| Event Date: | Event Information: | Event Location: |
| 01/01/2005 | PRESENTATION
Title: Calcium Supplements
Presentor: Nimi Kocherlatkota
Description: Do you want to know what is in your calcium suppliments? Review our presentation to find out what we discovered. | Metuchen, NJ |
| 01/01/2005 | PRESENTATION
Title: Stat. Determination of Uncertainties Associated w/Certified Values of Ion Chromatography Ref. Mat.
Presentor: Dr. Ralph Obenauf and Nimi Kocherlakota
Description: Determine the statistical uncertainty associated with the measurement of the concentration of SPEX CertiPrep Fluoride RM, prepared to give a target value of 1,000 mg/L.
Certified value: 995 ± 5 mg/L
The 5 mg/L represents the uncertainty associated with the certified value.
Click here to view presentation | None at this time |
| 01/01/2005 | PRESENTATION
Title: Measurement Uncertainty Its NELAC How Do You Approach It
Presentor: Nimi Kocherlakota
Description: Measurements are made to:
· Accept or reject a product
· Determine if an instrument is running properly
· Assess the value of a product or service
There is always some unknown error associated with every measurement. The quantity of this unknown error can be defined as measurement uncertainty.
To determine the quality of a measured value an estimate of measurement uncertainty, which determines the confidence of measurement must be given.
Click here to view presentation | None at this time |
| 01/01/2005 | PRESENTATION
Title: Determination of Trace Elements in Drinking Water by ICPMS
Presentor: Nimi Kocherlakota, Laslo Eenyei, Ralph H. Obenauf
Description: Objective of the Study
What is in the water that you drink?
Water samples were collected from various states ranging from Arizona to Virginia. Trace metals were determined by ICPMS and Major elements by ICP. Hardness, Fluoride and other anions were also determined.
Click here to view presentation | None at this time |
| 03/13/2006 | PRESENTATION
Title: calibration Strategies and Dilution Practices
Presentor: Bill Hahn, Vice President, Protocol Analytical, LLC.
Description: This presentation convers good strategies for analytical calibrations focusing on chromatographic techniques.
Discussed in detail are the uncertainties involved in various dilution practices, as well as a method of calculating uncertainties for USEPA Method 8270.
| 2006 Pittsburgh Conference - CRMMA Symposium |
| 05/01/2005 | PRESENTATION
Title: Problematic Analytes in Environmental Analysis
Presentor: William H. Hahn, Jr.
Description: An open forum for the exchange of specific working knowledge of organic compounds and thier idiosyncracies. Volatile Organics and pH dependency, polymers, dimers and trimers. Flow rates, analytes that decompose within the system and proficiency testing ramifications. Semivolatile Organics and pH dependency, phenols and recoveries, Benzidines and analytical challenges. Pesticides and Herbicides and their breakdown products, esters and anisoles, hydrolizing steps and much more.
Click here to view presentation | Florida State Environmental Analysts |
| 05/01/2005 | PRESENTATION
Title: Analytical Uncertainty
Presentor: William H. Hahn, Jr.
Description:
All analytical measurements have an associated uncertainty. All lab techniques have an associated uncertainty. We wish to promote good laboratory practices and reduce the errors at the bench as well as the regulatory level. Our goal is to show calculations, uncertainties and lab practices that will help chemists and regulators have a better understanding of analytical measurements and their limitations.
Click here to view presentation | Florida State Environmental Analysts |
| 05/24/2005 | PRESENTATION
Title: Common Problems Encountered When Running Performance Testing Samples for Laboratory Accreditation
Presentor: Nimi Kocherlakota, Ralph Obenauf
Description: *Performance Evaluation (PE) program, operated by USEPA, was privatized under NELAP as the Performance Testing (PT) Program.
*PT samples are available from PT providers, accredited in specific areas by NVLAP.
*One or two PT’s per year depending on programs.
*We will discuss common pitfalls and problems, which have caused failure for inorganic analytes, and ways to avoid them.
Click here for presentation | None scheduled at this time |
| 05/24/2005 | PRESENTATION
Title: Manufacturing, Quality Control and Characterization of SPEX CertiPrep Isotope Standards
Presentor: Nimi Kocherlakota, Ralph Obenauf, Laslo Ernyei
Description: Why use Isotope Standards?
For the quantification of trace elements by ICPMS, using isotope dilution techniques has a number of advantages: provides high sensitivity, high accuracy, and it is easy and simple when compared to thermal/surface ioniztion mass spectrometry.
Click here to view presentation | None Scheduled at this time |
| 05/24/2005 | PRESENTATION
Title: Quantification of Measurement Uncertainties of Reference Materials by SPEX CertiPrep
Presentor: Ralph Obenauf, Nimi Kocherlakota
Description: An evaluation of the total combined uncertainties of a reference material manufactured by SPEX CertiPrep is provided in the presentation below. Erbium, prepared to give a target value of 1000 mg/L is chosen as an example. High purity Erbium Oxide (Er2O3) which was assayed for Erbium by EDTA titration and trace impurities determined by ICP/ICPMS, was weighed accurately and then dissolved in high pure nitric acid. Erbium concentration in the solution was determined first by wet assay and then by ICP.
Please review the presentation below for more information.
Click here to view presentation | None scheduled at this time |
| 05/24/2005 | PRESENTATION
Title: Implementation of The Performance Testing Program Under NELAC - The SPEX CertiPrep Solution
Presentor: Ralph Obenauf, Vanaja Sivakumar
Description: SPEX CertiPrep Manufactures PT Samples with Years of Experience in this Market.
·Manufactured and distributed CRMs for Over 45 Years
· USEPA CRADA Partner for QC Samples Beginning in 1991
· Supplied QC Samples (Mirror PT Samples) for 10 Years
· Well Defined, ISO 9001 Quality System Accredited by UL Since 1994
· Leader in Traceability and Certification
· Technically Qualified, Skilled Personnel
· World-Wide Distribution System
Click here to view presentation | None scheduled at this time |
| 05/24/2005 | PRESENTATION
Title: Proficiency Testing of Environmental Laboratories
Presentor: William H. Hahn, Jr.
Description:
The EPA has successfully transferred the PT program to the private sector. This presentation explains the PT providers role and methods as well as some perspectives on PTs and the USEPA PT program specifically.
Click here to view presentation | None at this time |
| 05/24/2005 | PRESENTATION
Title: Calibration Strategies and Dilution Practices
Presentor: William H. Hahn, Jr.
Description:
We have observed over the years that chemists use a variety of techniques to dilute solutions and calibrate instruments. We have also observed that many techniques in common practice contain an unacceptable amount of error and uncertainty. We wish to promote good laboratory practices and reduce the errors at the bench. The goal is to show calculations, uncertainties and lab practices that will help chemists make better measurements, or understand why they do so well.
Click here to view presentation | None at this time |
| 08/01/2005 | PRESENTATION
Title: Trace Metals in Chocolate
Presentor: Nimi Kocherlakota
Description: This presentation is informative for both the lover of chocolate as well as the curious scientist. After months of testing chocolates from around the world, we found out that chocolate may have a lot more in it than the rich, smooth taste we have all grown to love. | Good Laboratory Practices Seminar, Charlottesville, VA |
| 08/01/2005 | PRESENTATION
Title: Quantitative Calculation of the Statistical Uncertainty Associated with a Gold Reference Material
Presentor: Ralph Obenauf, Ph.D.
Description: | Measurement Uncertainty Symposium, Washington, DC |
| 09/28/2005 | PRESENTATION
Title: Clean Laboratory Technical Tips
Presentor: Ralph Obenauf, Ph.D.
Description:
| JAM Annual Meeting, VA |
| 10/19/2005 | PRESENTATION
Title: PPB/PPT Analysis
Presentor: Nimi Kocherlakota
Description: More details to come. | US EPA, TX |
