Gradient

Senior Scientists

A. Patricia Tcaciuc, Ph.D.
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Education

Ph.D., Environmental Chemistry and Geochemistry, MIT-WHOI Joint Program in Chemical Oceanography

B.S., Chemistry, Environmental Engineering Science, MIT

Expertise

  • Environmental Forensics
  • Chemical Fingerprinting
  • Organic Geochemistry
  • Chemical Registrations
  • Read-Across Assessment
  • Passive Sampling
  • Chemical Oceanography

    A. Patricia Tcaciuc, Ph.D.

    Senior Environmental Chemist

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    Dr. Tcaciuc is an environmental chemist with extensive experience in characterizing organic pollutants in environmental media. At Gradient, she uses her knowledge of chemistry and geochemistry for projects involving chemical compliance, chemical registration, read-across evaluations, data quality review, and chemical fingerprinting for cost allocation and litigation support.

    Her doctoral research focused on using passive samplers to investigate bioavailability, toxicity, and reactivity of hydrophobic organic chemicals, such as PCBs, PAHs, and DDTs. This research combined field deployment and chemical analysis of passive samplers with development of diffusion models that aided in the data interpretation.

    Education

    Ph.D., Environmental Chemistry and Geochemistry, MIT-WHOI Joint Program in Chemical Oceanography

    B.S., Chemistry, Environmental Engineering Science, MIT

    Expertise

    • Environmental Forensics
    • Chemical Fingerprinting
    • Organic Geochemistry
    • Chemical Registrations
    • Read-Across Assessment
    • Passive Sampling
    • Chemical Oceanography

      Representative Projects

      PCB Method and Data Quality Evaluation: Evaluated analytical method suitability and data quality of PCB analyses in soil and vegetation samples that were collected post cleanup at a PCB-contaminated site.

      Chemical Registration: Reviewed data and determined chemical compliance needs in Japan and Thailand. Coordinated preparation of dossiers for notification under CSCL and ISHL laws in Japan for several substances. Managed production of deliverables for regulatory submissions.

      PAH Sediment Forensics at Superfund Site: Performed PAH forensic analysis on a large sediment dataset in support of a cost allocation model at a Superfund site with complex contamination history. Conducted literature review on signatures of different coal tars and employed double ratio analyses of parent and alkylated PAHs to distinguish contributions of site-specific sources.

      Forensics of Natural Gas Liquids: Performed forensic analysis of hydrocarbons in fugitive NAPL to evaluate claims of recent spills at a former natural gas processing plant. Implemented principal component analysis using PIANO data to evaluate homogeneity of NAPL and support source identification.

      PCB Forensics: Conducted literature review and forensic data analysis in support of PCB source identification. Contributed to methodology for quantification of PCB sources. Performed data analysis to visualize temporal and spatial trends for PCBs and other contaminants in various media.

      Radioactivity and BTEX in Hydraulic Fracturing Solid Waste: Conducted literature review and summarized available data for evaluating radioactivity and BTEX levels in hydraulic fracturing solid wastes.

      Read-across Chemical Evaluation: Identified suitable chemical surrogates in support of hazard assessments of chemicals without readily available toxicity data.

      Selected Publications

      Tcaciuc, AP; Borrelli, R; Zaninetta, LM; Gschwend, PM.  2018. "Passive sampling of DDT, DDE and DDD in sediments: Accounting for degradation processes with reaction-diffusion modeling." Environ. Sci. Process. Impacts

      Borrelli, R; Tcaciuc, AP; Verginelli, I; Baciocchi, R; Cesti, P; Zaninetta, L; Gschwend, PM.  2018. "Performance of passive sampling with low-density polyethylene membranes for the estimation of freely dissolved DDx concentrations in lake environments." Chemosphere 200 : 227-236.

      Tcaciuc, AP; Apell, JN; Gschwend, PM.  2015. "Modeling the transport of organic chemicals between polyethylene passive samplers and water in finite and infinite bath conditions." Environ. Toxicol. Chem.

      Apell, JN; Tcaciuc, AP; Gschwend, PM.  2015. "Understanding the rates of nonpolar organic chemical accumulation into passive samplers deployed in the environment: Guidance for passive sampler deployments." Integr. Environ. Assess. Manag.

      See All Patricia Tcaciuc Publications