Determination of boron in nickel-base alloys by the dianthrimide method.
The dianthrimide method for the determination of boron in iron and low-alloy steels may be applied to nickel-base materials. The sample is dissolved, without any loss of boron, by hydrochloric and sulphuric acids and the resulting boric acid determined spectrophotometrically with dianthrimide. Background corrections are necessary to compensate for the absorbance from ions such as nickel and iron.
Synthesis and Physico-Chemical Properties of Zirconium Phosphoborate and its Application in The Quantitative Separation of Lanthanides
Abstract A new inorganic ion exchanger, zirconium phosphoborate (Zr:P:B = 1:1:1), has been synthesized by mixing a 0.1M zirconium oxychloride solution with a hot mixture of 0.1M boric acid and 0.1M phosphoric acid solutions in the ratio 2:1:1. The pH of the mixture was adjusted to zero. This procedure gave a reproducible ion exchanger. It is fairly stable in water, dilute solutions of acids, base, salt solutions and non-aqueous solvents such as methanol, DMSO and DMF. A tentative structure of this compound is proposed on the basis of chemical analysis, pH titrations, TGA and IR studies. Ion 'distribution studies of 22 metal ions have been made on this exchanger and on the basis of these studies four binary separations of lanthanide ions (Sm3+ - Er3+, Pr3+ - Er3+, Th4+ - Er3+ and Y3+ - Er3+) have been achieved on these columns.
A modified procedure for determining boron in plant material and soils using 1:1'-dianthrimide.
The I : I′-dianthrimide reagent was tested for determining boron in some plants and soils. A convenient modification of the method of Ellis, Zook & Bandish (1949) is described, permitting the determination of 3 μg. of boron with a standard error of ± 0.48%, using the Biochem absorptiometer.