Comparison of Sample Preparation Methods for Phosphorus in Grains and Stock Feeds

1968 ◽  
Vol 51 (4) ◽  
pp. 771-773
Author(s):  
Aaron E Rash
Keyword(s):  
Sample Preparation ◽  
Perchloric Acid ◽  
Sodium Molybdate ◽  
The Other ◽  
Acid Digestion ◽  
Preparation Methods ◽  
Commercial Feeds ◽  
Sample Preparation Methods ◽  
Good Agreement

Abstract The nitric-perchloric acid digestion, 22.070(b) and 22.073, for the determination of phosphorus in grains and stock feeds was compared with three other methods of sample preparation (destruction of organic material) : quinoline molybdate precipitation, perchloric-sulfuric-sodium molybdate digestion, and the plant method. The values obtained by the nitric-perchloric acid method were not in good agreement with those obtained by the other methods studied. Six samples of commercial feeds and one barley sample were analyzed. The barley sample gave very poor recoveries by method 22.073.

Sample preparation methods for determination of Cd, Pb and Sn in meat samples by GFAAS: use of acid digestion associated with a cold finger apparatus versus solubilization methods

2013 ◽  
Vol 5 (6) ◽  
pp. 1590 ◽  
Author(s):  
Eliézer Quadro Oreste ◽  
Richard Macedo de Oliveira ◽  
Adriane Medeiros Nunes ◽  
Mariana Antunes Vieira ◽  
Anderson Schwingel Ribeiro
Keyword(s):  
Sample Preparation ◽  
Acid Digestion ◽  
Cold Finger ◽  
Preparation Methods ◽  
Meat Samples ◽  
Sample Preparation Methods

Determination of Fluoride in Vegetation: A Comparative Study of Four Sample Preparation Methods

1975 ◽  
Vol 58 (6) ◽  
pp. 1135-1137 ◽  
Author(s):  
Marc A Van Den Heede ◽  
Aubin M Heyndrickx ◽  
Carlos H Van Peteghem ◽  
Wilfried A Van Zele
Keyword(s):  
Low Temperature ◽  
Sample Preparation ◽  
Dilute Acid ◽  
Acid Digestion ◽  
Citrate Buffer ◽  
Preparation Methods ◽  
Alkali Fusion ◽  
Low Temperature Ashing ◽  
Sample Preparation Methods

Abstract Four sample preparation methods (dilute acid digestion, concentrated acid digestion, alkali fusion, and low temperature ashing) for the determination of fluoride in vegetation are compared. A fluoride ion selective electrode is used for the final quantitative measurements. Ionic strength and pH are maintained by a concentrated citrate buffer. The highest sensitivity and reproducibility are obtained by low temperature ashing of the dry sample. Several vegetables, grown in the neighborhood of a glaze factory, were simultaneously analyzed by 2 of the methods, the dilute acid digestion and the low temperature ashing procedures. The higher fluoride content found with the latter technique is attributed to the complete mineralization of the sample.

scholarly journals Salmonella spp. in poultry carcass: evaluation of sample preparation methods and effect of storage under refrigeration on pathogen recovery

2012 ◽  
Vol 3 (1) ◽  
pp. 12 ◽  
Author(s):  
Ricardo Seiti Yamatogi ◽  
Carlos Roberto Padovani ◽  
Julia Arantes Galvão ◽  
Luciano Dos Santos Bersot ◽  
Jose Paes de Almeida Nogueira Pinto
Keyword(s):  
Sample Preparation ◽  
Production Process ◽  
The Other ◽  
Salmonella Spp ◽  
Preparation Methods ◽  
Pathogen Screening ◽  
Pathogen Recovery ◽  
Poultry Carcass ◽  
Sample Preparation Methods

The aim of the present study was to evaluate the use of different analytical units and the influence of storage under refrigeration on the detection of <em>Salmonella sp</em>. in naturally contaminated poultry carcasses. One hundred and thirty samples were collected during the production process soon after chilling (postchiller phase). Fifty-five samples were analyzed in up to 2 h after collection and 65 samples were analyzed after 72 h of storage. Pathogen screening was based on three different analytical units and a comparison was made between them. Carcasses were initially rinsed with 400 mL of diluent, and three different analytical units were incubated: total rinsing volume (TRV), a single 30 mL aliquot of the rinsing volume, and 25 g of skin from different areas of the carcass. Of all samples analyzed, 60% were positive for <em>Salmonella sp</em>. From the samples collected at the post-chiller phase, 57% were positive for the pathogen and 52.31% of these were detected by TRV; a better statistical performance (P&lt;0.05) when compared to the other analytical units. Of the refrigerated samples, 63% were contaminated, but there were no significant differences between analytical units (P&gt;0.05). There were no significant differences between the number of positive samples from the post-chiller phase and after 72 h of refrigeration. It was also seen that the use of different analytical units (one for the post-chiller phase and another for the refrigerated samples) in samples coming from the same production lot may give different results.

Sample Preparation Optimization for EDXRF Analysis of Portland Cement

1988 ◽  
Vol 32 ◽  
pp. 221-226
Author(s):  
Wayne Watson ◽  
Jim Parker ◽  
Anthony R. Harding
Keyword(s):  
Sample Preparation ◽  
Portland Cement ◽  
Preparation Methods ◽  
X Ray ◽  
Accuracy And Precision ◽  
Edxrf Analysis ◽  
Analytical Accuracy ◽  
Minimum Detection Limits ◽  
Sample Preparation Methods

AbstractVarious sample preparation methods for Energy Dispersive X-ray Fluorescence (EDXRF) analysis of Portland cement were compared in order to evaluate improvement in analytical accuracy and precision. Sample preparation requirements for EDXRF are slightly different than for Wavelength Dispersive X-ray Fluorescence (WDXRF), and the methods commonly used in WDXRF are not optimized for EDXRF. Primarily, the work focuses on techniques for producing a fused sample with the lowest practical concentration of lithium borate flux. Determination of minimum detection limits were made from samples with varying proportions of flux in order to evaluate analytical optimization. Ease and reproducibility of preparation of the sample was also considered.

Determination of Glimepiride in Human Plasma by LC-MS-MS and Comparison of Sample Preparation Methods for Glimepiride

2004 ◽  
Vol 60 (1-2) ◽  
Author(s):  
Hohyun Kim ◽  
Kyu Young Chang ◽  
Chang Hun Park ◽  
Moon Sun Jang ◽  
Jung-Ae Lee ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Human Plasma ◽  
Preparation Methods ◽  
Sample Preparation Methods
Sign in / Sign up

Export Citation Format

Share Document