钢中多元素检测方案(激光诱导击穿)

Introduction The J200 LIBS (Laser Induced Breakdown Spectroscopy)Instrument from Applied Spectra，Inc. provides simple but powerfulelemental analysis for a widerange of sample matrices. LIBSprovides great elemental coveragefrom H - Pu， including elementsthat are difficult or impossible bypopular elemental techniques，such as XRF， including non-metals (e.g. C， H， N， S， and O)and halogens (e.g. F). LIBS is astraightforward technique where most measurements are performed in an atmospheric environment without the need for a high vacuum， andLIBS can measure organic elements such as H， N， and O in a purged gas environment with Argon or Helium. For steel analysis， LIBS is ideal for rapid QC (quantitative analysis and detection of contaminants) for raw ma-terials in production， and to check the elemental composition of finished products. LIBS also offers the abilityto analyze slag samples that can lead to the recovery of precious metals lost in the steel production process. The complex emission lines in LIBS spectra correlate with elements in the steel samples. These can be eas-ily and accurately identified and labeled with Applied Spectra's TruLIBSTM Database. Additionally， using ASI'sadvanced calibration software， the user can easily make calibration curves for quantitative analysis. Si CQuantitative Analysis of SteelUsing Laser Induced Breakdown Spectroscopy (LIBS)Na 2of4LiHg Operating Parameters Applied Spectra Inc.’s J200 LIBS Instrument 1064nm Nd：YAG laser FlexTM sample chamber with gas flow Sample： Bureau of Analysed Samples Ltd. SteelStandards LIBS data analyzed using Applied Spectra Data AnalysisSoftware package Applied Spectra Inc.'s J200 LIBS Instrument Sample Analysis The J200 LIBS Instrument was used to analyze a set of stainless steel samples from the Bureau of AnalysedSamples Ltd. (10 standards： SS-CRM 401/2-410/2). These standards were used to evaluate the ability forLIBS to detect and quantify specific elements of interest (Figure 1). These elements include， but are not limited to C， P Cu， Mn， and Mo. Figure 1. Example LIBS spectrum from BAS CRM 404/2. Applied Spectra， Inc. The BAS CRMs were analyzed using the J200 LIBS Instrument equipped with a broadband CCD detectorthat gives spectral coverage from 190 to 1040 nm. Figure 1 shows a few zoomed-in spectral regions from thefull spectrum of the 404/2 BAS CRM's. Using ASI's data analysis package provides an advanced calibrationalgorithm that uses the entire LIBS spectra for performing the quantitative analysis of unknown steel samples.The advanced calibration model was built using 9 of the steel standards， while SRM BAS 404/2 was used asa test sample to determine the accuracy and precision of the model. Figure 2 displays the calibration curvesobtained for C， Si， P，and Mo. Figure 2. Calibration curves for C， Si， P， and Mo created using ASI’s advanced calibration model. Table 1 displays the results of using BAS 404/2 as sample to test the advanced calibration model. The accu-racy of the method was good (<10 %BIAS) and ranged from -5.7 to7.6%BIAS. The precision of the methodwas 1.9 -9.4 %RSD. The reference data from these BAS CRMs were determined using combustion， gravi-metric， ICP-OES， titration， and FAAS methods. BAS 404 C Si P Cr Mn Ni Cu Mo Reference Values (wt. %) 0.696 1.12 0.0479 0.774 0.532 0.393 0.427 0.307 Detected Value (wt. %) 0.702 1.16 0.0502 0.741 0.573 0.375 0.447 0.290 ± SD 0.093 0.08 0.0036 0.033 0.033 0.035 0.032 0.050 % RSD 4.5 7.3 7.2 4.5 5.8 9.4 7.1 1.9 % Bias 0.8 3.3 4.8 -4.3 7.6 -4.6 4.7 -5.7 Table 1. Accuracy and precision of the multivariate calibration method tested using the BAS 404 steel CRM. Conclusion ASI’s J200 LIBS Instrument provides a simple and elegant solution for simultaneous measurement of impor-tant elements in the steel samples that are sometimes difficult for more traditional methods such as XRF andArc/Spark OES. Applied Spectra， Inc.'s data analysis software package makes data processing simple for allskill levels of analysts. The accuracy displayed by this experiment is within 3-sigma of the reference valuesreported by Bureau of Analysed Samples Ltd. APPLIED SPECTRAwww.AppliedSpectra.comTransforming the way the world does chemistry APPLIEDSPECTRAFremont Blvd.Fremont， CA ransforming the way the world does chemistry Applied Spectra，Inc.的J200 LIBS（激光诱导击穿光谱仪）仪器为广泛的样品提供简单但强大的元素分析。LIBS在H – Pu中提供了很好的元素覆盖，包括XRF难以或不可能检测的元素，例如非金属（C，H，N，S和O）和卤素（例如F）。LIBS大多数测量是在大气环境下进行的，无需高真空，并且LIBS可以在氩气或氦气的净化气体环境中测量有机元素，如H，N和O.使用BAS 404钢CRM测试了多变量校准方法的准确性和精密度。