Microcolorimetric Method for Determining Boron in Fertiliz

Abstract

A modification and evaluation of an unpublished azomethine H colorimetric method for determining boron in fertilizer are described By changing formulations of the color reagent and buffer-masking solution, interferences were eliminated and color development reached a maximum in 1 hr and remained stable for an additional hour. The method was simplified by combining the color reagent and buffer-masking solution; matrix and acid effects were controlled by adjusting sample and acid background in the solution, thus eliminating the need for standard addition techniques. Samples with boron contents from 0.03 to 3.0% were analyzed with the proposed method; the expected values were obtained with coefficients of variation of 3.19 and 1.27%, respectively, for the low and high levels of boron.

Fertilizers

“…Boron. Thorpe (207) described specific modifications of the azomethine H colorimetric reaction for B in fertilizers. By changing the formulations of the color reagent and the buffer-masking solutions, interferences were eliminated.…”