Abstract
Boron element is widely distributed in different geologic bodies, and there are important geo-chemical applications in earth science. Halite is a common mineral found in sediment basin. However there is no good method to accurately measure the boron content in halite, which is mainly because Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) and Inductively Coupled Plasma Mass Spectrometer (ICP-MS) are limited by the high salt matrix interference and the instrument detection limit. Thus enriching the boron element and removing the matrix interference are necessary before the measuring. In this paper, Amberlite IRA 743 boron-specific resin was applied to enrich the boron element and remove most of the high-salt matrix. The strong acid cation resin (Dowex 50 W×8, 200-400 mesh, USA) and weak-base anion resin (Ion Exchanger II, Germany) were mixed with equal volume, which could remove the foreign ions completely: meanwhile, the relative content of boron in the solution reached above 98%, and the recoveries ranged from 97.8% to 104%. 208.900 nm was chosen as the detection wavelength for ICP-OES, and the detection identification and quantification limits were 0.006 mg·L−1 and 0.02 mg·L−1, respectively. 11B was chosen as the measuring element for ICP-MS, and the detection identification and quantification limits were severally 0.036 mg·L−1 and 0.12 mg·L−1. The relative standard deviations ranged from 1.4% to 3.4% through six replicates under different salinities. Therefore, the process could be regarded as a feasible method to measure boron content in halite by ICP-OES and ICP-MS.
Highlights
The boron is a strongly incompatible element in the earth [1], which makes the boron remain in the solution during the evaporation, and, with the development of evaporation, the boron content in the halite increases [2, 3]
Spectrophotometry is a common method for the determination of boron content in many minerals, such as biological sample, soil, plants, and food [6,7,8,9,10,11]; it was the only method to measure the boron content in boron-rich halite formed in laboratory [4]
The results demonstrated that the high salt matrix interference of the solution could be excluded effectively, which is suitable for the detection of the boron content by Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) and Inductively Coupled Plasma Mass Spectrometer (ICP-MS) after removing the high-salt matrix and enriching the boron element
Summary
The boron is a strongly incompatible element in the earth [1], which makes the boron remain in the solution during the evaporation, and, with the development of evaporation, the boron content in the halite increases [2, 3]. There were few reports about measuring the boron content in halite. Due to the low sensitivity and serious matrix interference, it is not good for measuring the boron content in natural halite. There was no report about using ICP-MS and ICP-OES to measure the boron content in halite. Preenrichment of boron element and reducing the salinity from solution are the keys to successfully measure the boron content in halite by ICP-OES or ICP-MS. The strong acid cation resin (Dowex 50 W×8, 200-400 mesh, USA) and weak-base anion resin (Ion Exchanger II, Germany) were mixed with equal volume to remove NaCl and HCl. send the solution to measure boron content by ICP-OES and ICP-MS
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