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Direct analysis bromine and iodine of dried serum spots by laser ablation‐Inductively coupled plasma mass spectrometry
摘要： Rationale: Accurate quantitative analysis of bromine and iodine in serum is an important aspect of monitoring body condition, but the volatile loss of halogen in sample pretreatment is troublesome problem. We present a validated and flexible high-throughput method for quantification of bromine and iodine in dried serum spots (DSS) using LA-ICP-MS and an external aqueous standard calibration curve. The influence of serum matrix and laser ablation conditions on analysis of bromine and iodine in DSS were researched systematically. Methods: Aqueous standards without matrix matching were used for calibration to analyze bromine and iodine in serum by LA-ICP-MS. 5-μL volumes of the aqueous standard solution and serum samples in 10 times diluted concentration were deposited on the PTFE paper to form dried standard calibration spots (DSCS) and DSS, with less than 2 mm in diameter. Laser ablation was performed using a focused Nd:YAG laser beam in raster lineal scan mode. Results: The limit of detection (LOD) for bromine and iodine in DSS were 0.23 and 0.03 mg L-1, respectively. The relative standard deviation (RSD) for this method was less than 10%. The samples were also detected with matrix matching calibration by ICP-MS. The accuracy of the method was verified by statistical analysis of these results from ICP -MS and LA-ICP-MS. The accuracy is satisfactory with recoveries range from 81.5 to 118%. Conclusions: A novel and simple approach for high-throughput screening of bromine and iodine in DSS screening analysis has been established by LA-ICP-MS. Calibration could achieved using aqueous standard solution instead of matrix matching solution. The method allowed analysis of low-volume biological samples without decomposition preparation and decreased the risk of contamination or loss.
关键词： Dried serum spots (DSS),iodine,LA-ICP-MS,bromine
更新于2025-09-16 10:30:52
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[IEEE 2019 International Electronics Symposium (IES) - Surabaya, Indonesia (2019.9.27-2019.9.28)] 2019 International Electronics Symposium (IES) - 2D Mapping and Localization using Laser Range Finder for Omnidirectional Mobile Robot
摘要： Simultaneous Localization and Mapping (SLAM) is a common technique to create the environment map and localize the robot position within the map. SLAM usually combines information from odometry and lidar sensor. However, odometry-based SLAM usually suffers accumulated errors due to wheel slipping. In this paper, we combined an omnidirectional-wheeled based floor odometry sensor and a 360o lidar sensor under Iterative Closest Point (ICP) SLAM platform. Our proposed technique can consistently reduce the errors caused by wheel slipping and refine the map.
关键词： omnidirectional mobile robot,lidar,SLAM,ICP,odometry
更新于2025-09-16 10:30:52
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[IEEE 2019 6th International Conference on Control, Decision and Information Technologies (CoDIT) - Paris, France (2019.4.23-2019.4.26)] 2019 6th International Conference on Control, Decision and Information Technologies (CoDIT) - 3D Mapping Based on Fusion of 2D Laser and IMU Data Acquired by Unmanned Aerial Vehicle
摘要： The paper deals with the three-dimensional (3D) modelling based on data acquired from 2D laser sensor and IMU (Inertial Measurement Unit) attached to the UAV (Unmanned Aerial Vehicle). The used multi-sensor unit produces 2D scans and provides information about Euler angles or quaternions. These angles are used to describe the UAV orientation in 3D space, more precisely the orientation of the laser sensor. In order to generate 3D occupancy map it is necessary to rotate the laser sensor around its axis yielding the 2D scans being mapped on 3D space using quaternions. Inertial sensor and Sweep LiDAR laser measurements are transmitted to the single board computer Odroid XU4 (SBC). The data fusion was performed under ROS (Robot Operating System) installed on the SBC, producing 3D space points. These points are transmitted over the network to the central computer on which the UAV localization and mapping processes are done within the ROS. The effectiveness of the proposed system for 3D modelling of the UAV environment is verified by experiment.
关键词： 2D laser,Octree,ICP,UAV,ROS,3D mapping,IMU,SLAM
更新于2025-09-16 10:30:52
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In situ sequential U-Pb age and Sm-Nd systematics measurement of natural LREE-enriched minerals using single laser ablation multi-collector inductively coupled plasma mass spectrometry
摘要： In the present work, we describe a sequential U-Pb and Sm-Nd systematics measurement from natural LREE-enriched minerals by using a Neptune Plus MC-ICP-MS coupled with a 193nm excimer laser in a single shot. The MC-ICP-MS is equipped with zoom optics lens to bring ion beams into the collector coincidently. The key features allow rapid switching between U-Pb and Sm-Nd collector configuration, which is applied to simultaneously measure the U-Pb age and Sm-Nd isotope of common natural LREE-enriched minerals. The robustness and usefulness of the present protocol is investigated by using a series of well-characterized mineral reference materials (monazite, titanite, perovskite) with known U-Pb and Sm-Nd isotopic values, which demonstrate its potential and versatility in geochemistry and microanalysis for cosmochemistry.
关键词： U-Pb age,LREE-enriched minerals,Sm-Nd isotope,laser ablation,MC-ICP-MS
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Meeting for Future of Electron Devices, Kansai (IMFEDK) - Kyoto, Japan (2019.11.14-2019.11.15)] 2019 IEEE International Meeting for Future of Electron Devices, Kansai (IMFEDK) - High reliability InGaZnO TFT by inductively coupled plasma sputtering system
摘要： The reliability of oxide semiconductor TFT and the method to lower the process temperature have become serious problems. In order to solve these problems, we have developed inductively coupled plasma sputtering equipment that can control the Radio Frequency (RF) power to generate Inductively Coupled Plasma (ICP) and the voltage applied to the sputtering target independently. Using this equipment, we can deposit high-density oxide semiconductor films at room temperature and fabricate highly reliable TFTs with them.
关键词： thin-film transistor(TFT),inductively coupled plasma (ICP) sputtering,InGaZnO (IGZO),reliability
更新于2025-09-16 10:30:52
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Direct Trace Element Determination in Oil and Gas Produced Waters with Inductively Coupled Plasmaa??Optical Emission Spectrometry: Advantages of High Salinity Tolerance
摘要： Waters co-produced during petroleum extraction are the largest waste streams from oil and gas development. Reuse or disposal of these waters is difficult due to their high salinities and the sheer volumes generated. Produced waters may also contain valuable mineral commodities. While an understanding of produced water trace element composition is required for evaluating the associated resource and waste potential of these materials, measuring trace elements in brines is challenging due to the dilution requirements of typical methods. Alternatively, inductively coupled plasma-optical emission spectrometry (ICP-OES) has shown promise as being capable of direct measurements of trace elements within produced waters with minimal dilution. Here we evaluate direct ICP-OES trace element quantification in produced waters for seventeen trace elements (As, Al, Ba, Be, Cd, Cr, Co, Cu, Hg, Mo, Ni, Pb, Rb, Sb, U, V and Zn) within fifteen produced waters from five U.S. continuous reservoirs. The total analytical uncertainties associated with the trace element levels determined using ICP-OES were estimated to be better than ± 30% (2s) except for Rb, which could not be determined due to ionisation interferences. The ICP-OES results are compared with trace element levels determined using inductively coupled plasma-mass spectrometry from the same samples. Our results demonstrate the potential for direct analysis of high salinity waters using ICP-OES with minimal dilution and provide trace element concentrations in waters from several important U.S. petroleum-generating reservoirs where available data are sparse.
关键词： ICP-OES,elemental analysis,hypersaline matrix,produced waters,unconventional oil and gas
更新于2025-09-16 10:30:52
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Mineral Constituents Profiling of Ready-To-Drink Nutritional Supplements by Inductively Coupled Plasma Optical Emission Spectrometry
摘要： Nutritional drinks (NDs) are medicinal food products intended for people with different health issues constricting nutrients provision. Eight varieties of milkshake style NDs were analyzed in this work. Prior to element analysis, they were freeze-dried, and concentrations of twenty macro- and microelements in analyzed samples were simultaneously measured by ICP-OES after their mineralization in a closed-vessel microwave-assisted digestion system. Results of this analysis indicated that these NDs must be considered as nutrient-dense foods, taking into account mineral constituents. Consumption of two bottles of such NDs per day provides very a high amount or even an excess of human daily requirements set as Recommended Dietary Allowances (RDAs). Generally, concentrations of determined elements in examined NDs were consistent with data given on the labels—most of differences did not exceed 30% (median: ?5.91%, standard deviation: 14%). Discovered very strong and moderate positive correlations between concentrations of major and essential elements (Ca, Mg, P, Cu, Fe, Mn, Zn) were likely due to their incorporation into formulations of analyzed NDs. However, relationships between contents of trace elements were the result of concomitance of these elements in substrates used for examined products production or contamination of substrates.
关键词： ICP-OES,interelement correlations,mineral constituents,lyophilization,freeze-drying,nutritional drinks,medical nutrition
更新于2025-09-16 10:30:52
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Shallow sampling by multi-shot laser ablation and its application within U-Pb zircon geochronology
摘要： The interaction of incident laser radiation and sample substrate is complex and difficult to predict. Natural zircons are often both structurally and chemically heterogeneous in 3-dimensional space. Encountering growth-related, structural micro-heterogeneities, inclusions and chemical complexities is almost inevitable during a static ablation of several tens of seconds. A multi-shot approach to laser ablation described here implements a minimal sample exposure time to incident laser radiation by applying multiple 1 Hz shots to a single sample location in delayed succession. This process can be conceptualised as a “slowing down” of a high-frequency (5-20 Hz) static laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis until each laser pulse is distinct albeit transient. The ability to integrate and collate signal pulses for a small number of consecutive laser shots, as opposed to continuously pulsing the laser, produces precise age determinations (~1% reproducibility, 2σ level) on small sample volumes (698 ± 22 μm3 on 91500 zircon standard). The multi-shot LA-ICP-MS protocol employed here significantly reduces the effect of ‘downhole’ fractionation as the resultant craters are extremely shallow (as shallow as 0.56 ± 0.02 μm on 91500 zircon standard) and maintain an aspect ratio of <<1. Further benefits include a reduced probability of thermally induced effects (e.g., substrate melting), plasma loading, and the potential for signal mixing (with depth) in a heterogeneous sample.
关键词： multi-shot LA-ICP-MS,depth resolution,LIEF,sub-micron sampling,downhole fractionation,Low sample volume
更新于2025-09-16 10:30:52
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Addressing K/L-edge overlap in elemental analysis from micro-X-ray fluorescence: bioimaging of tungsten and zinc in bone tissue using synchrotron radiation and laser ablation inductively coupled plasma mass spectrometry
摘要： Synchrotron radiation micro-X-ray fluorescence (SR-μXRF) is a powerful elemental mapping technique that has been used to map tungsten and zinc distribution in bone tissue. However, the heterogeneity of the bone samples along with overlap of the tungsten L-edge with the zinc K-edge signals complicates SR-μXRF data analysis, introduces minor artefacts into the resulting element maps, and decreases image sensitivity and resolution. To confirm and more carefully delineate these SR-μXRF results, we have employed laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to untangle the problem created by the K/L-edge overlap of the tungsten/zinc pair. While the overall elemental distribution results are consistent between the two techniques, LA-ICP-MS provides significantly higher sensitivity and image resolution compared with SR-μXRF measurements in bone. These improvements reveal tissue-specific distribution patterns of tungsten and zinc in bone, not observed using SR-μXRF. We conclude that probing elemental distribution in bone is best achieved using LA-ICP-MS, though SR-μXRF retains the advantage of being a non-destructive method with the capability of being paired with X-ray techniques, which determine speciation in situ. Since tungsten is an emerging contaminant recently found to accumulate in bone, accurately determining its distribution and speciation in situ is essential for directing toxicological studies and informing treatment regimes.
关键词： LA-ICP-MS,Overlap,X-ray spectroscopy (XPS | XRF | EDX),Analyte,Zinc,Tungsten
更新于2025-09-12 10:27:22
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Dual-mode detection of avian influenza virions (H9N2) by ICP-MS and fluorescence after quantum dot labeling with immuno-rolling circle amplification
摘要： Avian influenza virus (AIVs), hosted in poultry, are the pathogens of many poultry diseases and human infections, which bring huge losses to the poultry breeding industry and huge panic to society. Therefore, it is of great significance to establish accurate and sensitive detection methods for AIVs. In this work, a dual-mode detection method based on immuno-rolling circle amplification (immuno-RCA) and quantum dots (QDs) labeling for inductively coupled plasma mass spectrometry (ICP-MS) and fluorescence detection of H9N2 AIV was developed. The dual-mode detection of the QDs by ICP-MS and fluorescence is used to achieve mutual verification within the analysis results, thus improving the accuracy of the method. With the immuno-RCA, the sensitivity of the method was increased by two orders of magnitude. The limit of detection of the proposed method is 17 ng L-1 and 61 ng L-1, and the linear range of the proposed method is 0.05-5 ng mL-1 and 0.1-5 ng mL-1 with ICP-MS and fluorescence detection, respectively. The relative standard deviation (n=7) is 4.9% with ICP-MS detection and 3.1% with fluorescence detection. Furthermore, the proposed method was applied to the analysis of chicken serum samples, no significant different was found for two modes detection and the recoveries of the spiking experiments are acceptable, indicating that the method has good practical potential for real sample analysis.
关键词： ICP-MS,quantum dot,rolling circle amplification,H9N2 avian influenza virus,dual mode detection
更新于2025-09-12 10:27:22