RARE-EARTH-ELEMENTS; COLLOIDS; LIQUIDS

In this paper, we report the use of laser induced breakdown spectroscopy (LIBS) to detect dissolved Eu and Yb in bulk aqueous solutions. Ten strong emission lines of Eu and one strong emission line of Yb were identified in the underwater LIBS spectra obtained by using Czerny-Turner spectrometer within the wavelength range of 375-515 nm, Temporal evolution of plasma and the effect of laser pulse energy on the spectral emission were studied. Calibration curves using the concentration range from 500 to 10,000 ppm were developed and limits of detection for Eu and Yb were estimated to be 209 and 156 ppm, respectively. (C) 2017 Elsevier B.V. All rights reserved.

Laser induced breakdown spectroscopy; Liquid jet; Mixture solution; Limit of detection;

In this paper, the concentrations of Cu, Mg, Zn and Cd elements in the mixture solution consing of CuSO4, Mg(NO3)(2), Zn(NO3)(2) and Cd(NO3)(2) were measured with Laser Induced Breakdown Spectroscopy with aqueous jets which were generated within 1 064 nm wavelength of Nd: YAG laser with pulse width of 10ns and repetitive rate of 10 Hz. The mixture solutions of seven different concentrations consist of Cu, Mg, Zn and Cd were compound by adding the four solutes to the distilled water. The LIBS experiment date have been treated with the statistical exploratory data analysis method to abtain calibration curves of Cu, Mg, Zn and Cd elements, whose linear fitting coefficient R-2 were all above 0. 99, the LOD of Cu, Mg, Zn and Cd elements were determined as 5. 62, 4. 71, 13. 67 and 4. 43 ppm, respectively. The LOD of Cu element was 3. 98 ppm for pure CuSO4 solution with better experimental results than that of mixed solution, Finally, the LIBS detected differences were analyzed. The research results show that LIBS has a promising application in detecting heavy metal elements in the environmental wastewater pollution.

LIBS; Solution; Zirconium; Fukushima Dai-chi decommissioning; Ultra-thin liquid jet;WATER-BASED LIQUIDS; QUANTITATIVE-ANALYSIS; METALLIC TRACES; SPECTROMETRY; SINGLE; CHROMIUM; PLASMA; SPECIATION; SODIUM; DEBRIS

In the context of the Fukushima Dai-ichi Nuclear Power Plant (F1-NPP) decommissioning process, laser-induced breakdown spectroscopy (LIBS) has many advantages. The purpose of the present work is to demonstrate the on-line monitoring capability of the LIBS coupled with the ultra-thin liquid jet sampling method. The study focuses on zirconium in aqueous solution, considering that it is a major element in the F1-NPP fuel debris that has been subject to only a few LIBS studies in the past. The methodology of data acquisition and processing are described. In particular, two regions of interest with many high intensity zirconium lines have been observed around 350 nm in the case of the ionic lines and 478 nm in the case of atomic lines. The best analytical conditions for zirconium are different depending on the analysis of ionic lines or atomic lines. A low LOD of about 4 mg L-1 could be obtained, showing that LIBS coupled with the ultra-thin liquid jet sampling technique is a promising alternative for more complex solutions found in the F1-NPP, namely mixtures containing zirconium. (C) 2017 Elsevier B.V. All rights reserved.

Femtosecond; Laser repetition rate; Limit of detection;INDUCED BREAKDOWN SPECTROSCOPY; NANOSECOND

Experimentally investigated limit of detection Mg, Al, Sr, Pb. depending on the pulse repetition rate femtosecond Ti: Sa laser optical breakdown in aqueous solutions on the surface of the investigated element in the laser pulse duration 60 fs, pulse energy of 1 mJ. The study was conducted for the laser pulse repetition rate of 50 Hz, 150 Hz, 250 Hz. To choose the optimal time delay of registration relative to the laser beam for the following chemicals:: Na, N, Fe, Ca, Mg, Al, Pb, Mn.