Extraction of tetrafluoroborate with crown ethers and its application to silicate rock analysis |
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| Authors: | Hideko Koshima and Hiroshi Onishi |
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| Institution: | (1) Department of Chemistry, University of Tsukuba, Tsukuba-shi, 305 Ibaraki-ken, Japan;(2) Present address: Department of Materials Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, 52021 Otsu-shi, Japan |
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| Abstract: | Summary The extraction behaviour of tetrafluoroborate with crown ethers was studied. A high distribution ratio of tetrafluoroborate is obtained by extraction with dicyclohexano-18-crown-6 (DC18C6) in an organic solvent of high dielectric constant from potassium fluoride solution. The molar ratios of crown ether to KBF4 in the extracted species are probably 1:1 for DC18C6, dibenzo-18-crown-6 and 18-crown-6, and 2:1 for benzo-15-crown-5 and 15-crown-5. The flow-injection extraction-spectrophotometric determination of tetrafluoroborate with Brilliant Green was worked out. Many rock reference samples were analyzed for boron (1–150 ppm). |
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