+ Translate

Evaluation of agreement among routine methods for determination of fluoride in vegetation inter laboratory collaborative study

, : Evaluation of agreement among routine methods for determination of fluoride in vegetation inter laboratory collaborative study. Journal of the Association of Official Analytical Chemists 65(5): 1150-1154

An interlaboratory collaborative study was conducted to evaluate the performance of methods and laboratories for the measurement of fluoride in vegetation. Samples of 8 plant species [citrus leaves, loblolly pine needles, balsam fir needles, cherry leaves, milo maize leaves, pasture grass, eucalyptus leaves, hay] containing about 5-200 ppm fluoride were distributed to 40 participants who were instructed to use their routine methods of analysis. Methods which had sufficient participants to allow the inclusion of results in statistical analyses were classified into 3 categories: Willard-Winter method (similar to the AOAC [Association of Official Analytical Chemists] official final action method); semiautomated and potentiometric methods (similar to the 2 AOAC official first action methods); and potentiometric analysis with prior ashing, fusion, and/or distillation (not an approved method). There was a significant interaction of methods with samples caused by 3 of the 8 samples. In the other 5 samples, the Willard-Winter and semiautomated methods gave higher mean values for fluoride content than did the 2 potentiometric methods. Despite considerable improvement in speed and simplicity of fluoride analyses during the last decade, agreement between laboratories has not improved because of the variety of methods and techniques in use, the inherent differences between methods, and, apparently, poor laboratory quality control.

(PDF 0-2 workdays service)

Order PDF Full Text


Click here to order any other PDF Full Text

Accession: 005395993

PDF Full Text: Submit

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Other references

Bell, P., 1977: Return of the rabbit. Country life: 162 (4192) 1319-1320

Nicolson, G. L.; Poste, G., 1978: Mechanism of resistance to ricin toxin in selected mouse lymphoma cell lines. The role of impaired toxin uptake in conferring cellular resistance to the plant toxin RCAII (ricin) was examined using a murine BW5147 lymphoma line and a toxin-resistant variant (BW5147RicR.3) selected by repeated exposure to RCAII. The toxin-re...

Kysela, Boris, P.; Lohrer, Horst; Arrand, Janet, E., 1995: Defects in the kinetics of the repair of DNA double-strand breaks and inhibition of DNA synthesis in the ataxia telangiectasia AT5BI-VA cell line: Comparison to a corrected hybrid, atxbc. The nature of the primary biochemical defect in the human radiosensitive and cancer-prone syndrome, ataxia telangiectasia (AT), has remained obscure despite many efforts to elucidate it. In this study, AT complementation group D cells and a nearly...

Ueki, Nobuhide; Oda, Tamaki; Kondo, Maiko; Yano, Kazuhiro; Noguchi, Teruhisa; Muramatsu, Masa Aki, 1998: Selection system for genes encoding nuclear-targeted proteins. Nuclear proteins have essential roles in cell proliferation and differentiation. We have developed a yeast selection system-the nuclear transporation trap (NTT)-to identify genes encoding nuclear transport signals. Both unknown and previously iden...

Doronina, O. D.; Geiko, N. S.; Nechaev, A. P., 1978: Changes in structure of triglycerides during the process of maize grain maturation. Data on changes in the structure of total triglycerides in the ripening grains of maize cv. Moskovskya-5 during different yr are given. The growing conditions affect the accumulation of oleic and linoleic acids in mol. of triglycerides during the...

Enright, P.; Madramootoo, C. A., 1994: Hydrologic response of surface and subsurface drained agricultural fields. A three year field study was conducted in south central Quebec to characterize the hydrologic response from small agricultural fields with different surface drainage systems. Three sites were instrumented to measure rainfall, surface runoff, and s...

Nesterov, PV., 1912: Contributions a la faune herpetologique de la Transcaucasic S-O et de la partie ad jacente de lAsie Mineure. Annales du Musee Zoologique Academie des Sciences St Peterburg, 17 61-85

Gao, Jun; Ghibaudi, Lorraine; Van Heek, Margaret; Hwa, Joyce J., 2002: Characterization of diet-induced obese rats that develop persistent obesity after 6 months of high-fat followed by 1 month of low-fat diet. A subset of Sprague-Dawley rats developed persistent obesity when maintained on a high-fat diet for 6 months followed by a low-fat diet for 1 month, while another subset from the same cohort of rats remained lean on the same diet regimens. The die...

Canavese C.; Catturich A.; Vecchio C.; Estienne M.; Scala M.; Dini D., 1990: Post operative lymphedema of the arm in breast cancer surgery. Breast Cancer Research & Treatment 16(2): 155

Kraichev S.D., 1973: Idiopathic rupture of the diaphragm. Vestnik Rentgenologii i Radiologii 48(1): 66-69