Ruggedness Test for Ashing Methods in Feed: Comparison of Proposed Method of the International Organization for Standardization with AOAC Method

1977 ◽  
Vol 60 (4) ◽  
pp. 842-844
Author(s):  
Laszlo Torma
Keyword(s):  
Mineral Content ◽  
Statistical Evaluation ◽  
International Organization ◽  
Test Portion ◽  
International Organization For Standardization ◽  
Three Samples ◽  
Aoac Method ◽  
Time Required

Abstract A Youden ruggedness test was performed on the determination of ash in feeds to compare the proposed method of the International Organization for Standardization (ISO) with the official AOAC method. Three samples which contained low, medium, and high ash were analyzed. Six variables were studied : material of the ashing dishes, test portion, preliminary ashing, ashing temperature, ashing time, and additional ashing. Statistical evaluation of the ruggedness test indicated that for Sample A (5.41% average ash), the factors under study did not influence the ash recovery; for Sample B (10.84% average ash), changes in temperature influenced the ash recovery; and for Sample C (13.97% average ash), changes in preliminary ashing, temperature, and additional ashing appeared to influence the ash recovery. It is recommended that the composition of ash be studied further in order to evaluate the temperature and ashing time required to determine nutritionally valuable mineral content.

Vacuum Desiccation Methods for Determination of Free Water in Fertilizers: Interlaboratory Comparison

1980 ◽  
Vol 63 (3) ◽  
pp. 554-555
Author(s):  
Russell D Duncan ◽  
◽  
C H McBride ◽  
E J Hube ◽  
P Kane ◽  
...  
Keyword(s):  
Interlaboratory Comparison ◽  
Free Water ◽  
International Organization ◽  
International Organization For Standardization ◽  
Aoac Method

Abstract A vacuum desiccation method for determining free water in fertilizer, proposed by the International Organization for Standardization (ISO), was compared to the official AOAC vacuum desiccation method (2.013). The combined results of 4 U.S. laboratories showed, on the basis of 5 samples, that precision was better by the ISO method, but results were lower for 4 of the 5 samples. The AOAC method gave a slightly lower result for one sample.

Collaborative Study of Methods for the Determination of Chloride, Citrate, and Phosphate in Processed Cheese

1976 ◽  
Vol 59 (5) ◽  
pp. 1142-1145
Author(s):  
Henry R Brzenk ◽  
O Joseph Krett
Keyword(s):  
Collaborative Study ◽  
Gravimetric Method ◽  
Error Component ◽  
International Organization ◽  
Processed Cheese ◽  
International Organization For Standardization ◽  
Laboratory Error ◽  
Aoac Method ◽  
International Dairy Federation

Abstract A collaborative study was conducted to compare the International Dairy Federation (IDF)/International Organization for Standardization (ISO)/Association of Official Analytical Chemists (AOAC) proposed methods for the determination of chloride and citrate in processed cheese with the corresponding current AOAC methods. Since there is no current AOAC method for phosphate, only the IDF/ISO/AOAC method was used. Five samples of processed cheese were prepared with varying added amounts of the anions of interest. The samples were analyzed in duplicate by 7 collaborating laboratories. For chloride, both methods are comparable, but since the IDF/ISO/AOAC method is simpler and faster it has been adopted as official first action to replace the current AOAC method, 16.224. For citrate, the colorimetric IDF/ISO/AOAC method is more rapid and simpler than the current AOAC gravimetric method. However, the AOAC method is more precise. Therefore, the proposed method has been adopted as official first action as an alternative to 16.237. For phosphate, 2 of the 7 laboratories were outliers by the Youden ranking test but the results by the remaining laboratories appear satisfactory. The phosphate method should receive further study to reduce the between-laboratory error component.

Comparison of Methods for Determining Biuret in Urea

1979 ◽  
Vol 62 (1) ◽  
pp. 153-159
Author(s):  
Luis F Corominas ◽  
Victor M Boy ◽  
Manuel Guijosa
Keyword(s):  
Atomic Absorption ◽  
Spectrophotometric Determination ◽  
Atomic Absorption Spectrophotometry ◽  
International Organization ◽  
Comparison Of Methods ◽  
Definite Advantage ◽  
Absorption Spectrophotometry ◽  
Alternative Procedures ◽  
Aoac Method

Abstract The official first action AOAC method for the spectrophotometric determination of biuret in urea, 2.072—2.074, was compared with official first action AOAC method 2.C01-2.C03 (atomic absorption spectrophotometry), 2 simplified versions of 2.072-2.074, and modified versions of 2 alternative procedures of the International Organization for Standardization. Three synthetic urea samples (0.3, 1.4, and 3.0% biuret) and 1 commercial urea sample (1.0% biuret) were analyzed. The methods proved to be equivalent and none showed a definite advantage over 2.072-2.074. The purification of biuret and the interference by ammonia are also discussed.

scholarly journals Determination of Fumonisins B1 and B2 in Corn by LC/MS with Immunoaffinity Column Cleanup: Interlaboratory Study

2010 ◽  
Vol 93 (2) ◽  
pp. 611-621 ◽  
Author(s):  
Hamide Z Senyuva ◽  
John Gilbert ◽  
Joerg Stroka ◽  
S Biselli ◽  
A De Girolamo ◽  
...  
Keyword(s):  
Fine Powder ◽  
Immunoaffinity Column ◽  
Selected Ion Monitoring ◽  
Test Portion ◽  
Method Performance ◽  
Three Samples ◽  
Interlaboratory Validation ◽  
Cleanup Procedure ◽  
Phosphate Buffered Saline

Abstract An interlaboratory validation study was conducted to establish the method performance characteristics of an immunoaffinity column (IAC) cleanup procedure followed by LC/MS for the determination of fumonisins B1 (FB1) and B2 (FB2) and combined FB1 + FB2 in corn. The test portion is extracted with acetonitrilemethanolwater (25 + 25 + 50). The extract is filtered, diluted with phosphate-buffered saline solution, and applied to an IAC. FB1 and FB2 are removed with methanol, followed by water, then directly determined by RPLC with MS detection using selected-ion monitoring of two characteristic ions in each case. Naturally contaminated corn samples were milled to a fine powder and mixed to produce three samples with target levels of combined FB1 + FB2 ranging from 350 to 4000 g/kg. Of 15 initially participating laboratories, two failed to report results and another did not follow the prescribed method. Thus, valid results were obtained from 12 participants located in 11 countries. Statistical analysis of the results produced RSDr values of 4.611.9, 1.912.6, and 1.411.5 for FB1, FB2, and combined FB1 + FB2, respectively; the corresponding RSDR values were 19.823.8, 18.225.5, and 18.823.2. The three concentration levels of combined FB1 + FB2 were 534, 1194, and 1954 g/kg. HorRat values for r and R were all <2.0, indicating that the method is suitable as a regulatory method for the enforcement of European Union limits for fumonisins in corn.

Collaborative Study on the GLC and AOAC Methods for the Quantitative Determination of Lactic and Succinic Acids in Egg

1970 ◽  
Vol 53 (1) ◽  
pp. 28-35
Author(s):  
Walter F Staruszkiewicz
Keyword(s):  
Lactic Acid ◽  
Standard Deviation ◽  
Succinic Acid ◽  
Collaborative Study ◽  
Good Precision ◽  
Three Samples ◽  
Egg Extracts ◽  
Aoac Method ◽  
Whole Egg

Abstract Nine laboratories collaboratively studied a method for the quantitative GLC determination of lactic and succinic acids in eggs. Four of the laboratories also analyzed samples by the official AOAC method (16.037–16.042). Samples of frozen whole egg, some passable and some decomposed, were analyzed. The organic acids were extracted by the present AOAC procedures, the acids were then esterified with BF2-l-propanol, and the esters were quantitated by GLC. A collaborative report already published on the GLC determination of standard lactic and succinic acids added to egg extracts established that the method gives accurate results over a broad range of acid concentrations. The samples in the present study contained 4–30 mg lactic acid/100 g egg and 0–20 mg succinic acid/100 g egg. Each collaborator analyzed three samples in duplicate and one sample in triplicate. Using the GLC method, the standard deviation was never greater than 0.6 mg for samples containing less than 16 mg lactic acid/100 g egg, while the standard deviation was 0.2 mg for 7 mg or less succinic acid/100 g egg. The results demonstrate that the method gives good precision when it is applied to passable and to decomposed egg and the method is recommended for adoption as official first action.

Liquid Chromatographic Method for Determination of Cyhexatin in Technical and Formulated Products: Collaborative Study

1988 ◽  
Vol 71 (1) ◽  
pp. 26-28
Author(s):  
Stephen Lupan
Keyword(s):  
Statistical Evaluation ◽  
Collaborative Study ◽  
Internal Standard ◽  
Paired Samples ◽  
Coefficients Of Variation ◽  
Liquid Chromatographic Method ◽  
Wettable Powder ◽  
Aoac Method ◽  
Liquid Chromatographic

Abstract Cyhexatin technical (95%), 25 and 50% wettable powders, and a 600 g/L suspension concentrate were analyzed by liquid chromatography in a collaborative study of the method. Paired samples of cyhexatin technical and the 3 formulations were extracted with a mixture of methanol-water-acetic acid (950 + 49 + 1) containing n-decylbenzene as internal standard. Components were separated on a Lichrosorb RP-18 column using methanol-water-HCl-NaCl (93 + 7 + 0.001M + 0.005M) at 2.0 mL/min, and then detected at 214 nm. Results were received from 18 of the 20 laboratories who agreed to participate in the study; 14 sets of data were suitable for statistical evaluation. Repeatability coefficients of variation (CV0 ranged from 0.46% for the 50% wettable powder to 1.14% for the suspension concentrate. Reproducibility coefficients of variation (CVX) ranged from 0.70 to 1.85% for the 4 types of samples. The method has been adopted official first action as a CIPAC-AOAC method.

Comparison of AOAC and ISO Methods for Extraction of Water-Soluble Phosphates in Fertilizers

1989 ◽  
Vol 72 (5) ◽  
pp. 860-862
Author(s):  
James A Farley
Keyword(s):  
Water Soluble ◽  
International Organization ◽  
Phosphate Fertilizers ◽  
International Organization For Standardization ◽  
Wide Range ◽  
Aoac Method

Abstract A wide range of phosphate fertilizers were analyzed for watersoluble phosphorus to compare 2 recognized methods: AOAC method 2.040 and the International Organization for Standardization (ISO) method No. 5316. In general, the ISO method extracted more phosphorus from triple and normal superphosphates; the AOAC method extracted more phosphorus from diammonium, monoammonium, and nitric phosphates. Both methods exhibited similar precision. The results indicate that care must be exercised when data for watersoluble phosphate are reported.

Flour Acidity Comparisons as Related to Fat Acidity Methods of the Association of Official Analytical Chemists and the International Organization for Standardization

1990 ◽  
Vol 73 (4) ◽  
pp. 626-627
Author(s):  
Gregory D Parker ◽  
Ralph H Lane
Keyword(s):  
Petroleum Ether ◽  
Petroleum Ether Extract ◽  
Collaborative Study ◽  
International Organization ◽  
Official Method ◽  
Whole Wheat Flour ◽  
International Organization For Standardization ◽  
Whole Wheat ◽  
Aoac Method ◽  
Flour Sample

Abstract Acidity data were compared of selected flour samples obtained by methods of the International Organization for Standardization (ISO) and the Association of Official Analytical Chemists (AOAC) with and without toluene as a part of the titration medium. In all cases, the ISO method produced significantly higher fat acidity values (P < 0.001) than the AOAC method, probably as a result of greater extraction of acidic materials with the more polar solvent, 95% alcohol, than with petroleum ether. Except for a whole wheat flour sample, no differences (P > 0.05) existed between fat acidity values produced by AOAC methodology consisting of titration of the evaporated petroleum ether extract of the flour in a medium of equal volumes of 95% alcohol and toluene as prescribed In the official method (14.069-14.071), or In a medium of 95% alcohol alone. Based on the data and the potential toxicity of toluene, a collaborative study Is recommended to determine the Influence of Its removal from the official AOAC method. Fat

SOLUÇÃO DE PROBLEMAS NA ASSOCIAÇÃO COMERCIAL E INDUSTRIAL DE ANÁPOLIS COM O USO DA NBR ISO: 9001

2018 ◽  
Vol 4 (3) ◽  
pp. 19-42
Author(s):  
Keliany Marçal Silva ◽  
Juliana Luíza Moreira Del Fiaco
Keyword(s):  
International Organization ◽  
Iso 9001 ◽  
International Organization For Standardization

A implantação das normas aplicadas pela ISO (International Organization for Standardization) pode ser benéfica ou não para as organizações, dependendo da forma como são aplicadas. Este artigo fruto de pesquisa analisou se a Associação Comercial e Industrial de Anápolis (ACIA) aplicou bem o Sistema de Gestão da Qualidade (SGQ) e assim teve como objetivo geral identificar possíveis prós e contras da implantação da ISO no trabalho cotidiano dos seus colaboradores internos, e por, objetivos específicos: relatar como os colaboradores da ACIA entendem e utilizam a ISO; caracterizar as melhorias no trabalho interno dos colaboradores pós implantação do SGQ e avaliar as melhorias que o SGQ provocou na instituição. Para atingir tais metas, realizou-se uma pesquisa descritiva, explicativa e bibliográfica, sendo necessário entrevistar os colaboradores por meio de aplicação de questionários para 22 sujeitos da pesquisa, que revelaram conforme os resultados apresentados a seguir, que estes não veem a participação necessária da gestão nos quesitos relacionados à NBR ISO:9001 que está implantada na empresa e precisa de manutenção constante, porém, acreditam que quando bem controlado, o sistema pode gerar economicidade, organização e padronização, sendo benéfico para o trabalho rotineiro.

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