Determination of ZrO2 and TiO2 in Alkali-Resistant Fiberglass Mesh by ICP OES

2017 ◽  
Vol 726 ◽  
pp. 65-69
Author(s):  
Qing Dan Yuan ◽  
Lin Cong ◽  
Peng Chen ◽  
Shi Hua Liu ◽  
Qian Nan Li
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Standard Method ◽  
Spectral Lines ◽  
Icp Oes ◽  
Fast Analysis ◽  
Relative Standard ◽  
Limit Of Quantitation ◽  
Two Samples

The content of ZrO2 and TiO2 in alkali-resistant fiberglass mesh was determined by ICP OES. The sample was pretreated by acid-soluble and alkali-fusion methods. Compared with the results of standard method, the results showed that the method can be used for the determination of ZrO2 and TiO2 in alkali-resistant fiberglass mesh. Standard solutions were prepared based on the content of elements. The best analysis of spectral lines was determined for each element. Blank solution was prepared and injected ten times continuously. The corresponding concentration of three times of standard deviation (3S) was used to calculate the detection limit of the method, and the detection limit was from 0.0018% to 0.0047%. The corresponding concentration of ten times of standard deviation (10S) was used to calculate the quantitation limit of the method, and the limit of quantitation was from 0.0060% to 0.016%. Six repeated tests were performed on two samples, and the relative standard deviations (RSDs (n=6)) of the test were from 0.60% to 0.78%. Compared to standard method, absolute error was less than 0.2% and the relative error was less than 2.0%. The results showed that the method can be used for simultaneous determination of ZrO2 and TiO2 in alkali-resistant fiberglass mesh., with fast analysis and reliable results.

Determination of Nitrate in Water by HPLC

2013 ◽  
Vol 448-453 ◽  
pp. 406-408
Author(s):  
Jing Liu ◽  
Xiao Na Ji ◽  
Qing Kai Ren ◽  
Sheng Shu Ai ◽  
Li Jun Wan ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Recovery Rate ◽  
High Performance ◽  
Separation Efficiency ◽  
Fast Analysis ◽  
Relative Standard

We established a method fordetermination of nitrate in water by High Performance Liquid Chromatography(HPLC). The sample was analysed by HPLC-ADA and was quantitated by externalstandard method after being simply processed. This methd has the advantages ofhigh separation efficiency and fast analysis. The experiment result showed thatthe linearly dependent coefficient was0.994, the recovery rate was between 98.7%～105.7%,the relative standard deviation（RSD）wasless than 2.1 %, and the lowest detectable limit is 0.01ng (S/N=1.6).

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

2018 ◽  
Vol 33 (2) ◽  
pp. 47
Author(s):  
Orlando Fatibello-Filho ◽  
Heberth Juliano 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.

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

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.

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

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 %.

Determination of Cl- and SO42- in Boric Acid

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.

scholarly journals DETERMINATION OF ACETATE IN FOODS BY ION CHROMATOGRAPHY-FLOW INJECTION

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.

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

2008 ◽  
Vol 33 (2) ◽  
pp. 47-54 ◽  
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.

scholarly journals Ultrasensitive determination of amoxicillin using chemiluminescence with flow injection analysis

2006 ◽  
Vol 20 (1) ◽  
pp. 37-43 ◽  
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%.

scholarly journals Determination of Manganese in Feedstuffs by Flow Injection Spectrophotometry Based on Rapid Formation of Permanganate at Room Temperature

2001 ◽  
Vol 84 (4) ◽  
pp. 1011-1016 ◽  
Author(s):  
Jing-Fu Liu ◽  
Ying-Di Feng ◽  
Gui-Bin Jiang
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Flow Injection ◽  
Room Temperature ◽  
Sampling Rate ◽  
Relative Standard ◽  
Rapid Flow ◽  
Rapid Formation ◽  
Optimized Conditions

Abstract A simple and rapid flow injection spectrophotometric procedure was developed for determination of manganese. In the presence of pyrophosphate and acetate, manganese was immediately oxidized to permanganate by periodate at room temperature in slightly alkaline medium. Under optimized conditions, the determination was made with a sampling rate of 120/h, a linear range of 0–30 mg/L Mn(II), a detection limit (S/N = 3) of 0.08 mg/L, and a relative standard deviation of 0.6% (n = 11) at 10 mg/L Mn(II). The proposed method was used to determine manganese in trace mineral premixes and feedstuffs. Results agreed well with those obtained by the standard atomic absorption spectroscopy method.

scholarly journals MEAN CENTERING OF RATIO SPECTRA METHOD FOR THE ANALYSIS OF THEOPHYLLINE AND EPHEDRINE HCL MIXTURE IN TABLET

2018 ◽  
Vol 11 (5) ◽  
pp. 218
Author(s):  
Muchlisyam Muchlisyam ◽  
Sudarmi Sudarmi ◽  
Cindy Caroline
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Spectrophotometric Method ◽  
Limit Of Detection ◽  
Standard Addition ◽  
Addition Method ◽  
Limit Of Quantification ◽  
Mean Centering ◽  
Relative Standard

 Objective: Mean centering of ratio spectra method (MCR method) is one of the simplest methods for the determination of drug mixtures. The purpose of this research is to determine the content of theophylline (THEO) and ephedrine HCl (EPH) in tablets by MCR spectra method.Methods: This research was conducted with the MCR method. It was measured at 271 nm for THEO and 257 nm for EPH using 0.1 N HCL as a solution. The calculation was conducted with Matlab application. The analytical characteristics of the method are detection limit, accuracy, precision, and selectivity. Standard addition method was used to increase the concentration of EPH in the sample until it reached the range of calibration concentration.Result: The research has showed that validations for THEO were 100.57% for accuracy, 0.68% for relative standard deviation (RSD), 0.46 μg/mL for limit of detection (LOD), and 1.52 μg/mL for limit of quantification (LOQ). Meanwhile, the validations for EPH are 100.02% for accuracy, 0.07% for RSD, 43.12 μg/mL for LOD, and 143.72 μg/mL for LOQ. The level of THEO is 97.43 ± 0.17% and the level of EPH is 101.36 ± 0.25% for brand one’s tablet. Meanwhile, brand two’s tablet contains 98.72 ± 0.14% of THEO and 103.62 ± 0.23% of EPH.Conclusion: MCR ultraviolet spectrophotometric method can be used to determine the content of THEO and EPH in tablets and meets the detection limit, accuracy, precision, and selectivity.

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