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NHEXAS PHASE I REGION 5 STUDY--STANDARD OPERATING PROCEDURE FOR THE HYDRO 'PICOSYSTEM PLUS' ULTRAPURE WATER SYSTEM (NHX/SOP-300-009)
WARNING! DATA USE RESTRICTIONS
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The EPA does all it can to ensure that the identity of survey participants cannot be disclosed. All direct identifiers, as well as any characteristics that might lead to identifications, are omitted from the data. Any intentional identification or disclosure of a person or establishment violates the assurances of confidentiality given to the providers of the information. Therefore, users will (1) use the data in this study for statistical reporting and analysis only; (2) make no use of the identity of any person or establishment discovered inadvertently and will advise the HEDS Administrator of any such discovery; (3) will not link this data with individually identifiable data from other EPA or non-EPA data.
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Citation:
Region 5 Study Consortium. NHEXAS PHASE I REGION 5 STUDY--STANDARD OPERATING PROCEDURE FOR THE HYDRO 'PICOSYSTEM PLUS' ULTRAPURE WATER SYSTEM (NHX/SOP-300-009). U.S. Environmental Protection Agency, Washington, D.C., 1995.
Description:
This procedure describes the operation and maintenance of the Hydro Picosystem Plus ultrapure water system. Ultrapure water is essential in many laboratory processes from sample preparation to final analysis. The system consists of four primary purification steps. A coarse pre-filter is designed to remove particles larger than 0.5 m and a fine pre-filter is to remove particles larger than 0.2 m. An activated carbon tank is incorporated to remove organics and chlorine. Two ion exchange resin tanks remove dissolved solids and other ionic species. Finally, the UV sterilizer unit is designed to destroy most water-borne pathogens. The system is designed to deliver 18 M , bacteria free water with total organic content less than 10 ppb and background levels of metals at parts per trillion range. Keywords: ultrapure water.
The National Human Exposure Assessment Survey (NHEXAS) is a federal interagency research effort coordinated by the Environmental Protection Agency (EPA), Office of Research and Development (ORD). Phase I consists of demonstration/scoping studies using probability-based sampling designs. The Region 5 study was conducted in EPA's Region 5 (Ohio, Michigan, Illinois, Indiana, Wisconsin, and Minnesota), and included personal exposure, residential concentration, and biomarker measurements of metals and VOCs. The study was conducted by the Research Triangle Institute (RTI) and the Environmental and Occupational Health Sciences Institute (EOHSI). The scope and design of the study are detailed in the following article: E. Pellizzari et al., Population-Based Exposure Measurements in EPA Region 5: A Phase I Field Study in Support of the National Human Exposure Assessment Survey. Journal of Exposure Analysis and Environmental Epidemiology, Vol. 5, No. 3, 1995, pp. 327-358.
NOTE: The U.S. Environmental Protection Agency (EPA), through its Office of Research and Development (ORD), partially funded and collaborated in the research described here. Mention of trade names or commercial products does not constitute endorsement or recommendation by EPA for use. This SOP is part of the Quality Systems Implementation Plan (QSIP) that was reviewed by the EPA and approved for use in this demonstration/scoping study. This SOP was used in the study and is provided for documentation purposes. It does not reflect EPA methods and should not be construed as such. The methods were generated by the consortium to be used for the NHEXAS pilot study.