Department of Geology
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TRACE ELEMENT ANALYTICAL LABORATORY

The Trace Element Analytical Laboratory, operated by the Department of Geology and located in Cramer Hall Room 43, provides inorganic analytical support for researchers from throughout PSU as well as non-PSU users.

Instrumentation

 

User Fees

 

ICP-MS Applications

 

Examples of Recent

ICP-MS Research

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Environmental Sciences & Resources Graduate Student

Becky Gloss operating the HP-4500 Inductively Coupled Plasma Mass Spectrometer

 

Geology Graduate Student Eric Nielsen operating the

Dionex ICS-2500 Ion Chomatograph

 

For inquires regarding analytical capabilities, sample preparation, or scheduling and pricing, contact Ben Perkins:

Telephone: (503) 725-3387
Fax: (503) 725-3025
email: rperkins@pdx.edu

Mailing Address
Portland State University 
Department of Geology
Cramer Hall 17
P.O. Box 751
Portland, OR 97207-0751
 

FedEx / UPS Street Address
Portland State University 
Department of Geology 
Cramer Hall 17
1721 SW Broadway 
Portland, OR 97201

The lab houses the following instrumentation:

Laboratory Fee Schedule:

ICP-MS Applications:

ICP-MS can generate high-quality trace-level (sub-ppm) concentration data for elements with a wide range of atomic masses from 6Li to 238U. The best results are obtained for elements that have ionization potentials well below that of the carrier gas (Ar, 15.8 eV) and that are free of isobaric interferences. Our current setup precludes analyzing anything other than solutions. Analyses of soils, rocks, and other solids thus requires that samples be dissolved (e.g., via strong acid digestion). Solution samples submitted for analysis should be free of solids and elevated concentrations of organic compounds. Ideally, they should be in a matrix of 1-3% HNO3. Other matrices, including HCl, may be problematic in terms of signal response (e.g., viscosity differences affecting nebulization efficiencies, matrix components affecting plasma chemistry or inducing space charge effects) and interferences (e.g., Cl can combine with other elements in the atmosphere (including Ar!) or in solution to form dimers or trimers that cause interferences when analyzing As (in particular), Cr, Co, & Cu, amongst other analytes of interest). For these reasons, accurate analyses of solutions that are not in a dilute HNO3 matrix require matrix matching with standards and or use of standard addition calibration. Reagents used for sample preparation should be doubly distilled or ultrapure where possible. Samples that have high concentrations (> ppm) of analytes should be diluted. A minimum of 10 ml should be submitted for analysis.

 

Users need to provide:

Standards: Ideally these will be prepared from single- or multi-element commercial stock solutions. Typically, we utilize 3 to 6 external standards that bracket expected sample concentration range. In addition, we recommend that internal standards be utilized to account for variations in instrumental response as the analysis proceeds (drift). Internal standards (IS) are elements (e.g., Y, In, Bi) that would have negligible concentrations in sample and that do not cause isobaric interferences with analytes; they are added to all blanks, standards, and samples and the analyte:IS ratio is used to calibrate.

 

Blanks: Procedural blanks should be prepared by the same method used to prepare the unknowns. If the unknowns have not been processed by any digestion method, the blank would be diluted acid similar in concentration and character to that in the unknowns. Blanks will be run initially to check the cleanness of sample preparation procedures.

 

Quality Control Samples: These are samples of known concentrations, but prepared separately from (ideally with different stocks and by different people) calibration standards and are used to check the accuracy of the calibration and to track instrumental drift. Commercial QC samples are available.

Recent & Current ICP-MS Academic Research Users

Program / Department

PI

User

Project

PSU Geology

Perkins

Perkins GrayMS HackettMS-IP WagnerMS-IP ColeST, MS-IP G448/548 Class

Various;                                                                             Synthesis &  Characterization of Iron Films                Sourcing Groundwater Springs                                   Sourcing Groundwater Springs                                        Metal Uptake in Infiltration Galleries                                    Metal Uptake in a Constructed Wetland                               Heavy Metals in Local Waters & Sediments                           Recon of As in Local Groundwater

PSU Geology

Cummings

NielsenMS JamesMS  SheridanMS BartruffMS-IP Students

Coastal Surface Water                                                 Groundwater Hydrogeology of Williamson R. Basin Groundwater-River Interaction in North Fork John Day River, Origins of Tufa in S Central OR Role of Pumice in Landscape Development

PSU Geology

Streck

G442/542 class

Trace elements in volcanic rocks

PSU Geology

Cady

ParenteauDD

Microbial Signatures in Hot Springs

PSU Geology

Burns

BarnhardDD-IP RyanMS-IP G460/560

Terroir Geochemistry Background                                        As Concentrations in OR Soils Various Project

PSU Geology

Peterson

Student Students

Characterization of Paleosol Aquitards in Coastal Dune Deposits                                                                              Sourcing Archaeological Artifacts

PSU Geology

Grathoff

EasterlyMS

Characterization of Natíl Iron Films

PSU Engineering/ESM

Fish

MukomeDD SmithDD-IP          Sinha

Cd Release from Fertilizers                                             Contaminant Transport, Portland Harbor Superfund Site Metal Sorption Study

PSU Engineering

Johnson

Shehzrad ParajuliDD-IP Scherberg

Cd Adsorption                                                              Contaminant Transport                                                   Efficacy of Passive As Treatment Sys.

PSU ESM

Sytsma

MillerMS

Lake Characterization

PSU ESM

Yeakley

GlossMS

Heavy Metals in Johnson Creek

PSU Biology

Popa

Students

Microbial Weathering of Olivine

PSU Biology

Stedman

Student

Viruses in Acidic Volcanic Lake

PSU Chemistry

Iwata-Reuyl

BonnetMS

Prokaryotic Cyclohydrolase I Study

PSU Physics

Seipel

Student

Metal Doping of Magnetic Superconductors

OSHU/School of Dentistry

Mitchell

Davis              ClarkDD        Brown

Metals Leaching from Dental Work

OSHU/Microbiology

Landfear

Sanchez

As in Biologic Samples

OHSU/Microbiology

Crosa

Student

Analysis of Experimental Solutions

OSHU/Physiology & Pharmocology

Dawson

Student

Metals Leaching from Tygon Tubing

Note: ST: Senior thesis project; MS: Masters thesis project; MS-IP: Masters thesis project in progress; DD: Doctoral dissertation project; DD-IP: dissertation project in progress