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Spectrace 9000 Field Portable Xrf Analyzer

  • Spectrace 9000 Field Portable Xrf Analyzer
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Product Description


The TN 9000 is a commercially available instrument that can use up to three radioactive sources and a mercuric iodide semiconductor detector for the analysis of metals in soil. It is field portable, weighing less than 20 pounds, and can be battery powered for up to 8 hours. For this demonstration, the TN 9000’s Soils Application software was configured to report concentrations for chromium, iron, nickel, copper, zinc, arsenic, lead, cadmium, antimony, and barium. Contaminant concentrations are computed using a fundamental parameters (FP) calibrated algorithm included in the analyzer’s operations software. The FP calibration does not require site-specific calibration standards.
The performance characteristics of the TN 9000 include the following:
  • Detection limits: Precision-based detection limits were determined by collecting 10 replicate measurements on site-specific soil samples with metals concentrations 2 to 5 times the expected MDLs. The results were 100 milligrams per kilogram (mg/kg) or less for all of the reported analytes except chromium, which was determined to be 200 mg/kg using the Fe55 source and 500 mg/kg using the Cd109 source which was used for the otherreported analytes. Values for iron and cadmium were not reported due to an insufficient number of samples in the required concentration range.
  • Throughput: Average throughput was 8.5 to 10.5 analyses per hour using a source count time of 220 seconds. This rate only represents the analysis time, since different personnel were used to prepare the samples.
  • Drift: This was evaluated using the results of a daily analysis of an SRM which contained quantifiable levels of arsenic, barium, copper, lead, and zinc. Over the 18 days of the demonstration, the RSD values for the mean recovery of barium, copper, lead, and zinc were all less than 8 percent. The corresponding value for arsenic was 18.2 percent.
  • Completeness: The TN 9000 produced results for 1,259 of the 1,260 samples analyzed, resulting in a completeness of 99.9 percent. The remaining sample was lost due to operator error in transferring the data.
  • Blank results: During the demonstration, 37 blank samples were analyzed. None of the reported primary analytes were detected above the method detection limits. However, iron frequently reported a value above the MDL after analyzing samples with an iron concentration of greater than 20,000 mg/kg.
  • Precision: The goal of the demonstration was to achieve relative standard deviations (RSD) less than 20 percent at analyte concentrations of 5 to 10 times the method detection limit. The RSD values for antimony, arsenic, barium, copper, lead, and zinc were less than 8 percent. The corresponding value for chromium was 22 percent. Values for cadmium, iron, and nickel were not reported because too few samples containing the required concentrations were measured.  Accuracy: Intramethod accuracy was assessed using site-specific soil PE samples and soil SRMs. The data showed that 37 of 41 or 90.2 percent of the PE sample analytes had recoveries within the quantitative acceptance range of 80 - 120 percent. A corresponding 22 of 24 or 91.7 percent of the SRM analytes were within the 80 - 120 percent recovery range. The TN 9000 gave more accurate results when the reference sample closely matched the matrix used to set the fundamental parameters calibration for the analyzer.
  • Comparability: This demonstration showed that the TN 9000 produced data that exhibited a log10-log10 linear correlation to the reference data. The coefficient of determination (r2) which is a measure of the degree ofcorrelation between the reference and field data was 0.95 for arsenic, 0.95 for copper, 0.96 for lead, 0.93 for zinc, 0.79 for barium, and 0.78 for chromium. Results for iron, nickel, cadmium, and antimony were not reported due to limited sample data.
  • Data quality levels: Using the demonstration derived precision RSD results and the coefficient of determination as the primary qualifiers, the TN 9000 produced definitive level data for arsenic, copper, lead, and zinc; quantitative level data for barium; and data of qualitative screening level for chromium. Values for iron, nickel, cadmium, and antimony could not be assigned without adequate precision or comparability data.
The results of the demonstration show that the Spectrace TN 9000 can provide useful, cost-effective data for environmental problem-solving and decision-making. Undoubtedly, it will be employed in a variety of applications, ranging from serving as a complement to data generated in a fixed analytical laboratory to generating data that will stand alone in the decision-making process. As with any technology selection, the user must determine what is appropriate for the application and the project data quality objectives.



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