Noise studies for detection limits for some electrothermal atomic absorption determinations and calculation of the optimal detection limit from one atomization

1995 ◽  
Vol 10 (11) ◽  
pp. 993 ◽  
Author(s):  
A. Le Bihan ◽  
H. le Garrec ◽  
J. Y. Cabon ◽  
Y. Guern
Keyword(s):  
Detection Limit ◽  
Atomic Absorption ◽  
Detection Limits ◽  
Optimal Detection

Atomic Absorption Spectrometry with Absorption Tube Technique

1975 ◽  
Vol 29 (1) ◽  
pp. 58-63 ◽  
Author(s):  
Tetsuo Uchida ◽  
Chuzo Iida
Keyword(s):  
Detection Limit ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Memory Effect ◽  
Detection Limits ◽  
Absorption Spectrometry ◽  
Absorption Tube ◽  
External Heating ◽  
Manganese Copper ◽  
Sensitivity Detection

In atomic absorption spectrometry with the long absorption tube using a hydrogen-air flame and ring burner, the various effects such as the external heating of the tube, rate of exhaust of the burnt gas, and preheating of the aspirating air on the sensitivity, detection limit, and memory effect for 24 elements were studied. The optimal flame conditions were appreciably affected by the rate of exhaust of burnt gas. Preheating of the aspirating air resulted in 3 to 10% enhancement in sensitivity for silver, zinc, and antimony. By external heating of the tube, more than 40% enhancement in sensitivity was obtained for manganese, copper, gallium, silver, antimony, and bismuth. The detection limits were also lowered considerably for gallium, tin, antimony, mercury, and bismuth.

Polarographic and voltammetric determination of 6-mercaptopurine and 6-thioguanine

1986 ◽  
Vol 51 (11) ◽  
pp. 2466-2472 ◽  
Author(s):  
Jiří Barek ◽  
Antonín Berka ◽  
Ludmila Dempírová ◽  
Jiří Zima
Keyword(s):  
Detection Limit ◽  
Differential Pulse Voltammetry ◽  
Detection Limits ◽  
Differential Pulse ◽  
Voltammetric Determination ◽  
Differential Pulse Polarography ◽  
Hanging Mercury Drop Electrode ◽  
Pulse Polarography ◽  
Pulse Voltammetry

Conditions were found for the determination of 6-mercaptopurine (I) and 6-thioguanine (II) by TAST polarography, differential pulse polarography and fast-scan differential pulse voltammetry at a hanging mercury drop electrode. The detection limits were 10-6, 8 . 10-8, and 6 . 10-8 mol l-1, respectively. A further lowering of the detection limit to 2 . 10-8 mol l-1 was attained by preliminary accumulation of the determined substances at the surface of a hanging mercury drop.

scholarly journals The multivariate detection limit for Mycoplasma pneumoniae as determined by nanorod array-surface enhanced Raman spectroscopy and comparison with limit of detection by qPCR

The Analyst ◽  
2014 ◽  
Vol 139 (24) ◽  
pp. 6426-6434 ◽  
Author(s):  
Kelley C. Henderson ◽  
Edward S. Sheppard ◽  
Omar E. Rivera-Betancourt ◽  
Joo-Young Choi ◽  
Richard A. Dluhy ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Detection Limit ◽  
Mycoplasma Pneumoniae ◽  
Limit Of Detection ◽  
Bacterial Pathogen ◽  
Detection Limits ◽  
Nanorod Array ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

The detection limits by NA-SERS and qPCR for the bacterial pathogenMycoplasma pneumoniaewere compared.

Graphite Furnace Atomic Absorption Method for the Determination of Lead in Sugars and Syrups

1994 ◽  
Vol 77 (5) ◽  
pp. 1288-1292 ◽  
Author(s):  
Nancy J Miller-Ihli
Keyword(s):  
Detection Limit ◽  
Atomic Absorption ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Magnesium Nitrate ◽  
Method Detection Limit ◽  
High Fructose ◽  
Graphite Furnace Atomic Absorption ◽  
Characteristic Mass

Abstract A method was developed for the determination of lead in sugars and syrups. Samples are wet-ashed with a nitric acid–hydrogen peroxide procedure and analyzed by graphite furnace atomic absorption spectrometry. The method involves the use of magnesium nitrate as a matrix modifier, air ashing, platform atomization, and quantitation by peak area measurements with direct calibration against aqueous standards. The instrumental detection limit (based on 3.29σ) was 10 pg, or 0.5 μg/L for a 20 μL injection, corresponding to a method detection limit of 3.3 ng/g sugar. The characteristic mass was approximately 12 pg. This method was validated by analyzing sucrose and high-fructose corn syrup samples spiked with known quantities of lead. The average recovery was 101 ± 6%.

Selenium in Foods: Evaluation of Atomic Absorption Spectrometric Techniques Involving Hydrogen Selenide Generation and Carbon Furnace Atomization

1976 ◽  
Vol 59 (4) ◽  
pp. 911-922
Author(s):  
Milan Ihnat
Keyword(s):  
Detection Limit ◽  
Atomic Absorption ◽  
Absorption Spectrometry ◽  
Hydrogen Selenide ◽  
Matrix Interferences ◽  
Sulfuric Acid Medium ◽  
Absolute Detection Limit ◽  
Entrained Air ◽  
Furnace Atomization

Abstract The performance of hydrogen selenide generation- and carbon furnace atomization-atomic absorption spectrometry, with a semiautomated trace metal accessory and a carbon rod atomizer, respectively, was evaluated for the determination of selenium in foods. Samples were digested with nitric, perchloric, and sulfuric acids for both procedures. Hydrogen selenide was generated with stannous chloride/potassium iodide/zinc from 20 ml aliquots in a hydrochloric-sulfuric acid medium and directed into an argon-hydrogen-entrained air flame. Sample matrix interferences in the carbon furnace technique were minimized by isolating selenium by precipitation with ascorbic acid and redissolution in nitric-perchloric acid prior to taking 5 μl aliquots for estimation; precision was significantly improved by incorporating 5000 μg nickel/ml into analytical solutions. For the hydrogen selenide and carbon furnace techniques, respectively, the following data were obtained for untreated standard solutions: sensitivity, 0.15 and 10.0 ng/ml; absolute sensitivity, 2.6 and 0.05 ng; detection limit, 0.4 and 90 ng/ml; absolute detection limit, 7 and 0.45 ng. The detection limit and absolute detection limit for samples were 2.5 ng/ml and 50 ng, respectively, for the hydrogen selenide method, and 25 ng/ml and 0.15 ng, respectively, for the carbon furnace method. Taking into consideration these figures and the practical aspects of both methods, the overall performance of the hydrogen selenide method was superior.

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.

Transferability of blood lead determinations by furnace atomic absorption spectrophotometry and continuum background correction

1995 ◽  
Vol 41 (10) ◽  
pp. 1451-1454 ◽  
Author(s):  
H Qiao ◽  
P J Parsons ◽  
W Slavin
Keyword(s):  
Detection Limit ◽  
Atomic Absorption ◽  
Reference Materials ◽  
Human Blood ◽  
Blood Lead ◽  
Atomic Absorption Spectrophotometry ◽  
Absorption Spectrophotometry ◽  
Blood Specimens ◽  
Blood Lead Determination ◽  
The Continuum

Abstract We have examined and proved feasible the transfer of a method for blood lead determination, developed and optimized for a Zeeman-corrected instrument, to a continuum-corrected furnace atomic absorption spectrophotometer. Numerous reference materials analyzed with the continuum-corrected instrument gave results within 10 micrograms/L (0.05 mumol/L) at low values and varied by < 6% at values > 200 micrograms/L (0.97 mumol/L). Forty-four routine human blood specimens were analyzed by the same method with both continuum- and Zeeman-corrected instrumentation, and gave results that agreed within about the same limits as found with reference materials. The day-to-day precision was about 1/5 the accuracy results. The detection limit was approximately 5 micrograms/L (0.025 mumol/L).

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.

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