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Published in Soil Sci Soc Am J 30:443-446 (1966)
© 1966 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Determination of Mg with 1-azo-2-hydroxy-3-(2,4-dimethylcarboxanilido)-naphthalene-1'-(2-hydroxybenzene)1

D. E. Peaslee2

ABSTRACT

The reagent 1-azo-2-hydroxy-3-(2,4-dimethylcarboxanilido)-naphthalene-1'-(2-hydroxybenzene forms a soluble red complex with Mg and tolerates high concentrations of Ca. These properties suggested its usefulness as a reagent for determining Mg in soil extracts. Successful masking of interferences due to Al, Fe, Mn, and Cu permitted its use in precise spectrophotometric and rapid colorimetric determination of Mg.

The spectrophotometric method will determine 1–10 µg of Mg and tolerates the following µg quantities of diverse ions: Ca+, 1,000; Al4+3 100; Mn2+, 150; Fe3+, 150; Zn2+, 65; Cu2+, 10; 10 µg P as PO43- plus 300 µg N as NH4+. Analyses of soil extracts had a coefficient of variation of 1.5%. The colorimetric procedure is designed for soil extracts containing 5–85 µg Mg/ml and tolerates the following concentrations of diverse ions expressed as µg/ml in the extract: Ca2+, 1,000; Al3+, 150; Mn2+, 60; Fe3+, 15; Fe2+, 15; Zn2+, 65; Cu2+, 15. These methods have the advantages of sensitivity, stability, and freedom from interferences compared to most "lake" and titration methods. A semiquantitative spot test is also described.

NOTES

1 Contribution from The Connecticut Agr. Exp. Sta., New Haven. Presented before Div. S-2, Soil Science Society of America, Nov. 4, 1965, at Columbus, Ohio.

2 Associate Soil Scientist.

Received for publication August 18, 1965. Accepted for publication May 19, 1966.






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