The determination of boron in organic compounds has been a difficult and unrewarding task until recent times. As a result investigators, for the most part, have relied on other elemental determinations, such as C, H, N and halogen, for the information needed for the proof of structure arguments necessary for the validation of new compounds. During the past few years technological developments in the management of the direct-current argon plasma (DCP) have led to a sensitive, convenient, and reliable means of determining boron as well as certain other elements whose analytical chemistry has been fraught with difficulties. As a consequence of the progress in this area of applied spectroscopy, we have been able to develop a highly satisfactory analytical method, based on DCP, for the determination of boron in tetraarylborate salts. This method should be applicable to other organo-boron systems in which the analyte is soluble in an appropriate organic solvent system.
Agnes Yoo, Carl E. Moore, Rupert Jones, and Aaron Synsteby, "Determination of Elemental Boron in Tetraarylborates by DC Argon Plasma Emission Spectrometry," Appl. Spectrosc. 40, 1073-1074 (1986)