Lab Science News - Science, chemistry and environmental news from laboratory experts

Vapor Intrusion Investigations: Air Sampling Tips for Meeting Data Quality Objectives

September 26th, 2011

N. Dagnillo1, L. Hill2, A. Fortune3, A. Smith4, and S. Thompson2
1Trihydro Corporation, 3001 E. Pershing Blvd, Suite 115, Cheyenne, WY 82007
2Trihydro Corporation, 1537 Riverside Ave., Suite 101, Fort Collins, CO 80524
3Columbia Analytical Services, Inc., 2655 Park Center Drive, Suite A, Simi Valley, CA 93065
4Trihydro Corporation, 9460 Calle Milano, Atascadero, CA 93422

Vapor intrusion is a fate and transport process characterized by the upward movement of volatile chemicals from subsurface contamination (e.g., buried waste, contaminated groundwater) into overlying buildings. The potential for adverse human health effects from exposure to indoor air vapors has motivated private, state, and federal entities to develop guidance documents and protocols specific to the collection and analysis of soil vapor data.

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Incremental Sampling Methodology

June 22nd, 2011

MIS2Incremental Sampling Methodology (ISM) is a technique designed to statistically reduce or limit variability associated with discrete sampling. It provides unbiased, representative and reproducible estimates of the mean concentration of analytes in a specific area of interest, called a “decision unit.”

Interest in (ISM) has grown in recent years largely because the approach, when applied correctly, can significantly reduce sampling uncertainty. This in turn can increase the probability that sample data is more representative of average site conditions at hazardous waste sites, thereby strengthening decision making at the site.

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Heavy Metals (USP<231>) Revisions

April 26th, 2011

New Limits and Procedures for Elemental Impurities in Pharmaceuticals and Dietary Supplements

ICP-MSBy Jeff Grindstaff and Colleen Schroeder

Changes to heavy metals test procedures for the analysis of pharmaceuticals and dietary supplements are under review with new standards set to be in place by mid-2013.4 The intention of the review is to update current analytical testing historically performed using United States Pharmacopeia (USP) <231>. The revisions (USP<232>, USP<233>, and USP<2232>) are designed to set safer limits for public exposure and to reduce the environmental impact of dated methods. Many in the pharmaceutical industry have concerns about the new instrumentation, more stringent requirements, and the associated costs. Nonetheless, the revisions should have a beneficial impact on the industry by significantly improving specificity and analyte recoveries, as well as by yielding overall time savings resulting in safer, higher quality products.

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Vapor Intrusion/Vapor Encroachment: ASTM’s New Standard Guide

February 28th, 2011

Vapor Intrusion in the HomeBy Steve Wing

On June 14, 2010, ASTM International (formerly the American Society for Testing and Materials) issued E 2600-10, Standard Guide for Vapor Encroachment Screening on Property Involved in Real Estate Transactions. This document revises and supersedes ASTM E 2600-08, Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate Transactions, issued on March 3, 2008.1

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Enhanced Monitoring for Hexavalent Chromium in Drinking Water

January 20th, 2011

Hexavalent Chromium in Drinking WaterIn response to a draft scientific review released in September 2010, the EPA has issued guidance to all public water systems (PWS) recommending enhanced monitoring and sampling programs specifically for hexavalent chromium [also known as chromium-6 or Cr(VI)] in drinking water.

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Saccharin Removed from EPA’s Hazardous Substance List

December 15th, 2010

SaccharinThe EPA has officially removed saccharin and its salts from their list of hazardous constituents and commercial chemical products. In a December 14, 2010 release, the EPA stated that saccharin is no longer considered a potential hazard to human health. Other substances on this list are still considered hazardous.

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Proposed plans for UCMR Program

December 6th, 2010

By Heidi Brayer

UCMR 3At an April 2010 stakeholder’s meeting, the EPA discussed proposed plans for the third phase of the Unregulated Contaminant Monitoring Regulation (UCMR) program. If approved, approximately 4,800 public water utilities will be required to monitor up to 30 contaminants starting in 2013.

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