Boron analysis

Two colorimetric methods are recommended for boron analysis. One is the curcumin method, where the sample is acidified and evaporated after addition of curcumin reagent. A red product called rosocyanine remains it is dissolved in 95 wt % ethanol and measured photometrically. Nitrate concentrations >20 mg/L interfere with this method. Another colorimetric method is based upon the reaction between boron and carminic acid in concentrated sulfuric acid to form a bluish-red or blue product. Boron concentrations can also be deterrnined by atomic absorption spectroscopy with a nitrous oxide—acetjiene flame or graphite furnace. Atomic emission with an argon plasma source can also be used for boron measurement. 

Boron-aluminum-magnesium alloys, 4 137 Boron analysis, of water, 26 39 Boronate affinity chromatography, 6 403 04... 

Table II. Boron Analysis of Sections of PBSG Films...

Silyl-8 Column Conditioner Azomethine H Reagent for boron analysis AquaSiT" Siliconizing fluid SurfaSil Siliconizing fluid... 

Pennington HD, Pinch CR, Lyons CC and Littau SA (1991) Microwave digestion of plant samples for boron analysis. Hortsci 26 1496-1497. 

The solutions that were prepared by reaction of the cherts with HF, HNO3 for boron analysis (see later) were also analyzed for other elements (Table 2). Aluminium (as reflecting clay) concentration averaged 0.5% and did not exceed 1% the total of non-Si and Al cations did not exceed 0.5% in all but one case (1%), and averaged 0.4%. Most importantly B content is not correlative with the concentration of any of the measured elements. 

Boron analysis via detection of the prompt y-ray from the °B (n, a) Li reaction was shown to be a reliable technique (Fairchild et al. 1986). This method makes it possible to measure the boron content in small amounts (mg samples) of antibodies or boron uptake in cells grown in tissue culture. In order to determine °B concentrations in a tumor in vivo without injuring tissues, phantom prompt... 

Fairchild, R. G., D. Gabel, and B. H. Laster. 1986. Microanalytical techniques for boron analysis using the °B... 

Matsumoto, T., M. Aoki, and O. Aizawa. 1991. Phantom experiment and calculation for in vivo boron-analysis by prompt gamma ray spectroscopy. Phys. Med. Biol. 36 329-338. 

Probst, T. U. 1999. Methods for boron analysis in boron neutron capture therapy (BNCT). A review. J. Anal. Chem. 364 391 03. 

Light element analysis by XRF is applied in very different scientific and industrial fields. Boron analysis with modern x-ray spectrometers is very important in the semiconductor, ceramic and glass industries or in geosciences. Determination of beryllium in bronze could be an interesting application for XRF analysis in the future. Modern wavelength-dispersive x-ray spectrometers achieve the analytical capability to analyze beryllium in bronze with a limit of detection (= LLD) lower than 0.1%, boron in glass with a LLD of 0.04% and carbon in steel or cement below 100 ppm. 

Huang SF, Terakura K, Ozaki T, Ikeda T, Boero M, Oshima M, Ozaki JI, Miyata S (2009) First-principles calculations of the electronic properties of graphene clusters doped with nitrogen and boron analysis of catal5dic activity for the oxygen reduction reaction. Phys Rev B 80 235410-1-235410-4... 

Syndiesis of Cyclopentatrienyl Derivatives of Boron. Analysis of the Eqnilibriunt Cycloheptatriene-Norcaradiene... 

Using an energy dispersive system only Si as framework constituent has been detected. Boron analysis yielded about 1% B in the as synthesized sample, whereas after calcination only traces were detected. 

If boron analysis is required, use AES, but do not use Ar+ for sputtering (there will be spectral interferences with the B 179-cV peak), instead use Xe+. 

Boron analysis by measuring the methyleneblue-BF]j complex after extraction with 1.2-dichlorethane is proposed by Meier et al. (20) as a very sensitive and reliable method for boron determinations in aluminium. 1 g of aluminium is dissolved in sodium hydroxide in a quartz beaker under heating and addition of some sodium peroxide. The solution is cooled, acidified with sulphuric acid and warmed up again until it clarifies. After cooling, the solution is transferred into a 250 ml calibrated quartz flask and diluted to the mark with water. 25 ml of this solution are then mixed with 5 ml hydrofluoric acid (5 %) and 10 ml 0.001 M methyleneblue solution in a plastic beaker and allowed to stand for 1 hour. The pH-value should be 2 + 0.2. The solution is then shaken with 25 ml 1.2-dichlorethane during 1 min. The complete separation of the phases needs 30 min. To eliminate interferences (especially from coextracted methyleneblue fluorohydrate), the extract is washed with 10 ml sodium nitrate solution (3 %), filtered... 

Table IV-9 Results of boron analysis in pure zirconium and zircaloy...

---