Detection ◽

Flow Rates ◽

Injection Volume ◽

Relative Standard

A method for acetate determination using IC separation and FI post-column spectrophotometric detection based on the La(OH)3-I2 reaction has been developed. The chromatographic conditions (eluants, flow-rates, sensitivity, and so on) and FI variables (length of coils, injection volume, pH, ... ) were optimized. Linearity was observed over the concentration range 0 to 1 gl-1 with HAc as standard (r = 0.9916) and a detection limit of 0.1 g AcH/l. The IC-FI method afforded a low relative standard deviation (3.6%) and was free from interferences. The IC-FI procedure was applied to the determination of acetate in mustard sauce and the results obtained agree with those provided by the reference method. Additionally, the developed method permits the simultaneous chromatographic analysis of other anions such as chloride, nitrate, phosphate, sulphate, and so on.

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Spectrophotometric flow injection procedure to indirect determination of paracetamol in pharmaceutical formulations using o-tolidine as reagent

Eclética Química ◽

10.1590/s0100-46702008000200007 ◽

2008 ◽

Vol 33 (2) ◽

pp. 47-54 ◽

Cited By ~ 3

Author(s):

O. Fatibello-Filho ◽

H. J. Vieira

Keyword(s):

Standard Deviation ◽

Detection Limit ◽

Flow Injection ◽

Pharmaceutical Formulations ◽

Injection Method ◽

Indirect Determination ◽

Analytical Curve ◽

Relative Standard ◽

Injection Procedure

A spectrophotometric flow injection method for the determination of paracetamol in pharmaceutical formulations is proposed. The procedure was based on the oxidation of paracetamol by sodium hypochloride and the determination of the excess of this oxidant using o-tolidine dichloride as chromogenic reagent at 430 nm. The analytical curve was linear in the paracetamol concentration range from 8.50 x 10-6 to 2.51 x 10-4 mol L-1 with a detection limit of 5.0 x 10-6 mol L-1. The relative standard deviation was smaller than 1.2% for 1.20 x 10-4 mol L-1 paracetamol solution (n = 10). The results obtained for paracetamol in pharmaceutical formulations using the proposed flow injection method and those obtained using a USP Pharmacopoeia method are in agreement at the 95% confidence level.

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Spectrochemical Analysis of Liquids Using the Laser Spark

Applied Spectroscopy ◽

10.1366/0003702844555034 ◽

1984 ◽

Vol 38 (5) ◽

pp. 721-729 ◽

Cited By ~ 326

Author(s):

David A. Cremers ◽

Leon J. Radziemski ◽

Thomas R. Loree

Keyword(s):

Standard Deviation ◽

Detection Limit ◽

Laser Pulse ◽

Aqueous Solutions ◽

Electron Density ◽

Relative Standard Deviation ◽

Sample Analysis ◽

Relative Standard ◽

Laser Spark ◽

Simple Molecules

A laser-generated spark was used to analyze liquids spectroscopically for elemental constituents The spark was produced directly in liquids by a focused laser pulse of 15 ns duration and an energy of about 45 mJ/pulse The size, temperature, and electron density of the spark are reported Emissions from once-ionized and neutral atoms and simple molecules were observed Limits of detection for Li, Na, K, Rb, Cs, Be, Mg, Ca, B, and Al in aqueous solutions were established with the use of a 10 Hz repetitive single spark (RSS) Most of these elements were only detectable at levels above 1 µg/mL, although the detection limit for Li was 0006 µg/mL The relative standard deviation for replicate sample analysis was 4–8% The detectability of some species was enhanced with the use of a 10 Hz repetitive spark pair (RSP): a pair of sparks separated in time by about 18 µs The detection limits for B/H2O with the RSP and the RSS were 80 and 1200 µg/mL, respectively Species were also detected in organic solvents and in flowing samples The laser spark method of liquid analysis would be useful in situations requiring noninvasive monitoring of species at high or moderate concentrations

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Ultrasensitive determination of amoxicillin using chemiluminescence with flow injection analysis

Spectroscopy An International Journal ◽

10.1155/2006/270417 ◽

2006 ◽

Vol 20 (1) ◽

pp. 37-43 ◽

Cited By ~ 2

Author(s):

Xiaofeng Xie ◽

Zhenghua Song

Keyword(s):

Hydrogen Peroxide ◽

Standard Deviation ◽

Detection Limit ◽

Flow Injection ◽

Pharmaceutical Preparations ◽

Chemiluminescence Intensity ◽

Relative Standard ◽

Human Urine And Serum ◽

Urine And Serum

Results presented here reveal that amoxicillin can greatly enhance the chemiluminescence intensity generated from the reaction between luminol and hydrogen peroxide. The increment chemiluminescence signal was linearly dependent on amoxicillin concentration in the range from 10 pg·ml−1to 2 ng·ml−1(r2=0.9978) offering a detection limit as low as 3.5 pg·ml−1(3σ). At a flow rate of 2.0 ml·min−1, one analysis cycle, including sampling and washing, can be accomplished in 20 s with a relative standard deviation of less than 5%. The sensitive flow injection method was applied successfully to determine of amoxicillin in pharmaceutical preparations, human urine and serum without any pretreatment procedure, with recovery from 90.0% to 110.0% and relative standard deviations of less than 5.0%.

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