Use of multiple lines for improving accuracy, minimizing systematic errors from spectral interferences, and reducing matrix effects in MIP OES measurements

2018 ◽  
Vol 143 ◽  
pp. 326-330 ◽  
Author(s):  
Aline F. Oliveira ◽  
Mario Henrique Gonzalez ◽  
Ana Rita A. Nogueira
Keyword(s):  
Matrix Effects ◽  
Systematic Errors ◽  
Spectral Interferences ◽  
Improving Accuracy ◽  
Mip Oes

A practical approach to non-spectral interferences elimination in inductively coupled plasma optical emission spectrometry

2016 ◽  
Vol 70 (6) ◽  
Author(s):  
Anna Krejčová ◽  
Tomáš Černohorský ◽  
Lenka Bendakovská
Keyword(s):  
Inductively Coupled Plasma ◽  
Matrix Effects ◽  
Optical Emission ◽  
Optical Emission Spectrometry ◽  
Emission Spectrometry ◽  
Spectral Interferences ◽  
Inductively Coupled ◽  
The Matrix ◽  
Plasma Optical Emission Spectrometry ◽  
Matrix Concentration

AbstractMatrix effects and practical possibilities of reducing accompanying non-spectral interferences in inductively coupled plasma optical emission spectrometry (ICP-OES) were studied for microconcentric Micromist, concentric and V-groove nebulizers (VGN) coupled with two cyclonic spray chambers of different sizes. The effect of a wide scale of interferents and mixtures thereof in the concentration range of up to 2 mass % (Na, Ca, Ba, La, urea) or up to 20 vol. % (nitric acid) on the analysis of Cd, Cu, K, Mg, Mn, Pb and Zn was investigated in terms of their analytical recovery and Mg(II) 280.27 nm/Mg(I) 285.29 nm line intensity ratio. Recoveries of ionic lines were lower than those of atomic lines (37–102 %) depending on the matrix concentration. The Mg(II)/Mg(I) ratios were found to be 12–15 and they slightly decreased as the matrix load increased. Exceptional behavior of pure La matrix, steeply lowering the recoveries and Mg(II)/Mg(I) ratios was observed. A Micromist nebulizer coupled with a small inner volume spray chamber provided the highest recoveries (94–102 %), lowest matrix effects across the matrix loads and, compared to others, the least significant dependence without worsening of the analytical characteristics (recoveries, signal background ratios and the Mg(II)/Mg(I) ratios) across the studied matrices.

scholarly journals N<sub>2</sub>O isotopocule measurements using laser spectroscopy: analyzer characterization and intercomparison

2020 ◽  
Vol 13 (5) ◽  
pp. 2797-2831 ◽  
Author(s):  
Stephen J. Harris ◽  
Jesper Liisberg ◽  
Longlong Xia ◽  
Jing Wei ◽  
Kerstin Zeyer ◽  
...  
Keyword(s):  
Mole Fraction ◽  
Matrix Effects ◽  
Matrix Composition ◽  
Trace Gas ◽  
N2o Production ◽  
Spectral Interferences ◽  
Isotopic Species ◽  
Accuracy And Repeatability ◽  
Detection Schemes ◽  
Specific Correction

Abstract. For the past two decades, the measurement of nitrous oxide (N2O) isotopocules – isotopically substituted molecules 14N15N16O, 15N14N16O and 14N14N18O of the main isotopic species 14N14N16O – has been a promising technique for understanding N2O production and consumption pathways. The coupling of non-cryogenic and tuneable light sources with different detection schemes, such as direct absorption quantum cascade laser absorption spectroscopy (QCLAS), cavity ring-down spectroscopy (CRDS) and off-axis integrated cavity output spectroscopy (OA-ICOS), has enabled the production of commercially available and field-deployable N2O isotopic analyzers. In contrast to traditional isotope-ratio mass spectrometry (IRMS), these instruments are inherently selective for position-specific 15N substitution and provide real-time data, with minimal or no sample pretreatment, which is highly attractive for process studies. Here, we compared the performance of N2O isotope laser spectrometers with the three most common detection schemes: OA-ICOS (N2OIA-30e-EP, ABB – Los Gatos Research Inc.), CRDS (G5131-i, Picarro Inc.) and QCLAS (dual QCLAS and preconcentration, trace gas extractor (TREX)-mini QCLAS, Aerodyne Research Inc.). For each instrument, the precision, drift and repeatability of N2O mole fraction [N2O] and isotope data were tested. The analyzers were then characterized for their dependence on [N2O], gas matrix composition (O2, Ar) and spectral interferences caused by H2O, CO2, CH4 and CO to develop analyzer-specific correction functions. Subsequently, a simulated two-end-member mixing experiment was used to compare the accuracy and repeatability of corrected and calibrated isotope measurements that could be acquired using the different laser spectrometers. Our results show that N2O isotope laser spectrometer performance is governed by an interplay between instrumental precision, drift, matrix effects and spectral interferences. To retrieve compatible and accurate results, it is necessary to include appropriate reference materials following the identical treatment (IT) principle during every measurement. Remaining differences between sample and reference gas compositions have to be corrected by applying analyzer-specific correction algorithms. These matrix and trace gas correction equations vary considerably according to N2O mole fraction, complicating the procedure further. Thus, researchers should strive to minimize differences in composition between sample and reference gases. In closing, we provide a calibration workflow to guide researchers in the operation of N2O isotope laser spectrometers in order to acquire accurate N2O isotope analyses. We anticipate that this workflow will assist in applications where matrix and trace gas compositions vary considerably (e.g., laboratory incubations, N2O liberated from wastewater or groundwater), as well as extend to future analyzer models and instruments focusing on isotopic species of other molecules.

Matrix effects in atmospheric pressure nitrogen microwave induced plasma optical emission spectrometry

2020 ◽  
Vol 35 (7) ◽  
pp. 1389-1394 ◽  
Author(s):  
Oleg V. Pelipasov ◽  
Evgeniya V. Polyakova
Keyword(s):  
Flow Rate ◽  
Atmospheric Pressure ◽  
Matrix Effects ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Plasma Power ◽  
Microwave Induced Plasma ◽  
The Matrix ◽  
Plasma Optical Emission Spectrometry ◽  
Mip Oes

The matrix effects in MIP OES arising in the presence of elements with Eion 5.13–9.39 eV (Na, Cu, Pb, Cd, Zn) depending on the concentration, nebulization flow rate, and plasma power were studied.

Study of matrix effects and spectral interferences in the determination of lead in sediments, sludges and soils by SR-ETAAS using slurry sampling

Talanta ◽  
2010 ◽  
Vol 82 (2) ◽  
pp. 523-527 ◽  
Author(s):  
Marianela Savio ◽  
Soledad Cerutti ◽  
Luis D. Martinez ◽  
Patricia Smichowski ◽  
Raúl A. Gil
Keyword(s):  
Matrix Effects ◽  
Slurry Sampling ◽  
Spectral Interferences

scholarly journals Evaluation of MIP-OES as a detector in DLLME procedures: application to Cd determination in water samples

2020 ◽  
Vol 35 (7) ◽  
pp. 1351-1359 ◽  
Author(s):  
Raquel Serrano ◽  
Guillermo Grindlay ◽  
Przemysław Niedzielski ◽  
Luis Gras ◽  
Juan Mora
Keyword(s):  
Elemental Analysis ◽  
Water Samples ◽  
Spectral Interferences ◽  
Emission Signal ◽  
Organic Extractants ◽  
Mip Oes

This work evaluates the feasibility of coupling DLLME to MIP-OES for elemental analysis. To this end, the potential spectral and non-spectral interferences caused by different organic extractants on the emission signal in MIP-OES have been studied.

Improved Calibration for Inductively Coupled Plasma-Atomic Emission Spectrometry Using Generalized Regression Neural Networks

1995 ◽  
Vol 49 (6) ◽  
pp. 798-807 ◽  
Author(s):  
Miguel Catasus ◽  
Wayne Branagh ◽  
Eric D. Salin
Keyword(s):  
Neural Networks ◽  
Inductively Coupled Plasma ◽  
Matrix Effects ◽  
Conventional Technique ◽  
Emission Spectrometry ◽  
Average Error ◽  
Plasma Atomic Emission Spectrometry ◽  
Spectral Interferences ◽  
Generalized Regression Neural Networks ◽  
Generalized Regression

Artificial neural networks have been recently used in different fields of science in applications ranging from pattern recognition to semi-quantitative analysis. In this work, two types of neural networks were applied to the problems of spectral interferences, matrix effects, and the measurement drift in ICP-AES. Their performance was compared to that of the more conventional technique of multiple linear regressions (MLR). The two types of neural networks examined were “traditional” multilayer perceptron neural networks and generalized regression neural networks (GRNNs). The GRNN is comparable to, or better than, MLR for modeling spectral interferences and matrix effects covering several orders of magnitude. In the case of an Fe spectral interference on Zn, the GRNN reduced the error from 81% to 24%, while MLR reduced the average error to only 49%. For matrix effects caused by large backgrounds of Mg (0–10,000 ppm) on Zn, average error was reduced to 55% from 67%. In the case of combinations of spectral overlaps and matrix effects, the GRNN reduced average error by approximately 10%. MLR performed poorly on systems involving matrix effects. GRNN is also a very promising tool for the correction of drift caused by fluctuations in power levels, reducing drift over a two-hour period from 2.3% to 0.6%. GRNNs, both by themselves and in multinetwork combinations, seem to be highly promising for the correction of nonlinear matrix effects and long-term signal drift in ICP-AES.

Evaluation of calcium-, carbon- and sulfur-based non-spectral interferences in high-power MIP-OES: comparison with ICP-OES

2019 ◽  
Vol 34 (8) ◽  
pp. 1611-1617 ◽  
Author(s):  
Raquel Serrano ◽  
Guillermo Grindlay ◽  
Luis Gras ◽  
Juan Mora
Keyword(s):  
High Power ◽  
Icp Oes ◽  
Spectral Interferences ◽  
Mip Oes ◽  
First Time

Common matrix-based non-spectral interferences are studied for the first time in high-power MIP-OES. The results are compared with those in ICP-OES.

Evaluation of three first-generation ion-selective electrode analyzers for lithium: systematic errors, frequency of random interferences, and recommendations based on comparison with flame atomic emission spectrometry

1990 ◽  
Vol 36 (1) ◽  
pp. 104-110 ◽  
Author(s):  
A O Okorodudu ◽  
R W Burnett ◽  
R B McComb ◽  
G N Bowers
Keyword(s):  
First Generation ◽  
Matrix Effects ◽  
Atomic Emission ◽  
Systematic Errors ◽  
Ion Selective Electrode ◽  
Atomic Emission Spectrometry ◽  
Emission Spectrometry ◽  
Analytical Problem ◽  
Selective Electrode ◽  
Performance Specifications

Abstract Ion-selective electrode analyzers for measuring lithium (Li/ISE) in serum became available in early 1987. We compared results for patients' samples from three of them vs results from flame atomic emission spectrometry (FAES). Within-run and day-to-day imprecision ranged from 0.01 to 0.03 mmol/L and 0.01 to 0.04 mmol/L, respectively. Comparing Li/ISE results (y) with the FAES results (x) gave the following equations: y = 1.063x - 0.035 for AMDEV's Lytening 2, y = 1.020x + 0.038 for NOVA's Model 11, and y = 1.030x - 0.027 for AVL's Model 985. Unexplained positive errors greater than 0.2 mmol/L were observed for two of the 90 patients' samples, but only a few additional excessively high values were seen in 3000 patients' samples run subsequently (Lytening 2). Causes of error in clinical Li/ISE measurements are still unclear; simply characterizing them as "matrix effects" does not correct the underlying analytical problem. An increase in pH from loss of CO2 gave low results on two of the three Li/ISE analyzers but did not change FAES results. Trimethylammonium bicarbonate used in a reconstitution solution caused extremely high Li/ISE results but did not change FAES results. Performance specifications to help reduce and correct these errors are recommended.

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