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

A Hydride Generation-Nanosilver Surface Plasmon Resonance Absorption Spectral Method for the Determination of Trace Se(IV)

2013 ◽  
Vol 749 ◽  
pp. 491-494
Author(s):  
Ai Hui Liang ◽  
Qing Ye Liu ◽  
Gui Qing Wen ◽  
Ting Sheng Li ◽  
Zhi Liang Jiang
Keyword(s):  
Surface Plasmon Resonance ◽  
Detection Limit ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Water Samples ◽  
Hydride Generation ◽  
Resonance Absorption ◽  
Surface Plasmon Resonance Absorption ◽  
Hcl Solution

In HCl solution, the Se (IV) was reduced to SeH2 by NaBH4, and absorbed by solution of ethanol-AgNO3. The Ag+ was reduced to nanosilver that exhibited surface plasmon resonance absorption (SPR) peaks at 292 nm and 420 nm. Under the selected conditions, the value at 292 nm was linear to the concentration of Se (IV) in the range of 0.08-2.0 μg/mL, a detection limit of 0.04 μg/mL. The proposed method was applied to detect Se (IV) in water samples, with satisfactory results.

Determination of Arsenic in Beer by Dry Ashing, Hydride Generation Atomic Absorption Spectroscopy

1989 ◽  
Vol 72 (2) ◽  
pp. 282-285 ◽  
Author(s):  
Ma Luisa Cervera ◽  
Ascensio Navarro ◽  
Rosa Montoro ◽  
Ramon Catala ◽  
Nieves Ybańez
Keyword(s):  
Organic Matter ◽  
Detection Limit ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Metal Content ◽  
Hydride Generation ◽  
Dry Ashing ◽  
Spanish Legislation

Abstract A method has been developed for determination of arsenic in beer. Organic matter is destroyed by the dry-ashing technique, the ash is dissolved in HC1, and hydrides of arsenic are generated by addition of sodium borohydride prior to atomization in a flame-heated quartz cell and atomic absorption spectroscopy measurement. The analytical features of the method are detection limit 0.1 ng/g beer, precision 8%, and recovery 97 ± 7%. The arsenic contents of different brands from Spain and other European countries were analyzed. In all samples, the arsenic levels found were well below maximum levels allowed in Spanish legislation (100 ng/g). The quantities of arsenic in Spanish beers do not differ from those found in foreign beers. No differences were found between bottled and canned beers, and no correlation exists between metal content and original specific gravity of the beers.

Dry Ashing, Hydride Generation Atomic Absorption Spectrometric Determination of Arsenic and Selenium in Foods

1982 ◽  
Vol 65 (3) ◽  
pp. 647-650 ◽  
Author(s):  
Gerard K H Tam ◽  
Gladys Lacroix
Keyword(s):  
Detection Limit ◽  
Atomic Absorption ◽  
Reference Materials ◽  
Hydride Generation ◽  
Spectrometric Method ◽  
Flameless Atomic Absorption ◽  
Dry Ashing ◽  
Atomic Absorption Spectrometric ◽  
Certified Values

Abstract A dry ashing, flameless atomic absorption spectrometric method was evaluated to determine arsenic and selenium in foods. Samples were dry-ashed with Mg(N03)2-MgO and dissolved in HC1. Selenate was reduced to selenite by boiling in 4N HC1, and arsenate to arsenite by treatment with KI. Hydrides of arsenic and selenium were generated by the addition of NaBH4 and were swept by nitrogen and hydrogen into a thermally heated silicate tube furnace. The detection limit was about 5 ppb for each element based on a 10 g sample. Analytical results obtained for several samples of NBS reference materials agreed with the certified values. The procedure was evaluated by another laboratory and results were satisfactory.

The Removal of Interference from Microwave Digestion Solution of Industrial Wastewater on the Determination of Arsenic

2014 ◽  
Vol 587-589 ◽  
pp. 625-628
Author(s):  
Ming Ming Yang ◽  
Hong Wei An
Keyword(s):  
Detection Limit ◽  
Microwave Digestion ◽  
Hydride Generation ◽  
Standard Addition ◽  
Absorption Spectrometry ◽  
Quantitative Detection ◽  
Nitrite Ion ◽  
Digestion Solution ◽  
Relative Standard

In existing literature ,there is no unified time for the evaporating excessive acid to microwave digestion solution of different samples. a new method was developed .The interference from nitrite ion and volatile nitrogen oxides which were generated during digestion were quickly removed by the adding urea and heating with boiling water. The interference from nitrate was studied. Optimized conditions of determination of arsenic with hydride generation atomic absorption spectrometry. The detection limit was 0.3μg·L-1 and minimum quantitative detection limit was 1.0μg·L-1, the relative standard deviation of standard addition method in sample was 1.1% and recovery from 98 % to 102%.

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.

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.

scholarly journals Determination of Arsenic in Tuul River and in Drinking Water, using HG-AAS with Electrically Heated Atomizer

2011 ◽  
pp. 78-85
Author(s):  
T Tsetsegmaa ◽  
Ts Darjaa ◽  
D Dorj
Keyword(s):  
Detection Limit ◽  
Arsenic Concentration ◽  
Hydride Generation ◽  
Detectable Amount ◽  
Absorption Method ◽  
The People ◽  
Arsenic In Groundwater ◽  
Aas Method ◽  
Academy Of Sciences

The electrothermal atomizer was installed in a Varian AA240FS AAS. This equipment was tested for determination of arsenic by hydride generation – atomic absorption method in water samples in the low μg/l range. Pre-reduction capability of KI investigated systematically and obtained as 2.5 %. Analytical parameters, that influencing for hydride formation NaBH4 and HCl concentrations are optimized and employed as 0.5 % and 8 mol/l accordingly.The detection limit for determination of arsenic by optimized HG-AAS with electrically heated atomizer was 0.3 μg/l. The accuracy is confirmed by optimized HG-AAS method with flame atomizer and by ICP-MS.Water samples were taken from the different places of Tuul river and from groundwater in the same area. It was found that the arsenic concentration in the river was low, around 3 ppb. The concentration of arsenic in groundwater was around the detection limit of method and no detectable amount of arsenic was found in the other. Concentration of arsenic in the Tuul river in these districts does not seem to be so high that it could affect the people living there. DOI: http://dx.doi.org/10.5564/pmas.v0i4.50 Proceedings of the Mongolian Academy of Sciences 2009 No.4 pp.78-85

Indirect Determination of the Pesticide Dimethoxydithiophosphate by Flow Injection Analysis with Liquid-Liquid Extraction and Atomic Absorption Spectrometry with Hydride Generation

1999 ◽  
Vol 82 (6) ◽  
pp. 1436-1442 ◽  
Author(s):  
Oroncio Jiménez de Blas ◽  
Josë Luis Pereda de Paz
Keyword(s):  
Detection Limit ◽  
Flow Injection Analysis ◽  
Hydride Generation ◽  
Absorption Spectrometry ◽  
Liquid Extraction ◽  
Organic Medium ◽  
Continuous Mode ◽  
Indirect Determination ◽  
Liquid Liquid Extraction

Abstract We developed a new procedure for the indirect determination of the organophosphorus pesticide dimethoxydithiophosphate (DDTP) by coupling, in continuous mode, flow injection analysis (FIA) with liquid-liquid extraction and atomic absorption spectrometry with hydride generation in the organic phase. Both continuous-mode extraction of the species Bi(DDTP)3 in isobutylmethylketone (IBMK) organic medium and the process of hydride(BiH3) generation in the same organic medium were optimized. The most suitable solvent of the reducing agent, NaBH4, was a 1 % solution of N,N-dimethylformamide in glacial acetic acid medium. Phase separation was accomplished with an original design that has been patented for use (Spain patent 10,118,929 Y). The hydride generated is transported by the FIA setup in continuous mode to the quartz cell where the analytical signal was measured. The procedure developed was rapid, continuous, and involved little manipulation, thus avoiding possible errors and contamination. Moreover, only small amounts (250 μL) of sample were required in the injection of the aqueous sample, and a volume of 30 μL was used in the injection of the organic phase extracted. The values obtained for the detection limit (5 ppb DDTP in the aqueous phase injected) and for precision (3.0%, expressed as coefficient of variation) are very acceptable in comparison with other procedures described in the literature. The accuracy obtained was in agreement with the imprecision of the method when it was applied to the aqueous samples. The procedure can be used for the analysis of surface waters subject to different types of treatment prior to their use for human consumption. For this type of water, European legislation permits pesticide concentrations up to 5 ppb, which is the value of the detection limit obtained in the proposed procedure.

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