scholarly journals DETERMINATION OF NITRITE AS 4-(4-NITROBENZENAZO)-1-AMINONAPHTHALENE DYE USING OPTICAL MEMBRANES BASED ON PVC-DOS MATRIX

2010 ◽  
Vol 5 (3) ◽  
pp. 269-273
Author(s):  
Choirul Amri ◽  
Dwi Siswanta ◽  
Mudasir Mudasir
Keyword(s):  
Detection Limit ◽  
Linear Range ◽  
Polymeric Membrane ◽  
Optimum Conditions ◽  
Absorbance Unit ◽  
Membrane Method ◽  
Good For

A study of a liquid polymeric membrane based on polyvinylchloride-dioctylsebacate (PVC-DOS) as optical membrane for the spectrophotometric and visual determination of nitrite has been done. The method relied on the formation of a purple colored 4-(4-nitrobenzenazo)-1-aminonaftalen dye in the membrane. The result showed that liquid polymeric membrane can be used as an optical membrane for the determination of nitrite. Optimum conditions of method achieved at a wavelength of 525 nm, reaction pH of 1.7-1.8, and respon time of 45 minutes. This method gave linear range of concentration at 0.0-0.17 mg/L NO2--N, detection limit of 0.004 mg/L NO2--N, and sensitivity of 4.981+0.110 absorbance unit per mg/L of NO2--N. The spectrophotometric and visual optical membrane method by is good for the determination of nitrite at the concentration range of 0.01-0.11 mg/L NO2--N and 0.02-0.60 mg/L NO2--N, respectively. Keywords: Nitrite; 4-(4-Nitrobenzenazo)-1-aminonaphthalene; Optical Membrane.

Fluorescence Enhancement of the Doxycycline– Europium Ion–Sodium Dodecyl Sulfonate System and Doxycycline Determination

2012 ◽  
Vol 554-556 ◽  
pp. 1905-1908 ◽  
Author(s):  
Hai Yan Wang ◽  
Bao Xiu Jia ◽  
Yu Qin Li ◽  
Renliang Wang ◽  
Caihong Liu ◽  
...  
Keyword(s):  
Detection Limit ◽  
Fluorescence Intensity ◽  
Fluorescence Enhancement ◽  
Sodium Dodecyl ◽  
Linear Range ◽  
Optimum Conditions ◽  
Sodium Dodecyl Sulfonate ◽  
Europium Ion ◽  
Tablet Formulations

A new sepctrofluorimetric method for the determination of doxycycline (DC) was developed based on its enhancement of the fluorescence intensity of europium ion in the presence of sodium dodecyl sulfonate(SDS). The mechanism of fluorescence enhancement was studied. Optimum conditions for the determination of DC were also investigated. The linear range was 0.10- 3.00μg/mL. The detection limit was 1.3ng/mL. There was no interference from the excipients normally used in tablet formulations and the serum compositions. The proposed method was successfully applied to the determination of DC in tablets.

The Synthesis of P-Sulfonatephenylazocalix[8]Arene and its Analytical Application

2011 ◽  
Vol 306-307 ◽  
pp. 634-637
Author(s):  
Lu Lu Fan ◽  
Chuan Nan Luo ◽  
Hua Min Qiu ◽  
Zhen Lv ◽  
Fu Guang Lu
Keyword(s):  
Detection Limit ◽  
Linear Range ◽  
Analytical Application ◽  
Fluorescence Spectrometry ◽  
Optimum Conditions ◽  
Spectrometry Method ◽  
Solubility In Water ◽  
Spectral Activity ◽  
Good Solubility

A new kind of fluorescence spectrometry method for the determination of Rutin has been developed in the presence of p-sulfonatephenylazocalix[8]arene, which has good solubility in water and spectral activity. Under optimum conditions, the linear range was obtained over the 0.2～4.5μg/mL, and the detection limit was 1.949×10-3 μg/mL. This method was used to determinate the content of Rutin in pagodatree flowers and the results were satisfied. It offered potential advantages of simplicity and sensitivity.

scholarly journals DETERMINATION OF TRACE NITRITE AS 4-(4-NITROBENZENAZO)- 1-AMINONAPHTHALENE COMPLEX BY EXTRACTION-SPECTROPHOTOMETRY

2010 ◽  
Vol 9 (2) ◽  
pp. 254-260
Author(s):  
Choirul Amri ◽  
Dwi Siswanta ◽  
Mudasir Mudasir
Keyword(s):  
Detection Limit ◽  
Organic Solvents ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Limit Of Detection ◽  
Absorbance Unit ◽  
Extraction Spectrophotometry ◽  
Linear Concentration

A study of extraction-spectrophotometric method for the determination of trace nitrite as 4-(4-nitrobenzenazo)-1-aminonaphthalene complex using n-amylalcohol and chloroform as organic solvents has been done. Results of the study showed that extraction-spectrophotometric determination of nitrite using n-amylalcohol or chloroform was very sensitive and had low limit of detection. Extraction-spectrophotometric method of nitrite using n-amylalcohol gave range of linear concentration 0.000-0.054 mg/L NO2--N, detection limit of 2.09x10-4 mg/L NO2--N, and sensitivity of 34.514 ± 0.398 absorbance unit per mg/L of NO2--N. Meanwhile, extraction-spectrophotometric of nitrite using chloroform had range of linear concentration of 0.000-0.100 mg/L NO2--N, detection limit of 8.99x10-4 mg/L NO2--N, and sensitivity of 18.353 ± 0.456 absorbance unit per mg/L NO2--N.   Keywords: Nitrite Trace, 4-(4-Nitrobenzenazo)-1-Aminonaphthalene, Extraction-Spectrophotometry

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.

Chemiluminescence Enhancement Effect for the Determination of Acetaminophen with the Catalysis of Manganese Deuteroporphyrin (Mn(III)DP)

2013 ◽  
Vol 575-576 ◽  
pp. 249-252 ◽  
Author(s):  
Ying Jun Chao ◽  
Liang Xiao Xie ◽  
Wei Cao
Keyword(s):  
Detection Limit ◽  
Pharmaceutical Preparations ◽  
Peak Height ◽  
Enhancement Effect ◽  
Optimum Conditions ◽  
Chemiluminescence Intensity ◽  
Relative Standard ◽  
Alkaline Conditions ◽  
Flow Injection Chemiluminescence

It is found thatManganese Deuteroporphyrin (Mn(Ⅲ)DP) can greatly enhance the chemiluminescence intensity of luminol-hydrogen peroxide system in alkaline conditions. Basing on that fact a flow injection chemiluminescence (CL) method has been developed for the determination of acetaminophen. With the peak height as a quantitative parameter applying optimum conditions, the relative CL intensity was linear with acetaminophen concentration in the range of 1.0×10-9～1.0×10-7 g/mL with a detection limit of 2.8×10-10 g/mL. The relative standard deviation (RSD) was 2.7% for 2.0 x10-8 g/mL acetaminophen (n = 11). The proposed method held low detection limit and was successfully applied to determination of acetaminophen in pharmaceutical preparations.

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 %.

Spectrofluorimetric Determination of Bilirubin Using Enoxacine-Terbium Probe

2014 ◽  
Vol 556-562 ◽  
pp. 421-424 ◽  
Author(s):  
Wei Wei Bian
Keyword(s):  
Detection Limit ◽  
Fluorescence Intensity ◽  
Trace Amount ◽  
Optimum Conditions ◽  
Serum Samples ◽  
Buffer Solution ◽  
Spectrofluorimetric Method ◽  
Spectrofluorimetric Determination ◽  
Terbium Ion

A new spectrofluorimetric method was developed for determination of trace amount of bilirubin. Using enoxacine–terbium ion as a fluorescent probe, in the buffer solution of pH=5.8, BR can remarkably reduce the fluorescence intensity of the ENX-Tb3+ complex at λ=545nm and the reduced fluorescence intensity of Tb3+ ion is in proportion to the concentration of BR. Optimum conditions for the determination of BR were also investigated. The linear range and detection limit for the determination of BR are 1.0×10-7～4.5×10-6mol/L and 8.1×10-8mol/L. This method is simple, practical and can be successfully applied to assess BR in serum samples.

Ultrasensitive Chemiluminescence Detection of Indoleacetic Acid Catalyzed by Silver Nanoparticles

2011 ◽  
Vol 306-307 ◽  
pp. 1440-1443 ◽  
Author(s):  
Wen Wen Liu ◽  
Wei Hua Liu ◽  
Xue Min Mu ◽  
Pi Xue Gong ◽  
Wei Cao
Keyword(s):  
Silver Nanoparticles ◽  
Detection Limit ◽  
Flow Injection ◽  
Indoleacetic Acid ◽  
Optimum Conditions ◽  
Chemiluminescence Detection ◽  
Experimental Conditions ◽  
Acid Catalyzed ◽  
Flow Injection Chemiluminescence

A flow injection chemiluminescence (CL) method has been developed for the determination of indoleacetic acid (IAA). It is based on the fact that the weak CL of Ce(IV)-Ru(phen)32+ system is strongly enhanced in the presence of silver nanoparticles. Optimum conditions and possible mechanisms have been investigated. Under optimum experimental conditions, the linear range is from 1.0×10-8 – 6.0×10-7 g mL-1 with a detection limit 9.0×10-9 g mL-1

scholarly journals INTEGRATED GAS-LIQUID SEPARATOR-REACTOR FOR DETERMINATION Sn(II) AT TRACE LEVELS IN SOLUTION

2010 ◽  
Vol 10 (1) ◽  
pp. 51-57
Author(s):  
A. Sentosa Panggabean ◽  
M. Bachri Amran ◽  
Buchari Buchari ◽  
Subur P. Pasaribu
Keyword(s):  
Detection Limit ◽  
Hydride Generation ◽  
Optimum Conditions ◽  
Injection Volume ◽  
Optimum Parameters ◽  
Acid Reagent ◽  
Accuracy Of Measurement ◽  
Mixing Techniques ◽  
Liquid Separator

The determination of Sn(II) ion at trace levels using integrated gas-liquid separator-reactor with hydride generation-quartz furnace atomic absorption spectrophotometer (HG-QFAAS) has been done. This modified gas-liquid separator at various sizes was able to increase sensitivity in the determination of Sn(II) in solution. The acid reagent mixing techniques, sample and reductant optimally occurs in a coil reaction before they are going to the gas-liquid separators. The optimum conditions of parameter measurement in the determination of Sn ion with HG method are influenced by type and concentration of acid, and the concentration of reductant has been evaluated. This optimum parameters can increase of analytical performance simultantly, which is shown by detection limit 3.74 mg L-1 for 100 mL injection volume (3.74 pg Sn). The accuracy of measurement shown by the % recovery of the Sn determination in natural water sample at > 95%, indicate this technique is good to be applied for tin analysis at picogram level.   Keywords: Sn, hydride generation, gas-liquid reactor separator, QFAAS

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