SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 29:192-194 (1965)
© 1965 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Development of the Tetraphenylboron Method for the Determination of Extractable Soil Potassium1

Allison C. Bennett and Robert M. Reed2

ABSTRACT

Many county and small commercial laboratories make quick tests on soil samples. These laboratories need a simple precise analytical procedure for extractable soil potassium. A turbidimetric method, using sodium tetraphenylboron, proposed by Sunderman and Sunderman was modified and further developed. Six Oklahoma soils were collected for this investigation. Sodium acetate and sodium nitrate at three concentrations (0.1, 0.5, and 3.0N) were used as extractants. Three extractant-soil ratios (5:1, 7:1 and 10:1) were also employed. The most suitable extractant was 0.1N sodium nitrate at an extractant-soil ratio of 5:1. Injection of sodium tetraphenylboron with a hypodermic syringe was the most satisfactory method. For maximum flocculation, there was a time-temperature interaction. Ammonium ion concentrations of 3 ppm or less were complexed by formaldehyde. Calcium and magnesium interferences were alleviated by EDTA.

NOTES

1 Journal Paper No. 1011. Contribution from the Agronomy Department, Oklahoma State Univ., Stillwater, Okla. Published with the approval of the Director of the Oklahoma Agr. Exp. Sta. Presented before Div. S-4, Soil Science Society of America, Nov. 18, 1963 at Denver, Colo.

2 Formerly Teaching Assistant, and Professor, Oklahoma State University, respectively.

Received for publication March 2, 1964. Accepted for publication January 7, 1965.






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