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métodos de anälise fisica, quimica e instrumental de solos

métodos de anälise fisica, quimica e instrumental de solos

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18. VETTORI, L. — Métodos <strong>de</strong> Anólises <strong>de</strong> Solos. DPFS e PRO-AG 249<br />

— 1966 — (mimeog.)<br />

19. VISCONTI, Y. S. — Argilas e Minerais Af ins. Institute Nacional <strong>de</strong><br />

Tecnologia. 1951.<br />

20. WELCHER, I. J. — Organic Analytical Reagentes. D. Van Nostrand<br />

Co. 1947.<br />

21. WELLS, C. G. & COREY, R. B. — Elimination of interference by<br />

phosphorous and other elements in the flame photometric<br />

<strong>de</strong>terminations of calcium and magnesium in plant tissue. Soil<br />

Sei. Soc. Am. Proc — 24: 189-190 — 1960.<br />

22. WEST, A. C. & COOKE, W. D. — Elimination of anion interferences<br />

in flame spectroscopy: Use of (ethylenedinitrilo) Tetraaacetic<br />

acid. Anal. Chem. 32 : 1471-1474. 1960.<br />

— 94 —

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